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New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2016
Feb. 29, 2016
May 31, 2016
May 31, 2015
ASU 2015-17 | Current deferred tax assets, net        
New Accounting Pronouncements        
Impact of recent accounting changes $ (18,921) $ (17,636)    
ASU 2015-17 | Long-term deferred tax assets, net        
New Accounting Pronouncements        
Impact of recent accounting changes 1,127 879    
ASU 2015-17 | Long-term deferred tax liabilities, net        
New Accounting Pronouncements        
Impact of recent accounting changes (17,795) (16,757)    
ASU 2015-03 | Other assets – debt issuance costs        
New Accounting Pronouncements        
Impact of recent accounting changes (12,630) (12,618)    
ASU 2015-03 | Other assets – accumulated amortization        
New Accounting Pronouncements        
Impact of recent accounting changes (8,914) (8,625)    
ASU 2015-03 | Long-term debt, current maturities        
New Accounting Pronouncements        
Impact of recent accounting changes (1,160) (1,156)    
ASU 2015-03 | Long-term debt, excluding current maturities        
New Accounting Pronouncements        
Impact of recent accounting changes (2,556) $ (2,837)    
ASU 2016-09 | Accrued income taxes        
New Accounting Pronouncements        
Impact of recent accounting changes     $ 1,110 $ 319
ASU 2016-09 | Share-based compensation tax benefit        
New Accounting Pronouncements        
Impact of recent accounting changes     (1,110) $ (319)
ASU 2016-09 | Share-based compensation expense        
New Accounting Pronouncements        
Impact of recent accounting changes     229  
ASU 2016-09 | Income tax expense        
New Accounting Pronouncements        
Impact of recent accounting changes     $ (1,110)  
ASU 2016-09 | Long-term deferred tax assets, net        
New Accounting Pronouncements        
Impact of recent accounting changes (232)      
ASU 2016-09 | Additional paid-in capital        
New Accounting Pronouncements        
Impact of recent accounting changes 588      
ASU 2016-09 | Retained earnings        
New Accounting Pronouncements        
Impact of recent accounting changes $ (820)