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Share-Based Compensation Plans (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Apr. 22, 2014
$ / shares
Aug. 24, 2008
shares
Feb. 28, 2017
USD ($)
item
$ / shares
shares
Feb. 29, 2016
USD ($)
$ / shares
shares
Feb. 28, 2015
USD ($)
$ / shares
shares
Feb. 28, 2014
shares
Share-based compensation plans            
Number of active share-based compensation plans | item     3      
Range of expected terms used     4 years 1 month 6 days      
Range of risk free interest rates used, minimum (as a percent)       0.90% 1.20%  
Range of risk free interest rates used, maximum (as a percent)       1.50% 1.50%  
Expected dividend rate (as a percent)     0.00% 0.00% 0.00%  
Range of expected volatility rates used, minimum (as a percent)       35.90% 35.30%  
Range of expected volatility rates used, maximum (as a percent)       39.70% 50.50%  
SHARE-BASED PAYMENT EXPENSE            
Less income tax benefits | $     $ (2,396) $ (1,284) $ (661)  
Share-based payment expense, net of income tax benefits | $     $ 13,310 $ 7,407 $ 5,557  
Earnings per share impact of share-based payment expense:            
Basic (in dollars per share) | $ / shares     $ 0.48 $ 0.26 $ 0.19  
Diluted (in dollars per share) | $ / shares     $ 0.48 $ 0.26 $ 0.19  
1998 Plan            
Share-based compensation plans            
Number of shares of common stock covered for issuance under share-based compensation plan   6,750,000        
Restricted stock disclosure            
Shares originally authorized   6,750,000        
2008 Stock Incentive Plan            
Share-based compensation plans            
Number of shares of common stock covered for issuance under share-based compensation plan     3,750,000      
Restricted stock disclosure            
Shares originally authorized     3,750,000      
Less cumulative stock option grants issued, net of forfeitures     (1,182,894)      
Less restricted share awards previously vested and settled     (439,613)      
Subtotal     2,127,493      
Less maximum RSU's issuable upon vesting     (123,425)      
Less estimated maximum PSU's issuable upon vesting     (396,312)      
Shares available for issuance     1,607,756      
Number of shares available for future issue under the plan     1,607,756      
2008 Directors Plan            
Share-based compensation plans            
Number of shares of common stock covered for issuance under share-based compensation plan     175,000      
Restricted stock disclosure            
Shares originally authorized     175,000      
Shares available for issuance     96,175      
Number of shares available for future issue under the plan     96,175      
SG&A            
SHARE-BASED PAYMENT EXPENSE            
Share-based payment expense | $     $ 15,706 $ 8,691 $ 6,218  
Minimum            
Share-based compensation plans            
Range of expected terms used       4 years 1 month 6 days 4 years 1 month 6 days  
Maximum            
Share-based compensation plans            
Range of expected terms used       4 years 4 months 24 days 4 years 4 months 24 days  
Restricted stock (RSA) | 2008 Stock Incentive Plan            
Share-based compensation plans            
Grant date fair value (in dollars per share) | $ / shares       $ 89.12 $ 67.10  
Vested and settled or exercised, Vested and settled (in shares)       2,000 62,000  
Restricted stock (RSA) | 2008 Directors Plan            
Share-based compensation plans            
Number of awards granted (in shares)     5,285 5,649 9,267  
Grant date fair value (in dollars per share) | $ / shares     $ 92.98 $ 87.04 $ 61.72  
Restricted stock disclosure            
Shares, Issued     78,825      
Restricted stock (RSA) | Former Chief Executive Officer | 2008 Stock Incentive Plan            
Share-based compensation plans            
Vested and settled or exercised, Vested and settled (in shares)           62,304
Vested and settled or exercised, fair value (in dollars per share) | $ / shares     $ 67.10      
Restricted stock (RSA) | CEO | 2008 Stock Incentive Plan            
Share-based compensation plans            
Options granted (in shares)       2,000    
Fair value for grants (in dollars per share) | $ / shares       $ 89.12    
Share-based compensation. | Directors | SG&A            
SHARE-BASED PAYMENT EXPENSE            
Share-based payment expense | $     $ 700 $ 700 $ 816  
Performance-based and other stock awards | SG&A            
SHARE-BASED PAYMENT EXPENSE            
Share-based payment expense | $     $ 11,812 $ 4,478 $ 1,732  
Employee stock purchase plan            
Share-based compensation plans            
Number of shares of common stock covered for issuance under share-based compensation plan     350,000      
Shares of common stock acquired by plan participants     32,110 28,433 31,128  
Restricted stock disclosure            
Shares originally authorized     350,000      
Shares available for issuance     66,542      
