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Stock-based Compensation (Details 1) - Stock Appreciation Rights (SARs) [Member] - $ / shares
3 Months Ended
May 31, 2018
Feb. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 144,435 148,513
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 43.26 $ 43.29
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments, Number of Shares [Roll Forward]    
Granted (shares) 0  
Exercised (shares) (4,078)  
Forfeited (shares) 0  
Exercisable as of May 31, 2018 144,435  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument, Weighted Average Grant Date Fair Value [Roll Forward]    
Granted, Weighted Average Exercise Price (usd per share) $ 0.00  
Exercised, Weighted Average Exercise Price (usd per share) 44.42  
Forfeited, Weighted Average Exercise Price (usd per share) 0.00  
Exercisable as of May 31, 2018 $ 43.26