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Financial Instruments and Risk Management (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2017
Aug. 31, 2016
Currency Exchange Uncertainties        
Sales revenue, net $ 378,462 $ 368,170 $ 738,067 $ 716,108
Operating income (loss) 20,108 37,487 16,874 60,385
SG&A        
Foreign Currency Risk and Currency Exchange Uncertainties        
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps 100 (700) 700 (500)
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, in income tax expense $ (500) $ 100 $ (600) $ 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% 11.00% 13.00% 12.00%