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STOCK-BASED COMPENSATION PLANS (Narrative) (Details)
$ in Millions
12 Months Ended
Aug. 31, 2020
USD ($)
Interval
shares
Aug. 31, 2019
USD ($)
Interval
shares
Aug. 31, 2018
USD ($)
Interval
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense | $ $ 31.9 $ 25.1 $ 23.9
Total unrecognized compensation cost | $ $ 16.7    
Period of unrecognized compensation to be recognized 3 years    
Shares available for future grants 5,669,972    
Fair value of shares vested | $ $ 26.7 $ 19.9 $ 30.3
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards and performance stock units, granted, shares 997,454 889,238 667,341
Restricted stock units | United States      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting frequency | Interval 3    
Restricted stock units | Non-U.S.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting frequency | Interval 3 3 3
Performance Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards and performance stock units, granted, shares 536,022 483,984 367,514
Performance Awards | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout percentage 50.00%    
Performance Awards | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout percentage 200.00%    
Performance Awards | EBITDA      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage that performance targets are weighted 75.00% 75.00% 75.00%
Performance Awards | Relative total stockholder return      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage that performance targets are weighted 25.00% 25.00% 25.00%
Liability awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards and performance stock units, granted, shares 425,915 374,281  
Equivalent number of awards outstanding 773,757    
Equivalent number of shares expected to vest 735,069    
Employee stock purchase plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants 2,338,304    
Maximum number of shares per employee 500    
Purchase discount from market price 15.00% 15.00% 15.00%