2.4.0.82416402 - Disclosure - Fair Value Measurements - Assets measured (Details)truefalsefalse1false USDfalsefalse$I2013Q3http://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$I2012Q4http://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDtruefalse$D2012Q3_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_mu_TransformMemberhttp://www.sec.gov/CIK0000723125duration2012-03-02T00:00:002012-05-31T00:00:00falsefalseTransform [Member]us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisxbrldihttp://xbrl.org/2006/xbrldimu_TransformMemberus-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDtruefalse$I2013Q3_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5false USDtruefalse$I2012Q4_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_MoneyMarketFundsMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseMoney market funds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MoneyMarketFundsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$7false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_MoneyMarketFundsMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseMoney market funds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MoneyMarketFundsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseCommercial paper [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$9false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseCommercial paper [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CertificatesOfDepositMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseCertificates of deposit [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CertificatesOfDepositMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$11false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CertificatesOfDepositMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseCertificates of deposit [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CertificatesOfDepositMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$12false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_SovereignDebtMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseGovernment securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SovereignDebtMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$13false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_SovereignDebtMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseGovernment securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SovereignDebtMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$14false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CorporateDebtSecuritiesMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseCorporate bonds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CorporateDebtSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$15false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CorporateDebtSecuritiesMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseCorporate bonds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CorporateDebtSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$16false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseCommercial Paper, Not Included with Cash and Cash Equivalents [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$17false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseCommercial Paper, Not Included with Cash and Cash Equivalents [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$18false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_AssetBackedSecuritiesMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseAsset-backed securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AssetBackedSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$19false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_AssetBackedSecuritiesMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseAsset-backed securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AssetBackedSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$20false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_EquitySecuritiesMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseMarketable equity securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$21false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_EquitySecuritiesMember_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseMarketable equity securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$22false USDtruefalse$I2013Q3_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$23false USDtruefalse$I2012Q4_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$24false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_MoneyMarketFundsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMoney market funds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MoneyMarketFundsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$25false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_MoneyMarketFundsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMoney market funds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MoneyMarketFundsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$26false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial paper [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$27false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial paper [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$28false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CertificatesOfDepositMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCertificates