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Derivative Instruments (Outstanding Foreign Currency Forward Contracts) (Details) - USD ($)
$ in Thousands
Nov. 30, 2018
Nov. 30, 2017
Derivative [Line Items]    
Derivative contracts, notional value $ 106,070 $ 119,654
Derivative contracts, fair value (170) (27)
Forward contracts to sell U.S. dollars    
Derivative [Line Items]    
Derivative contracts, notional value 105,830 119,192
Derivative contracts, fair value (170) (27)
Forward contracts to purchase U.S. dollars    
Derivative [Line Items]    
Derivative contracts, notional value 240 462
Derivative contracts, fair value $ 0 $ 0