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SHARE-BASED COMPENSATION PLANS (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 22, 2014
$ / shares
shares
Feb. 28, 2014
$ / shares
shares
Apr. 22, 2013
$ / shares
shares
Aug. 24, 2008
shares
Apr. 30, 2014
shares
Feb. 29, 2016
item
$ / shares
shares
Feb. 29, 2016
USD ($)
item
$ / shares
shares
Feb. 28, 2015
USD ($)
$ / shares
shares
Feb. 28, 2014
USD ($)
$ / shares
shares
Feb. 28, 2013
shares
Share-based compensation plans                    
Number of active share-based compensation plans | item           3 3      
SHARE-BASED PAYMENT EXPENSE                    
Less income tax benefits | $             $ (1,284) $ (661) $ (5,709)  
Share-based payment expense, net of income tax benefits | $             $ 7,407 $ 5,557 $ 26,160  
Earnings per share impact of share-based payment expense:                    
Basic (in dollars per share) | $ / shares             $ 0.26 $ 0.19 $ 0.82  
Diluted (in dollars per share) | $ / shares             $ 0.26 $ 0.19 $ 0.81  
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 3,750,000      
Restricted stock disclosure                    
Shares originally authorized           3,750,000 3,750,000      
Less cumulative stock option grants issued, net of forfeitures             (1,213,822)      
Less restricted share awards previously vested and settled             (423,970)      
Subtotal           2,112,208 2,112,208      
Less maximum RSU's issuable upon vesting             (57,364)      
Less estimated maximum PSU's issuable upon vesting             (306,206)      
Shares available for issuance           1,748,638 1,748,638      
Number of shares available for future issue under the plan           1,748,638 1,748,638      
2008 Directors Plan                    
Share-based compensation plans                    
Number of shares of common stock covered for issuance under share-based compensation plan           175,000 175,000      
Restricted stock disclosure                    
Shares originally authorized           175,000 175,000      
Shares available for issuance           101,460 101,460      
Number of shares available for future issue under the plan           101,460 101,460      
SG&A                    
SHARE-BASED PAYMENT EXPENSE                    
Share-based payment expense | $             $ 8,691 $ 6,218 $ 31,869  
Former Chief Executive Officer | Separation agreement                    
SHARE-BASED PAYMENT EXPENSE                    
Share-based payment expense | $                 $ 15,000  
Employees                    
Share-based compensation plans                    
Number of shares withheld for the federal tax obligations           1,282        
Restricted stock (RSA)                    
Share-based compensation plans                    
Vested and settled or exercised, Vested and settled (in shares)         62,304          
Restricted stock (RSA) | 2008 Stock Incentive Plan                    
Share-based compensation plans                    
Number of awards granted (in shares)             2,000   62,000  
Grant date fair value (in dollars per share) | $ / shares             $ 89.12 $ 67.10 $ 67.10  
Vested and settled or exercised, Vested and settled (in shares)             2,000 62,000 160,000  
Vested and settled or exercised, fair value (in dollars per share) | $ / shares             $ 89.12   $ 35.55  
Restricted stock (RSA) | 2008 Directors Plan                    
Share-based compensation plans                    
Number of awards granted (in shares)             5,649 9,267 10,512  
Grant date fair value (in dollars per share) | $ / shares             $ 87.04 $ 61.72 $ 41.26  
Restricted stock disclosure                    
Shares, Issued           73,540 73,540      
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      
Share-based compensation. | Directors | SG&A                    
SHARE-BASED PAYMENT EXPENSE                    
Share-based payment expense | $             $ 700 $ 816 $ 619  
Share-based compensation. | Former Chief Executive Officer | SG&A | Separation agreement                    
SHARE-BASED PAYMENT EXPENSE                    
Share-based payment expense | $                 15,000  
Performance-based and other stock awards | SG&A                    
SHARE-BASED PAYMENT EXPENSE                    
Share-based payment expense | $             $ 4,478 $ 1,732 $ 13,446  
Employee stock purchase plan                    