of deposit [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CertificatesOfDepositMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$29false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CertificatesOfDepositMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCertificates of deposit [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CertificatesOfDepositMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$30false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_SovereignDebtMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseGovernment securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SovereignDebtMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$31false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_SovereignDebtMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseGovernment securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SovereignDebtMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$32false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CorporateDebtSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCorporate bonds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CorporateDebtSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$33false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CorporateDebtSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCorporate bonds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CorporateDebtSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$34false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial Paper, Not Included with Cash and Cash Equivalents [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$35false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial Paper, Not Included with Cash and Cash Equivalents [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$36false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_AssetBackedSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseAsset-backed securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AssetBackedSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$37false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_AssetBackedSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseAsset-backed securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AssetBackedSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$38false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_EquitySecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMarketable equity securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$39false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_EquitySecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 1 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMarketable equity securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$40false USDtruefalse$I2013Q3_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$41false USDtruefalse$I2012Q4_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$42false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_MoneyMarketFundsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMoney market funds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MoneyMarketFundsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$43false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_MoneyMarketFundsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMoney market funds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MoneyMarketFundsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$44false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial paper [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$45false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial paper [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$46false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CertificatesOfDepositMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCertificates of deposit [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CertificatesOfDepositMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$47false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CertificatesOfDepositMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCertificates of deposit [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CertificatesOfDepositMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$48false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_SovereignDebtMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseGovernment securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SovereignDebtMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$49false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_SovereignDebtMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseGovernment securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SovereignDebtMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$50false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CorporateDebtSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCorporate bonds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CorporateDebtSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$51false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CorporateDebtSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCorporate bonds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CorporateDebtSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$52false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial