Subsequent Events (Details) (USD $)		12 Months Ended				0 Months Ended
	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]	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]	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