Maximum withholding percentage of employee wages or salaries for the purchase of shares of common stock     15.00%      
Purchase price for shares acquired under the plan as a percentage of the share's fair market value     85.00%      
Price of common stock acquired by plan participants (in dollars per share) | $ / shares     $ 76.77 $ 67.77 $ 49.49  
Number of shares available for future issue under the plan     66,542      
Employee stock purchase plan | SG&A            
SHARE-BASED PAYMENT EXPENSE            
Share-based payment expense | $     $ 580 $ 552 $ 391  
Stock Option Officers Employees and Consultants            
Share-based compensation plans            
Options granted (in shares)     2,000 186,000 257,000  
Fair value for grants (in dollars per share) | $ / shares     $ 28.74 $ 28.82 $ 25.22  
Range of risk free interest rates used, minimum (as a percent)     1.20% 0.90% 1.20%  
Range of risk free interest rates used, maximum (as a percent)     1.20% 1.50% 1.50%  
Expected dividend rate (as a percent)     0.00% 0.00% 0.00%  
Range of expected volatility rates used, minimum (as a percent)     33.40% 35.90% 35.30%  
Range of expected volatility rates used, maximum (as a percent)     33.40% 39.70% 50.50%  
Exercise of stock options (in shares)     170,000 178,000 187,000  
Options outstanding     448,000 649,000 768,000 839,000
Stock Option Officers Employees and Consultants | 2008 Stock Incentive Plan            
Share-based compensation plans            
Options outstanding     447,137      
Stock Option Officers Employees and Consultants | SG&A            
SHARE-BASED PAYMENT EXPENSE            
Share-based payment expense | $     $ 2,614 $ 2,961 $ 3,279  
Stock Option Officers Employees and Consultants | Minimum            
Share-based compensation plans            
Range of expected terms used     4 years 1 month 6 days 4 years 1 month 6 days 4 years 1 month 6 days  
Stock Option Officers Employees and Consultants | Minimum | 2008 Stock Incentive Plan            
Share-based compensation plans            
Vesting period     4 years      
Term of award     7 years      
Restricted stock disclosure            
Vesting period     4 years      
Stock Option Officers Employees and Consultants | Maximum            
Share-based compensation plans            
Range of expected terms used     4 years 1 month 6 days 4 years 4 months 24 days 4 years 4 months 24 days  
Stock Option Officers Employees and Consultants | Maximum | 2008 Stock Incentive Plan            
Share-based compensation plans            
Vesting period     5 years      
Term of award     10 years      
Restricted stock disclosure            
Vesting period     5 years      
Stock Option Officers Employees and Consultants | Certain officers and employees | 1998 Plan            
Share-based compensation plans            
Options outstanding     1,200      
Stock Option Officers Employees and Consultants | Certain officers and employees | Minimum | 1998 Plan            
Share-based compensation plans            
Vesting period   4 years        
Term of award   7 years        
Restricted stock disclosure            
Vesting period   4 years        
Stock Option Officers Employees and Consultants | Certain officers and employees | Maximum | 1998 Plan            
Share-based compensation plans            
Vesting period   5 years        
Term of award   10 years        
Restricted stock disclosure            
Vesting period   5 years        
Restricted Stock Units (RSU)            
Share-based compensation plans            
Number of awards granted (in shares)     162,000 95,000 118,000  
Grant date fair value (in dollars per share) | $ / shares     $ 96.90 $ 76.62 $ 58.35  
Vested and settled or exercised, Vested and settled (in shares)     15,643   100,000  
Vested and settled or exercised, fair value (in dollars per share) | $ / shares     $ 60.28   $ 32.88  
Restricted Stock Units (RSU) | CEO and certain members of management team | 2008 Stock Incentive Plan            
Share-based compensation plans            
Number of awards granted (in shares)     92,329 29,932 28,937  
Grant date fair value (in dollars per share) | $ / shares     $ 96.74 $ 76.62 $ 58.36  
Restricted Stock Units (RSU) | CEO and certain members of management team | Maximum | 2008 Stock Incentive Plan            
Share-based compensation plans            
Vesting period     4 years      
Restricted stock disclosure            
Vesting period     4 years      
Performance Restricted Stock Units (PSU) | 2008 Stock Incentive Plan            
Share-based compensation plans            
Number of awards granted (in shares)     139,846 130,608 178,101  
Grant date fair value (in dollars per share) | $ / shares     $ 97.12 $ 76.62 $ 58.36  
Vested and settled or exercised, fair value (in dollars per share) | $ / shares $ 67.10          
Restricted stock disclosure            
Performance period (in years)     3 years