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Derivative Instruments (Outstanding Foreign Currency Forward Contracts) (Details) - USD ($)
$ in Thousands
Feb. 28, 2017
Nov. 30, 2016
Derivative [Line Items]    
Derivative contracts, notional value $ 104,709 $ 76,363
Derivative contracts, fair value (6,728) (6,616)
Forward contracts to sell U.S. dollars [Member]    
Derivative [Line Items]    
Derivative contracts, notional value 104,709 74,690
Derivative contracts, fair value (6,728) (6,597)
Forward contracts to purchase U.S. dollars [Member]    
Derivative [Line Items]    
Derivative contracts, notional value 0 1,673
Derivative contracts, fair value $ 0 $ (19)