Share-based compensation plans                    
Number of shares of common stock covered for issuance under share-based compensation plan           350,000 350,000      
Shares of common stock acquired by plan participants             28,433 31,128 41,328  
Restricted stock disclosure                    
Shares originally authorized           350,000 350,000      
Shares available for issuance           98,652 98,652      
Maximum withholding percentage of employee wages or salaries for the purchase of shares of common stock           15.00% 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   $ 32.66       $ 67.77 $ 67.77 $ 49.49 $ 32.66  
Number of shares available for future issue under the plan           98,652 98,652      
Employee stock purchase plan | SG&A                    
SHARE-BASED PAYMENT EXPENSE                    
Share-based payment expense | $             $ 552 $ 391 $ 424  
Stock Option Officers Employees and Consultants                    
Share-based compensation plans                    
Options granted (in shares)             186,000 257,000 264,000  
Fair value for grants (in dollars per share) | $ / shares             $ 28.82 $ 25.22 $ 11.61  
Range of risk free interest rates used, minimum (as a percent)             0.90% 1.20% 0.60%  
Range of risk free interest rates used, maximum (as a percent)             1.50% 1.50% 1.30%  
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% 34.00%  
Range of expected volatility rates used, maximum (as a percent)             39.70% 50.50% 41.70%  
Exercise of stock options (in shares)             178,000 187,000 239,000  
Options outstanding   839,000       649,000 649,000 768,000 839,000 864,000
Stock Option Officers Employees and Consultants | 2008 Stock Incentive Plan                    
Share-based compensation plans                    
Options outstanding           646,775 646,775      
Stock Option Officers Employees and Consultants | SG&A                    
SHARE-BASED PAYMENT EXPENSE                    
Share-based payment expense | $             $ 2,961 $ 3,279 $ 2,380  
Stock Option Officers Employees and Consultants | Minimum                    
Share-based compensation plans                    
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                    
Expected terms used             4 years 4 months 24 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           2,100 2,100      
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)             95,000 118,000    
Grant date fair value (in dollars per share) | $ / shares             $ 76.62   $ 32.88  
Vested and settled or exercised, Vested and settled (in shares)               100,000 100,000  
Vested and settled or exercised, fair value (in dollars per share) | $ / shares               $ 58.35 $ 32.88  
Restricted Stock Units (RSU) | 2008 Stock Incentive Plan                    
Share-based compensation plans                    
Number of awards granted (in shares)             29,932 28,937    
Grant date fair value (in dollars per share) | $ / shares             $ 76.62 $ 58.36    
Restricted Stock Units (RSU) | Vesting period one | 2008 Stock Incentive Plan                    
Restricted stock disclosure                    
Awards currently outstanding vesting percentage             50.00%      
Restricted Stock Units (RSU) | Vesting period two | 2008 Stock Incentive Plan                    
Restricted stock disclosure                    
Awards currently outstanding vesting percentage             50.00%      
Performance Restricted Stock Units (PSU) | 2008 Stock Incentive Plan                    
Share-based compensation plans                    
Number of awards granted (in shares)             130,608 178,101   100,000
Grant date fair value (in dollars per share) | $ / shares   $ 65.31         $ 76.62 $ 58.36    
Vested and settled or exercised, Vested and settled (in shares) 100,000 66,600 33,400              
Vested and settled or exercised, fair value (in dollars per share) | $ / shares $ 67.10   $ 35.55              
Restricted stock disclosure                    
Performance period (in years)             3 years      
Performance Restricted Stock Units (PSU) | Former Chief Executive Officer | 2008 Stock Incentive Plan | Separation agreement                    
Share-based compensation plans                    
Number of awards granted (in shares)                 100,000  
Grant date fair value (in dollars per share) | $ / shares                 $ 32.88