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Other Assets (Details) (USD $)
Aug. 31, 2012
Nov. 30, 2011
Debt Instrument [Line Items]    
Cash surrender value of insurance contracts $ 63,747,000 $ 59,718,000
Debt issuance costs 15,291,000 [1] 4,219,000 [1]
Property and equipment, net 7,709,000 7,801,000
Prepaid expenses 4,402,000 2,214,000
Net deferred tax assets 0 1,152,000
Total 91,149,000 75,104,000
Senior Notes due 2020 at 8.00%
   
Other Assets, Debt Issuance Costs    
Senior notes 350,000,000  
Senior notes, rate 8.00% 8.00%
Senior Notes due 2022 at 7.50%
   
Other Assets, Debt Issuance Costs    
Senior notes $ 350,000,000  
Senior notes, rate 7.50% 7.50%
[1] The increase in debt issuance costs as of August 31, 2012 compared to November 30, 2011 primarily reflected the costs associated with the Company's issuance of $350.0 million in aggregate principal amount of 8.00% senior notes due 2020 (the “$350 Million 8.00% Senior Notes”) and $350.0 million in aggregate principal amount of 7.50% senior notes due 2022 (the “$350 Million 7.50% Senior Notes”) during the nine months ended August 31, 2012.