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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Aug. 22, 2018
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
Share-based compensation plans          
Exercise of stock options (in shares)   9,584   120,768  
SHARE-BASED PAYMENT EXPENSE          
Share-based payment expense, net of income tax benefits   $ 5,678 $ 3,660 $ 16,184 $ 8,929
Impact of share-based compensation on earnings per share from continuing operations:          
Basic (in dollars per share)   $ 0.22 $ 0.13 $ 0.61 $ 0.33
Diluted (in dollars per share)   $ 0.22 $ 0.13 $ 0.61 $ 0.33
Shares purchased under ESPP (in shares)   14,222      
Maximum percentage of wage or salary withholding by employees 15.00%        
Share purchase price percentage of fair market value 85.00%        
Aggregate number of shares issued (in shares) 2,000,000        
Shares remaining for issuance (in shares)   1,922,806   1,922,806  
Directors          
Share-based compensation plans          
Number of awards granted (in shares)   1,160   3,897  
Grant date fair value   $ 100   $ 300  
Grant date fair value of shares granted in period (in dollars per share)   $ 120.70   $ 100.08  
Restricted Stock Units (RSU)          
Share-based compensation plans          
Shares vested in period (in shares)   875   37,942  
Number of awards granted (in shares)   77,834   149,632  
Shares settled in period (in shares)   875   37,942  
Grant date fair value   $ 100   $ 3,400  
Grant date fair value of RSUs settled in period (in dollars per share)   $ 126.99   $ 89.55  
Grant date fair value of shares granted in period (in dollars per share)   $ 125.44   $ 106.67  
Performance Restricted Stock Units (PSU)          
Share-based compensation plans          
Shares vested in period (in shares)   2,213   102,617  
Number of awards granted (in shares)       76,064  
Shares settled in period (in shares)   2,213   102,617  
Grant date fair value   $ 300   $ 9,400  
Grant date fair value of shares granted in period (in dollars per share)   $ 126.94   $ 86.24  
SG&A          
SHARE-BASED PAYMENT EXPENSE          
Share-based compensation expense   $ 6,076 $ 4,441 $ 17,193 $ 10,791
Less income tax benefits   (398) (781) (1,009) (1,862)
SG&A | Directors          
SHARE-BASED PAYMENT EXPENSE          
Share-based compensation expense   200 175 550 575
SG&A | Employee stock options          
SHARE-BASED PAYMENT EXPENSE          
Share-based compensation expense   128 327 655 1,289
SG&A | Performance-based and other stock awards          
SHARE-BASED PAYMENT EXPENSE          
Share-based compensation expense   5,419 3,939 15,337 8,664
SG&A | Employee stock purchase plan          
SHARE-BASED PAYMENT EXPENSE          
Share-based compensation expense   329 $ 0 651 $ 263
Time-Vested | Restricted Stock Units (RSU)          
Share-based compensation plans          
Grant date fair value   $ 9,800   16,000  
Unvested | Performance Restricted Stock Units (PSU)          
Share-based compensation plans          
Grant date fair value       $ 6,600  
Vested and settled performance shares | Performance Restricted Stock Units (PSU)          
Share-based compensation plans          
Grant date fair value of shares granted in period (in dollars per share)       $ 91.88  
Maximum          
Impact of share-based compensation on earnings per share from continuing operations:          
Shares purchased under ESPP (in shares) 750,000