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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2015
May. 31, 2015
Aug. 31, 2014
Aug. 31, 2015
Aug. 31, 2014
SHARE-BASED PAYMENT EXPENSE          
Less income tax benefits $ (274)   $ (246) $ (593) $ (373)
Share-based payment expense, net of income tax benefits $ 1,655   $ 1,737 $ 3,449 $ 2,979
Earnings per share impact of share-based payment expense:          
Basic (in dollars per share) $ 0.06   $ 0.06 $ 0.12 $ 0.10
Diluted (in dollars per share) $ 0.06   $ 0.06 $ 0.12 $ 0.10
SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based payment expense $ 1,929   $ 1,983 $ 4,042 $ 3,352
Certain officers and employees          
Share-based compensation plans          
Options granted (in shares) 17,000     162,500  
Employee stock options          
Share-based compensation plans          
Range of risk free interest rates used, minimum (as a percent)       0.86%  
Range of risk free interest rates used, maximum (as a percent)       1.38%  
Expected dividend rate (as a percent)       0.00%  
Range of expected volatility rates used, minimum (as a percent)       37.26%  
Range of expected volatility rates used, maximum (as a percent)       39.70%  
Exercise of stock options (in shares) 38,629     145,454  
Employee stock options | Minimum          
Share-based compensation plans          
Fair value for grants (in dollars per share)       $ 24.34  
Term of award       4 years  
Expected terms used       4 years 18 days  
Employee stock options | Maximum          
Share-based compensation plans          
Fair value for grants (in dollars per share)       $ 30.06  
Term of award       5 years  
Expected terms used       4 years 4 months 6 days  
Restricted stock (RSA) | Directors          
Share-based compensation plans          
Granted, issued or earned, Awards issued or earned (in shares) 1,386     2,961  
Grant date fair value $ 130     $ 250  
Grant date fair value (in dollars per share) $ 88.45     $ 82.95  
Share-based compensation | Directors | SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based payment expense $ 175   219 $ 350 466
Share-based compensation | CEO          
Share-based compensation plans          
Granted, issued or earned, Awards issued or earned (in shares)   2,000      
Vested and settled or exercised, fair value (in dollars per share)   $ 89.12      
Performance-based and other stock awards | SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based payment expense 887   687 $ 2,132 1,105
Employee stock purchase plan          
Share-based compensation plans          
Number of shares purchased by employees       12,155  
Value of shares purchased by employees       $ 790  
Employee stock purchase plan | SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based payment expense 223   167 223 167
Stock Option Officers Employees and Consultants | SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based payment expense $ 644   $ 910 $ 1,337 $ 1,614