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Other Assets (Details) (USD $) | Aug. 31, 2013 | Mar. 12, 2013 | Nov. 30, 2012 | Jan. 29, 2013 Convertible senior notes due February 1, 2019 at 1.375%
--- | --- | --- | --- | ---
Other Assets [Abstract] |  |  |  |  |  |
Cash surrender value of insurance contracts | $ 65,973,000 |  |  | $ 64,757,000 |  |
Debt issuance costs | 21,885,000 | [1] |  | 14,563,000 | [1] |
Property and equipment, net | 7,880,000 |  |  | 7,920,000 |  |
Prepaid expenses | 5,509,000 |  |  | 7,810,000 |  |
Total | 101,247,000 |  |  | 95,050,000 |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | 230,000,000
Unsecured revolving credit facility, current borrowing capacity |  |  | $ 200,000,000.0 |  |  |
[1] | The increase in debt issuance costs as of August 31, 2013 compared to November 30, 2012 primarily reflected the costs associated with our underwritten public issuance of the $230 Million Convertible Senior Notes during the first quarter of 2013 and our entry into a $200.0 million unsecured revolving credit facility (the “Credit Facility”) during the second quarter of 2013.

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