Paper, Not Included with Cash and Cash Equivalents [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$53false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial Paper, Not Included with Cash and Cash Equivalents [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$54false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_AssetBackedSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseAsset-backed securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AssetBackedSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$55false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_AssetBackedSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseAsset-backed securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AssetBackedSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$56false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_EquitySecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMarketable equity securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$57false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_EquitySecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel2Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 2 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMarketable equity securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$58false USDtruefalse$I2013Q3_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$59false USDtruefalse$I2012Q4_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$60false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_MoneyMarketFundsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMoney market funds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MoneyMarketFundsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$61false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_MoneyMarketFundsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMoney market funds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MoneyMarketFundsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$62false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial paper [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$63false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial paper [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$64false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CertificatesOfDepositMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCertificates of deposit [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CertificatesOfDepositMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$65false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CertificatesOfDepositMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCertificates of deposit [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CertificatesOfDepositMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$66false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_SovereignDebtMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseGovernment securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SovereignDebtMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$67false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_SovereignDebtMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseGovernment securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_SovereignDebtMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$68false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CorporateDebtSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCorporate bonds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CorporateDebtSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$69false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CorporateDebtSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCorporate bonds [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CorporateDebtSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$70false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial Paper, Not Included with Cash and Cash Equivalents [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$71false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseCommercial Paper, Not Included with Cash and Cash Equivalents [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$72false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_AssetBackedSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseAsset-backed securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AssetBackedSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$73false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_AssetBackedSecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseAsset-backed securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AssetBackedSecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$74false USDtruefalse$I2013Q3_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_EquitySecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2013-05-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMarketable equity securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$75false USDtruefalse$I2012Q4_us-gaap_EligibleItemOrGroupForFairValueOptionAxis_us-gaap_EquitySecuritiesMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel3Member_us-gaap_FairValueByMeasurementFrequencyAxis_us-gaap_FairValueMeasurementsRecurringMemberhttp://www.sec.gov/CIK0000723125instant2012-08-30T00:00:000001-01-01T00:00:00falsefalseLevel 3 [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseMarketable equity securities [Member]us-gaap_EligibleItemOrGroupForFairValueOptionAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_EligibleItemOrGroupForFairValueOptionAxisexplicitMemberfalsefalseFair Value, Measurements, Recurring [Member]us-gaap_FairValueByMeasurementFrequencyAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueMeasurementsRecurringMemberus-gaap_FairValueByMeasurementFrequencyAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22falsefalsefalse00falsefalsefalse23falsefalsefalse00falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30falsefalsefalse00falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalse37falsefalsefalse00falsefalsefalse38falsefalsefalse00falsefalsefalse39falsefalsefalse00falsefalsefalse40falsefalsefalse00falsefalsefalse41falsefalsefalse00falsefalsefalse42falsefalsefalse00falsefalsefalse43falsefalsefalse00falsefalsefalse44falsefalsefalse00falsefalsefalse45falsefalsefalse00falsefalsefalse46falsefalsefalse00falsefalsefalse47falsefalsefalse00falsefalsefalse48falsefalsefalse00falsefalsefalse49falsefalsefalse00falsefalsefalse50falsefalsefalse00falsefalsefalse51falsefalsefalse00falsefalsefalse52falsefalsefalse00falsefalsefalse53falsefalsefalse00falsefalsefalse54falsefalsefalse00falsefalsefalse55falsefalsefalse00falsefalsefalse56falsefalsefalse00falsefalsefalse57falsefalsefalse00falsefalsefalse58falsefalsefalse00falsefalsefalse59falsefalsefalse00falsefalsefalse60falsefalsefalse00falsefalsefalse61falsefalsefalse00falsefalsefalse62falsefalsefalse00falsefalsefalse63falsefalsefalse00falsefalsefalse64falsefalsefalse00falsefalsefalse65falsefalsefalse00falsefalsefalse66falsefalsefalse00falsefalsefalse67falsefalsefalse00falsefalsefalse68falsefalsefalse00falsefalsefalse69falsefalsefalse00falsefalsefalse70falsefalsefalse00falsefalsefalse71falsefalsefalse00falsefalsefalse72falsefalsefalse00falsefalsefalse73falsefalsefalse00falsefalsefalse74falsefalsefalse00falsefalsefalse75falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]2false 4us-gaap_CashAndCashEquivalentsFairValueDisclosureus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse21040000002104000000USD$falsetruefalse5truefalsefalse22200000002220000000USD$falsetruefalse6truefalsefalse20180000002018000000USD$falsetruefalse7truefalsefalse21590000002159000000USD$falsetruefalse8truefalsefalse5400000054000000USD$falsetruefalse9truefalsefalse2900000029000000USD$falsetruefalse10truefalsefalse3200000032000000USD$falsetruefalse11truefalsefalse2700000027000000USD$falsetruefalse12truefalsefalse00USD$falsetruefalse13truefalsefalse50000005000000USD$falsetruefalse14falsefalsefalse00falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22truefalsefalse20180000002018000000USD$falsetruefalse23truefalsefalse21590000002159000000USD$falsetruefalse24truefalsefalse20180000002018000000USD$falsetruefalse25truefalsefalse21590000002159000000USD$falsetruefalse26truefalsefalse00USD$falsetruefalse27truefalsefalse00USD$falsetruefalse28truefalsefalse00USD$falsetruefalse29truefalsefalse00USD$falsetruefalse30truefalsefalse00USD$falsetruefalse31truefalsefalse00USD$falsetruefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalse37falsefalsefalse00falsefalsefalse38falsefalsefalse00falsefalsefalse39falsefalsefalse00falsefalsefalse40truefalsefalse8600000086000000USD$falsetruefalse41truefalsefalse6100000061000000USD$falsetruefalse42truefalsefalse00USD$falsetruefalse43truefalsefalse00USD$falsetruefalse44truefalsefalse5400000054000000USD$falsetruefalse45truefalsefalse2900000029000000USD$falsetruefalse46truefalsefalse3200000032000000USD$falsetruefalse47truefalsefalse2700000027000000USD$falsetruefalse48truefalsefalse00USD$falsetruefalse49truefalsefalse50000005000000USD$falsetruefalse50falsefalsefalse00falsefalsefalse51falsefalsefalse00falsefalsefalse52falsefalsefalse00falsefalsefalse53falsefalsefalse00falsefalsefalse54falsefalsefalse00falsefalsefalse55falsefalsefalse00falsefalsefalse56falsefalsefalse00falsefalsefalse57falsefalsefalse00falsefalsefalse58truefalsefalse00USD$falsetruefalse59truefalsefalse00USD$falsetruefalse60truefalsefalse00USD$falsetruefalse61truefalsefalse00USD$falsetruefalse62truefalsefalse00USD$falsetruefalse63truefalsefalse00USD$falsetruefalse64truefalsefalse00USD$falsetruefalse65truefalsefalse00USD$falsetruefalse66truefalsefalse00USD$falsetruefalse67truefalsefalse00USD$falsetruefalse68falsefalsefalse00falsefalsefalse69falsefalsefalse00falsefalsefalse70falsefalsefalse00falsefalsefalse71falsefalsefalse00falsefalsefalse72falsefalsefalse00falsefalsefalse73falsefalsefalse00falsefalsefalse74falsefalsefalse00falsefalsefalse75falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Cash equivalents3false 