Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013		Nov. 30, 2012		Jan. 29, 2013 Convertible senior notes due February 1, 2019 at 1.375%
Other Assets [Line Items]
Cash surrender value of insurance contracts	$ 68,534		$ 64,757
Property and equipment, net	8,460		7,920
Debt issuance costs	27,366	[1]	14,563	[1]
Prepaid expenses	2,716		7,810
Total	$ 107,076		$ 95,050
Senior notes, rate					1.375%

[1] The increase in debt issuance costs as of November 30, 2013 compared to November 30, 2012 primarily reflected the costs associated with our underwritten public issuances of the 1.375% Convertible Senior Notes due 2019 and the 7.00% Senior Notes due 2021, and our entry into the Credit Facility during 2013.