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Other Assets (Details) (USD $) | Aug. 31, 2014 | Nov. 30, 2013 | Jan. 29, 2013 Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] [Member] | Aug. 31, 2014 Senior Notes [Member] Senior Notes Due Two Thousand Nineteen at Four Point Seven Five Percent [Member] | Mar. 25, 2014 Senior Notes [Member] Senior Notes Due Two Thousand Nineteen at Four Point Seven Five Percent [Member]
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Other Assets [Abstract] |  |  |  |  |
Cash surrender value of insurance contracts | $ 70,763,000 | $ 68,534,000 |  |  |
Debt issuance costs | 28,601,000 | 27,366,000 |  |  |
Property and equipment, net | 10,936,000 | 8,460,000 |  |  |
Prepaid expenses | 7,862,000 | 2,716,000 |  |  |
Total | 118,162,000 | 107,076,000 |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.375% | 4.75% |
Debt Instrument, Face Amount |  |  |  |  | $ 400,000,000.0

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