4us-gaap_AvailableForSaleSecuritiesCurrentus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse112000000112000000falsefalsefalse2truefalsefalse100000000100000000falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse112000000112000000falsefalsefalse5truefalsefalse100000000100000000falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10truefalsefalse10000001000000falsefalsefalse11truefalsefalse40000004000000falsefalsefalse12truefalsefalse4100000041000000falsefalsefalse13truefalsefalse5100000051000000falsefalsefalse14truefalsefalse4500000045000000falsefalsefalse15truefalsefalse3100000031000000falsefalsefalse16truefalsefalse2500000025000000falsefalsefalse17truefalsefalse1000000010000000falsefalsefalse18truefalsefalse00falsefalsefalse19truefalsefalse40000004000000falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22truefalsefalse00falsefalsefalse23truefalsefalse00falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28truefalsefalse00falsefalsefalse29truefalsefalse00falsefalsefalse30truefalsefalse00falsefalsefalse31truefalsefalse00falsefalsefalse32truefalsefalse00falsefalsefalse33truefalsefalse00falsefalsefalse34truefalsefalse00falsefalsefalse35truefalsefalse00falsefalsefalse36truefalsefalse00falsefalsefalse37truefalsefalse00falsefalsefalse38falsefalsefalse00falsefalsefalse39falsefalsefalse00falsefalsefalse40truefalsefalse112000000112000000falsefalsefalse41truefalsefalse100000000100000000falsefalsefalse42falsefalsefalse00falsefalsefalse43falsefalsefalse00falsefalsefalse44falsefalsefalse00falsefalsefalse45falsefalsefalse00falsefalsefalse46truefalsefalse10000001000000falsefalsefalse47truefalsefalse40000004000000falsefalsefalse48truefalsefalse4100000041000000falsefalsefalse49truefalsefalse5100000051000000falsefalsefalse50truefalsefalse4500000045000000falsefalsefalse51truefalsefalse3100000031000000falsefalsefalse52truefalsefalse2500000025000000falsefalsefalse53truefalsefalse1000000010000000falsefalsefalse54truefalsefalse00falsefalsefalse55truefalsefalse40000004000000falsefalsefalse56falsefalsefalse00falsefalsefalse57falsefalsefalse00falsefalsefalse58truefalsefalse00falsefalsefalse59truefalsefalse00falsefalsefalse60falsefalsefalse00falsefalsefalse61falsefalsefalse00falsefalsefalse62falsefalsefalse00falsefalsefalse63falsefalsefalse00falsefalsefalse64truefalsefalse00falsefalsefalse65truefalsefalse00falsefalsefalse66truefalsefalse00falsefalsefalse67truefalsefalse00falsefalsefalse68truefalsefalse00falsefalsefalse69truefalsefalse00falsefalsefalse70truefalsefalse00falsefalsefalse71truefalsefalse00falsefalsefalse72truefalsefalse00falsefalsefalse73truefalsefalse00falsefalsefalse74falsefalsefalse00falsefalsefalse75falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 4, 5 -Chapter 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Short-term investments4false 4us-gaap_AvailableForSaleSecuritiesNoncurrentus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse347000000347000000falsefalsefalse2truefalsefalse374000000374000000falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse347000000347000000falsefalsefalse5truefalsefalse374000000374000000falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12truefalsefalse5500000055000000falsefalsefalse13truefalsefalse8800000088000000falsefalsefalse14truefalsefalse211000000211000000falsefalsefalse15truefalsefalse203000000203000000falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18truefalsefalse7200000072000000falsefalsefalse19truefalsefalse7300000073000000falsefalsefalse20truefalsefalse90000009000000falsefalsefalse21truefalsefalse1000000010000000falsefalsefalse22truefalsefalse70000007000000falsefalsefalse23truefalsefalse50000005000000falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30truefalsefalse00falsefalsefalse31truefalsefalse00falsefalsefalse32truefalsefalse00falsefalsefalse33truefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36truefalsefalse00falsefalsefalse37truefalsefalse00falsefalsefalse38truefalsefalse70000007000000falsefalsefalse39truefalsefalse50000005000000falsefalsefalse40truefalsefalse340000000340000000falsefalsefalse41truefalsefalse369000000369000000falsefalsefalse42falsefalsefalse00falsefalsefalse43falsefalsefalse00falsefalsefalse44falsefalsefalse00falsefalsefalse45falsefalsefalse00falsefalsefalse46falsefalsefalse00falsefalsefalse47falsefalsefalse00falsefalsefalse48truefalsefalse5500000055000000falsefalsefalse49truefalsefalse8800000088000000falsefalsefalse50truefalsefalse211000000211000000falsefalsefalse51truefalsefalse203000000203000000falsefalsefalse52falsefalsefalse00falsefalsefalse53falsefalsefalse00falsefalsefalse54truefalsefalse7200000072000000falsefalsefalse55truefalsefalse7300000073000000falsefalsefalse56truefalsefalse20000002000000falsefalsefalse57truefalsefalse50000005000000falsefalsefalse58truefalsefalse00falsefalsefalse59truefalsefalse00falsefalsefalse60falsefalsefalse00falsefalsefalse61falsefalsefalse00falsefalsefalse62falsefalsefalse00falsefalsefalse63falsefalsefalse00falsefalsefalse64falsefalsefalse00falsefalsefalse65falsefalsefalse00falsefalsefalse66truefalsefalse00falsefalsefalse67truefalsefalse00falsefalsefalse68truefalsefalse00falsefalsefalse69truefalsefalse00falsefalsefalse70falsefalsefalse00falsefalsefalse71falsefalsefalse00falsefalsefalse72truefalsefalse00falsefalsefalse73truefalsefalse00falsefalsefalse74truefalsefalse00falsefalsefalse75truefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryInvestments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Long-term marketable investments5false 