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Fair Value - Summary of Assets and Liabilities Measured at Estimated Fair Value on Recurring basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
May 31, 2017
Nov. 30, 2016
Assets    
Derivative financial instruments $ 1,530 $ 897
Total assets 1,530 897
Level 2    
Assets    
Derivative financial instruments 1,530 897
Total assets $ 1,530 $ 897