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Commitments and Contingencies Commitments and Contingencies (Schedule of Future Minimum Rental Payments for Operating Leases) (Details) (USD $)
12 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2012
Operating Leased Assets [Line Items]      
2015 $ 8,140,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 6,630,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 4,813,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 4,044,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 3,576,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 12,320,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total Minimum Lease Payments 39,523,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Rental expense on operating leases $ 7,700,000us-gaap_OperatingLeasesRentExpenseNet $ 6,500,000us-gaap_OperatingLeasesRentExpenseNet $ 5,500,000us-gaap_OperatingLeasesRentExpenseNet
Minimum      
Operating Leased Assets [Line Items]      
Noncancelable operating leases, term 3 years    
Maximum      
Operating Leased Assets [Line Items]      
Noncancelable operating leases, term 5 years    
Noncancelable operating leases, renewal term 5 years