2.2.0.25falsefalse41405 - Disclosure - Stock-Based Compensation (Stock Option Valuation) (Details)truefalsefalse1falsefalseUSDfalsefalse1/31/2010 - 1/29/2011 USD ($) USD ($) / shares $Duration_1_31_2010_To_1_29_2011http://www.sec.gov/CIK0001166126duration2010-01-31T00:00:002011-01-29T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse2/1/2009 - 1/30/2010 USD ($) USD ($) / shares $Duration_2_1_2009_To_1_30_2010http://www.sec.gov/CIK0001166126duration2009-02-01T00:00:002010-01-30T00:00:00Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3falsefalseUSDfalsefalse2/3/2008 - 1/31/2009 USD ($) USD ($) / shares $Duration_2_3_2008_To_1_31_2009http://www.sec.gov/CIK0001166126duration2008-02-03T00:00:002009-01-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$5false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse4.54.5falsefalsefalsefalsefalse2truefalsefalse4.54.5falsefalsefalsefalsefalse3truefalsefalse4.64.6falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalThe period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(a) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 falsefalseWeighted-average expected option term6false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.380.38falsefalsefalsefalsefalse2truetruefalse0.570.57falsefalsefalsefalsefalse3truetruefalse0.4470.447falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe estimated measure of the percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(b) falsefalseWeighted-average expected volatility7false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0220.022falsefalsefalsefalsefalse2truetruefalse0.0180.018falsefalsefalsefalsefalse3truetruefalse0.0270.027falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe risk-free interest rate assumption that is used in valuing an option on its own shares.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) falsefalseWeighted-average risk free interest rate8false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0220.022falsefalsefalsefalsefalse2truetruefalse0.0330.033falsefalsefalsefalsefalse3truetruefalse0.020.02falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) falsefalseWeighted-average expected dividend yield9false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRangeOfDividendsUsedus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse001.8% – 2.9%1.8% – 2.9%falsefalsefalsefalsefalse2falsefalsefalse001.8% – 5.0%1.8% – 5.0%falsefalsefalsefalsefalse3falsefalsefalse001.2% – 5.6%1.2% – 5.6%falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf different dividend rates are used during the contractual term, then disclose the range of expected dividends used.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) falsefalseExpected dividend yield range35Stock-Based Compensation (Stock Option Valuation) (Details)UnKnownUnKnownUnKnownUnKnowntruetrue