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Derivative Instruments (Schedule of Derivatives) (Details) - USD ($)
Aug. 31, 2019
Nov. 30, 2018
Derivative [Line Items]    
Notional Value $ 76,255,000 $ 106,070,000
Fair Value (2,910,000) (170,000)
Interest rate swap contracts designated as cash flow hedges    
Derivative [Line Items]    
Notional Value 149,063,000 0
Fair Value (3,348,000) 0
Forward contracts to sell U.S. dollars    
Derivative [Line Items]    
Notional Value 75,096,000 105,830,000
Fair Value (2,915,000) (170,000)
Forward contracts to purchase U.S. dollars    
Derivative [Line Items]    
Notional Value 1,159,000 240,000
Fair Value $ 5,000 $ 0