Credit Facility (Details) (USD $)	0 Months Ended	12 Months Ended
	Aug. 13, 2012	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Line of Credit Facility [Line Items]
Fixed-charge coverage ratio required per credit agreement	1
Credit facility, covenant term, length of duration to stay, satisfy, bond or discharge material judgement	30 days
Payments of debt issuance costs		$ 2,332,000	$ 0	$ 20,301,000
Letter of Credit [Member] | Deutsche Bank AG New York Branch, Bank of America, N.A., and Morgan Stanley Senior Funding, Inc. and Wells Fargo Bank [Member]
Line of Credit Facility [Line Items]
Credit facility, current borrowing capacity	150,000,000
Credit facility, maximum borrowing capacity	200,000,000
Letters of credit collateralized by the credit facility		50,800,000
Canadian Borrower [Member] | Letter of Credit [Member] | Deutsche Bank AG New York Branch, Bank of America, N.A., and Morgan Stanley Senior Funding, Inc. and Wells Fargo Bank [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity for Canadian dollar denominated loans to Canadian subsidiary	20,000,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt issuance costs	2,700,000
Payments of debt issuance costs		2,300,000
Point Two Five Percent Convertible Senior Notes Due 2013 [Member]
Line of Credit Facility [Line Items]
Interest rate on convertible notes	0.25%	0.25%	0.25%	0.25%
4.0% Convertible Senior Notes due March 15, 2015 [Member]
Line of Credit Facility [Line Items]
Interest rate on convertible notes	4.00%	4.00%	4.00%	4.00%
Minimum [Member]
Line of Credit Facility [Line Items]
Credit facility, unused capacity, commitment fee percentage	0.50%
Credit facility, minimum required unrestricted cash and cash equivalents	200,000,000
Minimum [Member] | Line of Credit [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Credit facility margin on variable interest rate	2.00%
Minimum [Member] | Line of Credit [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Credit facility margin on variable interest rate	1.00%
Maximum [Member]
Line of Credit Facility [Line Items]
Credit facility, unused capacity, commitment fee percentage	0.375%
Credit facility, percent of excess availability for coverage ratio to apply	12.50%
Credit facility, amount of excess availability for coverage ratio to apply	15,000,000
Maximum [Member] | Line of Credit [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Credit facility margin on variable interest rate	2.50%
Maximum [Member] | Line of Credit [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Credit facility margin on variable interest rate	1.50%