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Financial Instruments and Risk Management (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Nov. 30, 2017
Nov. 30, 2016
Currency Exchange Uncertainties        
Sales revenue, net $ 453,045 $ 444,414 $ 1,191,112 $ 1,160,522
Operating income (loss) (15,630) 63,319 1,244 123,704
SG&A        
Foreign Currency Risk and Currency Exchange Uncertainties        
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps (2,200) (100) (1,500) (600)
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) $ (200) $ (700) $ (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% 12.00% 12.00% 12.00%