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