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Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
May. 31, 2015
May. 31, 2014
Feb. 28, 2015
Components of accumulated other comprehensive loss      
Balance $ 904,565    
Tax effects (55) $ (369)  
Other comprehensive income 93 $ 801  
Balance 932,137    
Unrealized Holding Gains (Losses) On Cash Flow Hedges | Foreign currency contracts      
Components of accumulated other comprehensive loss      
Balance (76)    
Other comprehensive income before reclassification 267    
Amounts reclassified out of accumulated other comprehensive income (loss) (119)    
Tax effects (55)    
Other comprehensive income 93    
Balance 17    
Net deferred tax benefits     $ 30
Net deferred tax expense $ (20)