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Share-Based Compensation Plans (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 24, 2008
shares
Feb. 28, 2018
USD ($)
item
$ / shares
shares
Feb. 28, 2017
USD ($)
$ / shares
shares
Feb. 29, 2016
USD ($)
$ / shares
shares
Feb. 28, 2015
shares
Share-based compensation plans          
Number of active share-based compensation plans | item   3      
Options granted (in shares)   0      
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   (1,160,556)      
Less restricted share awards previously vested and settled   (638,565)      
Subtotal   1,950,879      
Less maximum RSU's issuable upon vesting   (136,253)      
Less estimated maximum PSU's issuable upon vesting   (348,126)      
Shares available for issuance   1,466,500      
Number of shares available for future issue under the plan   1,466,500      
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   90,517      
Number of shares available for future issue under the plan   90,517      
Restricted stock (RSA)          
Restricted stock disclosure          
Shares, Issued   84,483      
Restricted stock (RSA) | 2008 Stock Incentive Plan          
Share-based compensation plans          
Grant date fair value (in dollars per share) | $ / shares       $ 89.12  
Number of awards vested (in shares)       2,000  
Restricted stock (RSA) | 2008 Directors Plan          
Share-based compensation plans          
Fair value for grants (in dollars per share) | $ / shares   $ 92.95      
Number of awards granted (in shares)   5,658 5,285 5,649  
Grant date fair value (in dollars per share) | $ / shares     $ 92.98 $ 87.04  
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   16,098 32,110 28,433  
Restricted stock disclosure          
Shares originally authorized   350,000      
Shares available for issuance   50,444      
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   $ 76.76 $ 76.77 $ 67.77  
Number of shares available for future issue under the plan   50,444      
Stock Option Officers Employees and Consultants          
Share-based compensation plans          
Options granted (in shares)     2,000 186,000  
Fair value for grants (in dollars per share) | $ / shares     $ 28.74 $ 28.82  
Options outstanding   300,000 448,000 649,000 768,000
Stock Option Officers Employees and Consultants | 2008 Stock Incentive Plan          
Share-based compensation plans          
Options outstanding   298,602      
Stock Option Officers Employees and Consultants | Certain officers and employees | 1998 Plan          
Share-based compensation plans          
Options outstanding   1,200      
Restricted Stock Units (RSU)          
Share-based compensation plans          
Number of awards granted (in shares)   262,000 162,000 95,000  
Grant date fair value (in dollars per share) | $ / shares   $ 96.44 $ 96.90 $ 76.62  
Number of awards vested (in shares)     53,000 0  
Restricted stock disclosure          
Less restricted share awards previously vested and settled   192,002 15,643    
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)   82,356 92,329 29,932  
Grant date fair value (in dollars per share) | $ / shares   $ 95.36 $ 96.74 $ 76.62  
Performance Restricted Stock Units (PSU) | 2008 Stock Incentive Plan          
Share-based compensation plans          
Number of awards granted (in shares)   140,658 139,846 130,608  
Grant date fair value (in dollars per share) | $ / shares   $ 96.52 $ 97.12 $ 76.62  
Restricted stock disclosure          
Performance period (in years)   3 years      
SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based compensation expense | $   $ 15,279 $ 14,047 $ 7,350  
Less income tax benefits | $   (1,669) (1,762) (753)  
Share-based payment expense, net of income tax benefits | $   $ 13,610 $ 12,285 $ 6,597  
Continuing operations earnings per share impact of share-based compensation expense:          
Basic (in dollars per share) | $ / shares   $ 0.50 $ 0.45 $ 0.23  
Diluted (in dollars per share) | $ / shares   $ 0.50 $ 0.44 $ 0.23  
SG&A | Share-based compensation | Directors          
SHARE-BASED PAYMENT EXPENSE          
Share-based compensation expense | $   $ 750 $ 700 $ 700  
SG&A | Performance-based and other stock awards          
SHARE-BASED PAYMENT EXPENSE          
Share-based compensation expense | $   12,631 10,243 3,235  
SG&A | Employee stock purchase plan          
SHARE-BASED PAYMENT EXPENSE          
Share-based compensation expense | $   264 490 552  
SG&A | Stock Option Officers Employees and Consultants          
SHARE-BASED PAYMENT EXPENSE          
Share-based compensation expense | $   $ 1,634 $ 2,614 $ 2,863  
Minimum | Stock Option Officers Employees and Consultants | 2008 Stock Incentive Plan          
Share-based compensation plans          
Vesting period   4 years      
Term of award   7 years      
Restricted stock disclosure          
Vesting period   4 years      
Minimum | Stock Option Officers Employees and Consultants | Certain officers and employees | 1998 Plan          
Share-based compensation plans          
Vesting period 4 years        
Term of award 7 years        
Restricted stock disclosure          
Vesting period 4 years        
Maximum | Stock Option Officers Employees and Consultants | 2008 Stock Incentive Plan          
Share-based compensation plans          
Vesting period   5 years      
Term of award   10 years      
Restricted stock disclosure          
Vesting period   5 years      
Maximum | Stock Option Officers Employees and Consultants | Certain officers and employees | 1998 Plan          
Share-based compensation plans          
Vesting period 5 years        
Term of award 10 years        
Restricted stock disclosure          
Vesting period 5 years        
Maximum | Restricted Stock Units (RSU) | CEO and certain members of management team | 2008 Stock Incentive Plan          
Share-based compensation plans          
Vesting period   4 years      
Restricted stock disclosure          
Vesting period   4 years