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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.