Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Nov. 30, 2014
Other Assets [Abstract]
Cash surrender value of insurance contracts	$ 70,795	$ 70,571
Debt issuance costs	28,929us-gaap_DeferredFinanceCostsNet	27,082us-gaap_DeferredFinanceCostsNet
Property and equipment, net	11,610us-gaap_PropertyPlantAndEquipmentNet	11,831us-gaap_PropertyPlantAndEquipmentNet
Prepaid expenses	8,539	5,431
Total	$ 119,873us-gaap_OtherAssets	$ 114,915us-gaap_OtherAssets
Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.375%
Senior Notes [Member] \| Senior Notes Due Two Thousand Nineteen at Four Point Seven Five Percent [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%	4.75%

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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Contractual interest rate for funds borrowed, under the debt agreement.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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