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Financial Instruments and Risk Management (Details) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2018
May 31, 2017
Foreign Currency Risk and Currency Exchange Uncertainties    
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps, in income tax expense $ 300 $ 100
Currency Exchange Uncertainties    
Sales revenue, net 354,679 325,491
Operating income (loss) 43,327 30,583
SG&A    
Foreign Currency Risk and Currency Exchange Uncertainties    
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps $ (1,600) $ 600
Net sales revenue | Geographic concentration | International operations - transactions denominated in foreign currencies    
Foreign Currency Risk and Currency Exchange Uncertainties    
Concentration risk percentage 14.00% 13.00%