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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 18, 2018
Aug. 22, 2018
Aug. 31, 2018
May 31, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Share-based compensation plans              
Exercise of stock options (in shares)     67,417     111,184  
SHARE-BASED PAYMENT EXPENSE              
Share-based payment expense, net of income tax benefits     $ 4,400   $ 2,561 $ 10,506 $ 5,269
Continuing operations earnings per share impact of share-based compensation expense:              
Basic (in dollars per share)     $ 0.17   $ 0.09 $ 0.40 $ 0.19
Diluted (in dollars per share)     $ 0.17   $ 0.09 $ 0.39 $ 0.19
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate   15.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent   85.00%          
Employee Stock Ownership Plan (ESOP), Shares in ESOP   2,000,000          
Directors              
Share-based compensation plans              
Number of awards granted (in shares)     1,358     2,737  
Grant date fair value     $ 100     $ 200  
Grant date fair value (in dollars per share)     $ 90.45     $ 89.78  
Restricted Stock Units (RSU)              
Share-based compensation plans              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     656     37,067  
Number of awards granted (in shares)     1,657     71,798  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised     656     37,067  
Grant date fair value     $ 100     $ 3,300  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 90.45     $ 89.11  
Grant date fair value (in dollars per share)     $ 84.33     $ 86.19  
Performance Restricted Stock Units (PSU)              
Share-based compensation plans              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     1,366     100,404  
Number of awards granted (in shares)     0 76,064      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised     1,366     100,404  
Grant date fair value     $ 200     $ 9,200  
Grant date fair value (in dollars per share)     $ 115.80 $ 86.24   $ 91.14  
SG&A              
SHARE-BASED PAYMENT EXPENSE              
Share-based compensation expense     $ 4,741   $ 3,152 $ 11,117 $ 6,350
Less income tax benefits     (341)   (591) (611) (1,081)
SG&A | Directors              
SHARE-BASED PAYMENT EXPENSE              
Share-based compensation expense     175   200 350 400
SG&A | Employee stock options              
SHARE-BASED PAYMENT EXPENSE              
Share-based compensation expense     219   423 527 962
SG&A | Performance-based and other stock awards              
SHARE-BASED PAYMENT EXPENSE              
Share-based compensation expense     4,347   2,266 9,918 4,725
SG&A | Employee stock purchase plan              
SHARE-BASED PAYMENT EXPENSE              
Share-based compensation expense     $ 0   $ 263 $ 322 $ 263
Maximum              
Continuing operations earnings per share impact of share-based compensation expense:              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award   750,000          
Subsequent Event | Restricted Stock Units (RSU)              
Share-based compensation plans              
Number of awards granted (in shares) 74,100            
Grant date fair value (in dollars per share) $ 125.55