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Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2015
Aug. 31, 2014
Feb. 28, 2015
Components of accumulated other comprehensive loss          
Balance     $ 904,565    
Tax effects $ (120) $ (141) (175) $ (510)  
Other comprehensive income 304 $ 346 397 $ 1,147  
Balance 911,266   911,266    
Unrealized Holding Gains (Losses) On Cash Flow Hedges | Foreign currency contracts          
Components of accumulated other comprehensive loss          
Balance     (76)    
Other comprehensive income before reclassification     812    
Amounts reclassified out of accumulated other comprehensive income (loss)     (240)    
Tax effects     (175)    
Other comprehensive income     397    
Balance 321   321    
Net deferred tax benefits         $ 30
Net deferred tax expense $ (140)   $ (140)