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Subsequent Events (Details) (USD $)
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12 Months Ended | 0 Months Ended | |||||
|---|---|---|---|---|---|---|---|
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Oct. 31, 2012
|
Oct. 31, 2012
4.0% Convertible Senior Notes due March 15, 2015 [Member]
|
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]
|
Oct. 31, 2010
4.0% Convertible Senior Notes due March 15, 2015 [Member]
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Dec. 27, 2012
Forecast [Member]
4.0% Convertible Senior Notes due March 15, 2015 [Member]
Refinancing of Debt [Member]
|
Dec. 27, 2012
Forecast [Member]
4.0% Convertible Senior Notes Due 2020 [Member]
Refinancing of Debt [Member]
|
|
| Subsequent Event [Line Items] | |||||||
| Retired principal amount | $ 187,500,000 | ||||||
| Interest rate on convertible notes | 4.00% | 4.00% | 4.00% | 4.00% | 4.00% | 4.00% | |
| Principal amount of new series of convertible notes | 187,500,000 | ||||||
| Aggregate principal amount | 187,500,000 | 187,500,000 | |||||
| Principal amount denomination for semi-annual interest payments | 1,000 | ||||||
| Accretion rate of principal amount | 1.85% | ||||||
| Number of shares converted for each $1000 principal amount (in shares) | 49.0557 | 49.0557 | |||||
| Principal amount used for conversion of notes | $ 1,000 | $ 1,000 | |||||
| Initial conversion price per share equivalent (per share) | $ 20.38 | $ 20.385 | |||||
| Shares of common stock reserved for future issuance | 9,197,944 | ||||||