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Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 31, 2017
May 31, 2016
Feb. 28, 2017
Components of accumulated other comprehensive loss      
Balance $ 1,173    
Tax effects 370 $ 177  
Other comprehensive income (loss) (2,177) (684)  
Balance (1,004)   $ 1,173
Net deferred tax benefits (expense) 12,174 $ 3,402  
Accumulated other comprehensive income (loss)      
Components of accumulated other comprehensive loss      
Balance 1,173    
Balance (1,004)   1,173
Unrealized Holding Gains (Losses) On Cash Flow Hedges      
Components of accumulated other comprehensive loss      
Other comprehensive income before reclassification (2,245)    
Amounts reclassified out of accumulated other comprehensive income (302)    
Tax effects 370    
Other comprehensive income (loss) (2,177)    
Unrealized Holding Gains (Losses) On Cash Flow Hedges | Foreign currency contracts      
Components of accumulated other comprehensive loss      
Net deferred tax benefits (expense) $ (100)   $ 200