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New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
ASU 2015-17 | Current deferred tax assets, net    
New Accounting Pronouncements    
Impact of recent accounting changes $ (23,131) $ (17,636)
ASU 2015-17 | Long-term deferred tax assets, net    
New Accounting Pronouncements    
Impact of recent accounting changes 1,038 879
ASU 2015-17 | Current deferred tax liabilities, net    
New Accounting Pronouncements    
Impact of recent accounting changes 168  
ASU 2015-17 | Long-term deferred tax liabilities, net    
New Accounting Pronouncements    
Impact of recent accounting changes (21,925) (16,757)
ASU 2015-03 | Other assets – debt issuance costs    
New Accounting Pronouncements    
Impact of recent accounting changes (14,917) (12,618)
ASU 2015-03 | Other assets – accumulated amortization    
New Accounting Pronouncements    
Impact of recent accounting changes (9,824) (8,625)
ASU 2015-03 | Long-term debt, current maturities    
New Accounting Pronouncements    
Impact of recent accounting changes (1,296) (1,156)
ASU 2015-03 | Long-term debt, excluding current maturities    
New Accounting Pronouncements    
Impact of recent accounting changes (3,796) (2,837)
ASU 2016-09 | Accrued income taxes    
New Accounting Pronouncements    
Impact of recent accounting changes 1,844 989
ASU 2016-09 | Share-based compensation tax benefit    
New Accounting Pronouncements    
Impact of recent accounting changes (1,844) $ (989)
ASU 2016-09 | Share-based compensation expense    
New Accounting Pronouncements    
Impact of recent accounting changes 1,754  
ASU 2016-09 | Current income tax expense    
New Accounting Pronouncements    
Impact of recent accounting changes (1,844)  
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 $ (856)