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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, 2013
Nov. 30, 2012
Nov. 30, 2011
Operating Leased Assets [Line Items]      
2013 $ 7,158,000    
2014 5,276,000    
2015 3,224,000    
2016 1,649,000    
2017 1,098,000    
Thereafter 387,000    
Total Minimum Lease Payments 18,792,000    
Rental expense on operating leases $ 6,500,000 $ 5,500,000 $ 6,700,000
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