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Financial Instruments and Risk Management (Details) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2017
May 31, 2016
Currency Exchange Uncertainties    
Sales revenue, net $ 359,605 $ 347,938
Operating income (3,234) 22,898
SG&A    
Foreign Currency Risk and Currency Exchange Uncertainties    
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps 600 $ 200
Current income tax expense    
Foreign Currency Risk and Currency Exchange Uncertainties    
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps $ (100)  
Net sales revenue | Geographic concentration | International operations - transactions denominated in foreign currencies    
Foreign Currency Risk and Currency Exchange Uncertainties    
Concentration risk percentage 12.00% 14.00%