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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Nov. 30, 2015
Aug. 31, 2015
May. 31, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
SHARE-BASED PAYMENT EXPENSE            
Less income tax benefits $ (396)     $ (141) $ (989) $ (514)
Share-based payment expense, net of income tax benefits $ 1,865     $ 1,239 $ 5,314 $ 4,218
Earnings per share impact of share-based payment expense:            
Basic (in dollars per share) $ 0.07     $ 0.04 $ 0.19 $ 0.15
Diluted (in dollars per share) $ 0.07     $ 0.04 $ 0.18 $ 0.15
SG&A            
SHARE-BASED PAYMENT EXPENSE            
Share-based payment expense $ 2,261     $ 1,380 $ 6,303 $ 4,732
Certain officers and employees            
Share-based compensation plans            
Options granted (in shares) 4,500       167,000  
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)         1.46%  
Expected dividend rate (as a percent)         0.00%  
Range of expected volatility rates used, minimum (as a percent)         36.77%  
Range of expected volatility rates used, maximum (as a percent)         39.72%  
Exercise of stock options (in shares) 29,602       175,056  
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)         $ 31.41  
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) 1,498       4,459  
Grant date fair value $ 120       $ 370  
Grant date fair value (in dollars per share) $ 82.04       $ 82.64  
Share-based compensation. | Directors | SG&A            
SHARE-BASED PAYMENT EXPENSE            
Share-based payment expense $ 175     175 $ 525 641
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 1,368     336 3,500 1,441
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
Stock Option Officers Employees and Consultants | SG&A            
SHARE-BASED PAYMENT EXPENSE            
Share-based payment expense $ 718     $ 869 $ 2,055 $ 2,483