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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
May 31, 2017
May 31, 2016
SHARE-BASED PAYMENT EXPENSE    
Less income tax benefits $ (490) $ (1,521)
Share-based payment expense, net of income tax benefits $ 2,761 $ 4,145
Earnings per share impact of share-based payment expense:    
Basic (in dollars per share) $ 0.10 $ 0.15
Diluted (in dollars per share) $ 0.10 $ 0.15
SG&A    
SHARE-BASED PAYMENT EXPENSE    
Share-based payment expense $ 3,251 $ 5,666
Employee stock options    
Share-based compensation plans    
Exercise of stock options (in shares) 76,593  
Restricted stock (RSA) | Directors    
Share-based compensation plans    
Number of awards granted (in shares) 1,424  
Grant date fair value $ 100  
Grant date fair value (in dollars per share) $ 98.45  
Share-based compensation. | Directors | SG&A    
SHARE-BASED PAYMENT EXPENSE    
Share-based payment expense $ 200 175
Performance-based and other stock awards | SG&A    
SHARE-BASED PAYMENT EXPENSE    
Share-based payment expense 2,512 4,751
Stock Option Officers Employees and Consultants | SG&A    
SHARE-BASED PAYMENT EXPENSE    
Share-based payment expense $ 539 $ 740
Restricted Stock Units (RSU)    
Share-based compensation plans    
Options granted (in shares) 69,807  
Fair value for grants (in dollars per share) $ 95.87  
Vested and settled or exercised, Vested and settled (in shares) 33,266  
Vested and settled or exercised, total grant date fair value $ 3,300  
Vested and settled or exercised, average share rice (in dollars per share) $ 98.39  
Performance Stock Units (PSU)    
Share-based compensation plans    
Options granted (in shares) 65,010  
Fair value for grants (in dollars per share) $ 96.80  
Vested and settled or exercised, Vested and settled (in shares) 149,884  
Vested and settled or exercised, total grant date fair value $ 14,300  
Vested and settled or exercised, average share rice (in dollars per share) $ 95.55