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Convertible Notes Payable (Details) (USD $)
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12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | |||||||||||||||||||
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Oct. 31, 2012
D
debtinstrument
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Oct. 31, 2011
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Oct. 31, 2010
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Oct. 31, 2012
Embedded redemption feature [Member]
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Oct. 31, 2010
0.25% Convertible Senior Notes due May 1, 2013 [Member]
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Apr. 30, 2006
0.25% Convertible Senior Notes due May 1, 2013 [Member]
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Oct. 31, 2012
0.25% Convertible Senior Notes due May 1, 2013 [Member]
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Aug. 13, 2012
0.25% Convertible Senior Notes due May 1, 2013 [Member]
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Oct. 31, 2011
0.25% Convertible Senior Notes due May 1, 2013 [Member]
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Apr. 10, 2006
0.25% Convertible Senior Notes due May 1, 2013 [Member]
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Apr. 30, 2010
4.0% Convertible Senior Notes due March 15, 2015 [Member]
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Oct. 31, 2012
4.0% Convertible Senior Notes due March 15, 2015 [Member]
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Aug. 13, 2012
4.0% Convertible Senior Notes due March 15, 2015 [Member]
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Oct. 31, 2011
4.0% Convertible Senior Notes due March 15, 2015 [Member]
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Oct. 31, 2010
4.0% Convertible Senior Notes due March 15, 2015 [Member]
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Mar. 15, 2010
4.0% Convertible Senior Notes due March 15, 2015 [Member]
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Jul. 31, 2007
0.875% Convertible Senior Notes due June 15, 2017 [Member]
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Oct. 31, 2012
0.875% Convertible Senior Notes due June 15, 2017 [Member]
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Oct. 31, 2011
0.875% Convertible Senior Notes due June 15, 2017 [Member]
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Oct. 31, 2010
0.875% Convertible Senior Notes due June 15, 2017 [Member]
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Jun. 11, 2007
0.875% Convertible Senior Notes due June 15, 2017 [Member]
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Oct. 31, 2010
3.75% Convertible Senior Notes due October 15, 2018 [Member]
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Oct. 31, 2012
3.75% Convertible Senior Notes due October 15, 2018 [Member]
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Oct. 31, 2011
3.75% Convertible Senior Notes due October 15, 2018 [Member]
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Oct. 18, 2010
3.75% Convertible Senior Notes due October 15, 2018 [Member]
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| Convertible Notes Payable (Textuals) [Abstract] | ||||||||||||||||||||||||||||
| Number of issuances of convertible notes payable outstanding | 4 | |||||||||||||||||||||||||||
| Minimum percentage of aggregate principal amount required to be held by trustee or holders to declare notes immediately payable | 25.00% | |||||||||||||||||||||||||||
| Interest rate on convertible notes | 0.25% | 0.25% | 0.25% | 0.25% | 4.00% | 4.00% | 4.00% | 4.00% | 0.875% | 0.875% | 0.875% | 3.75% | 3.75% | 3.75% | ||||||||||||||
| Aggregate principal amount | $ 300,000,000 | $ 375,000,000 | $ 500,000,000 | $ 350,000,000 | ||||||||||||||||||||||||
| Amount repurchased | 81,800,000 | |||||||||||||||||||||||||||
| Gain on extinguishment of debt | 0 | 0 | 4,948,000 | 4,900,000 | ||||||||||||||||||||||||
| Convertible notes payable | 216,210,000 | 0 | 216,210,000 | |||||||||||||||||||||||||
| Number of shares converted for each $1000 principal amount (in shares) | 25.3001 | 49.0557 | 26.2154 | 49.5872 | ||||||||||||||||||||||||
| Principal amount used for conversion of notes | 1,000 | |||||||||||||||||||||||||||
| Initial conversion price per share equivalent (per share) | $ 39.5255 | $ 20.38 | $ 38.15 | $ 20.17 | ||||||||||||||||||||||||
| Minimum number of trading days in 30 consecutive trading day period prior to redemption notice date where closing price exceeds conversion price by a minimum percentage | 20 | |||||||||||||||||||||||||||
| Number of consecutive trading day period prior to redemption notice date where closing price exceeds conversion price by a minimum percentage | 30 | |||||||||||||||||||||||||||
| Redemption option, closing price to conversion price, minimum percentage | 130.00% | 150.00% | ||||||||||||||||||||||||||
| Net proceeds from convertible senior notes offering used to purchase call spread option on its common stock | 28,500,000 | 42,500,000 | ||||||||||||||||||||||||||
| Discount rate used for make whole premium payment calculation | 2.75% | |||||||||||||||||||||||||||
| Fair value of embedded redemption feature included in long-term assets | 420,000 | 7,020,000 | 400,000 | |||||||||||||||||||||||||
| Change in fair value of embedded redemption feature included in interest and other income (loss) | (6,600,000) | 2,800,000 | 2,510,000 | |||||||||||||||||||||||||
| Net proceeds from issuance of senior convertible notes | 0 | 0 | 725,000,000 | 364,300,000 | 340,400,000 | |||||||||||||||||||||||
| Net proceeds from convertible senior notes offering used to replace contractual obligation to issue convertible notes as part of acqusition | 243,800,000 | |||||||||||||||||||||||||||
| Net proceeds from convertible senior notes offering used to repurchase 0.25% convertible senior notes due 2013 | 76,100,000 | |||||||||||||||||||||||||||
| Carrying value and estimated current fair value of outstanding convertible notes | ||||||||||||||||||||||||||||
| Long term convertible notes payable | 1,225,806,000 | 1,442,364,000 | 375,806,000 | [1] | 500,000,000 | 350,000,000 | ||||||||||||||||||||||
| Carrying Value | 1,442,016,000 | |||||||||||||||||||||||||||
| Fair Value | $ 1,396,810,000 | $ 213,237,000 | $ 397,885,000 | [1] | $ 425,625,000 | $ 360,063,000 | ||||||||||||||||||||||
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