4us-gaap_AssetsFairValueDisclosureus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse25630000002563000000falsefalsefalse5truefalsefalse26940000002694000000falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22truefalsefalse20250000002025000000falsefalsefalse23truefalsefalse21640000002164000000falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30falsefalsefalse00falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalse37falsefalsefalse00falsefalsefalse38falsefalsefalse00falsefalsefalse39falsefalsefalse00falsefalsefalse40truefalsefalse538000000538000000falsefalsefalse41truefalsefalse530000000530000000falsefalsefalse42falsefalsefalse00falsefalsefalse43falsefalsefalse00falsefalsefalse44falsefalsefalse00falsefalsefalse45falsefalsefalse00falsefalsefalse46falsefalsefalse00falsefalsefalse47falsefalsefalse00falsefalsefalse48falsefalsefalse00falsefalsefalse49falsefalsefalse00falsefalsefalse50falsefalsefalse00falsefalsefalse51falsefalsefalse00falsefalsefalse52falsefalsefalse00falsefalsefalse53falsefalsefalse00falsefalsefalse54falsefalsefalse00falsefalsefalse55falsefalsefalse00falsefalsefalse56falsefalsefalse00falsefalsefalse57falsefalsefalse00falsefalsefalse58truefalsefalse00falsefalsefalse59truefalsefalse00falsefalsefalse60falsefalsefalse00falsefalsefalse61falsefalsefalse00falsefalsefalse62falsefalsefalse00falsefalsefalse63falsefalsefalse00falsefalsefalse64falsefalsefalse00falsefalsefalse65falsefalsefalse00falsefalsefalse66falsefalsefalse00falsefalsefalse67falsefalsefalse00falsefalsefalse68falsefalsefalse00falsefalsefalse69falsefalsefalse00falsefalsefalse70falsefalsefalse00falsefalsefalse71falsefalsefalse00falsefalsefalse72falsefalsefalse00falsefalsefalse73falsefalsefalse00falsefalsefalse74falsefalsefalse00falsefalsefalse75falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 true2Total assets measured at fair value on a recurring basis6false 4us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairmentus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse6900000069000000falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22falsefalsefalse00falsefalsefalse23falsefalsefalse00falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30falsefalsefalse00falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalse37falsefalsefalse00falsefalsefalse38falsefalsefalse00falsefalsefalse39falsefalsefalse00falsefalsefalse40falsefalsefalse00falsefalsefalse41falsefalsefalse00falsefalsefalse42falsefalsefalse00falsefalsefalse43falsefalsefalse00falsefalsefalse44falsefalsefalse00falsefalsefalse45falsefalsefalse00falsefalsefalse46falsefalsefalse00falsefalsefalse47falsefalsefalse00falsefalsefalse48falsefalsefalse00falsefalsefalse49falsefalsefalse00falsefalsefalse50falsefalsefalse00falsefalsefalse51falsefalsefalse00falsefalsefalse52falsefalsefalse00falsefalsefalse53falsefalsefalse00falsefalsefalse54falsefalsefalse00falsefalsefalse55falsefalsefalse00falsefalsefalse56falsefalsefalse00falsefalsefalse57falsefalsefalse00falsefalsefalse58falsefalsefalse00falsefalsefalse59falsefalsefalse00falsefalsefalse60falsefalsefalse00falsefalsefalse61falsefalsefalse00falsefalsefalse62falsefalsefalse00falsefalsefalse63falsefalsefalse00falsefalsefalse64falsefalsefalse00falsefalsefalse65falsefalsefalse00falsefalsefalse66falsefalsefalse00falsefalsefalse67falsefalsefalse00falsefalsefalse68falsefalsefalse00falsefalsefalse69falsefalsefalse00falsefalsefalse70falsefalsefalse00falsefalsefalse71falsefalsefalse00falsefalsefalse72falsefalsefalse00falsefalsefalse73falsefalsefalse00falsefalsefalse74falsefalsefalse00falsefalsefalse75falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=7658923&loc=d3e32787-111569 false2Other than temporary impairment in Transform7false 4us-gaap_EquityMethodInvestmentsus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse272000000272000000USD$falsetruefalse2truefalsefalse389000000389000000USD$falsetruefalse3truefalsefalse00USD$falsetruefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalse15falsefalsefalse00falsefalsefalse16falsefalsefalse00falsefalsefalse17falsefalsefalse00falsefalsefalse18falsefalsefalse00falsefalsefalse19falsefalsefalse00falsefalsefalse20falsefalsefalse00falsefalsefalse21falsefalsefalse00falsefalsefalse22falsefalsefalse00falsefalsefalse23falsefalsefalse00falsefalsefalse24falsefalsefalse00falsefalsefalse25falsefalsefalse00falsefalsefalse26falsefalsefalse00falsefalsefalse27falsefalsefalse00falsefalsefalse28falsefalsefalse00falsefalsefalse29falsefalsefalse00falsefalsefalse30falsefalsefalse00falsefalsefalse31falsefalsefalse00falsefalsefalse32falsefalsefalse00falsefalsefalse33falsefalsefalse00falsefalsefalse34falsefalsefalse00falsefalsefalse35falsefalsefalse00falsefalsefalse36falsefalsefalse00falsefalsefalse37falsefalsefalse00falsefalsefalse38falsefalsefalse00falsefalsefalse39falsefalsefalse00falsefalsefalse40falsefalsefalse00falsefalsefalse41falsefalsefalse00falsefalsefalse42falsefalsefalse00falsefalsefalse43falsefalsefalse00falsefalsefalse44falsefalsefalse00falsefalsefalse45falsefalsefalse00falsefalsefalse46falsefalsefalse00falsefalsefalse47falsefalsefalse00falsefalsefalse48falsefalsefalse00falsefalsefalse49falsefalsefalse00falsefalsefalse50falsefalsefalse00falsefalsefalse51falsefalsefalse00falsefalsefalse52falsefalsefalse00falsefalsefalse53falsefalsefalse00falsefalsefalse54falsefalsefalse00falsefalsefalse55falsefalsefalse00falsefalsefalse56falsefalsefalse00falsefalsefalse57falsefalsefalse00falsefalsefalse58falsefalsefalse00falsefalsefalse59falsefalsefalse00falsefalsefalse60falsefalsefalse00falsefalsefalse61falsefalsefalse00falsefalsefalse62falsefalsefalse00falsefalsefalse63falsefalsefalse00falsefalsefalse64falsefalsefalse00falsefalsefalse65falsefalsefalse00falsefalsefalse66falsefalsefalse00falsefalsefalse67falsefalsefalse00falsefalsefalse68falsefalsefalse00falsefalsefalse69falsefalsefalse00falsefalsefalse70falsefalsefalse00falsefalsefalse71falsefalsefalse00falsefalsefalse72falsefalsefalse00falsefalsefalse73falsefalsefalse00falsefalsefalse74falsefalsefalse00falsefalsefalse75falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 false2Equity method investmentsfalseFair Value Measurements - Assets measured (Details) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.micron.com/role/FairValueMeasurementsAssetsMeasuredDetails757