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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2017
May 31, 2017
Aug. 31, 2016
Aug. 31, 2017
Aug. 31, 2016
SHARE-BASED PAYMENT EXPENSE          
Less income tax benefits $ (591)   $ (693) $ (1,081) $ (2,214)
Share-based payment expense, net of income tax benefits $ 2,756   $ 2,503 $ 5,517 $ 6,648
Earnings per share impact of share-based payment expense:          
Basic (in dollars per share) $ 0.10   $ 0.09 $ 0.20 $ 0.24
Diluted (in dollars per share) $ 0.10   $ 0.09 $ 0.20 $ 0.24
SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based payment expense $ 3,347   $ 3,196 $ 6,598 $ 8,862
Employee stock options          
Share-based compensation plans          
Exercise of stock options (in shares) 26,811     103,404  
Restricted stock (RSA) | Directors          
Share-based compensation plans          
Number of awards granted (in shares) 1,504     2,928  
Grant date fair value $ 100     $ 300  
Grant date fair value (in dollars per share) $ 93.40     $ 95.86  
Share-based compensation. | Directors | SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based payment expense $ 200   175 $ 400 350
Performance-based and other stock awards | SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based payment expense 2,427   2,096 4,939 6,847
Employee stock purchase plan | SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based payment expense 297   258 297 258
Stock Option Officers Employees and Consultants | SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based payment expense $ 423   $ 667 $ 962 $ 1,407
Restricted Stock Units (RSU)          
Share-based compensation plans          
Options granted (in shares) 3,108        
Number of awards granted (in shares)       72,915  
Grant date fair value (in dollars per share) $ 95.88     $ 95.88  
Vested and settled or exercised, average share rice (in dollars per share) $ 96.24        
Restricted Stock Units (RSU) | Employees          
Share-based compensation plans          
Number of awards granted (in shares) 869     34,135  
Vested and settled or exercised, total grant date fair value $ 100     $ 3,400  
Vested and settled or exercised, fair value (in dollars per share)       $ 98.33  
Performance Stock Units (PSU)          
Share-based compensation plans          
Number of awards granted (in shares) 1,524     66,534  
Grant date fair value (in dollars per share) $ 95.20     $ 96.76  
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