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STOCK-BASED COMPENSATION PLANS (Narrative) (Details)
$ in Millions
12 Months Ended
Aug. 31, 2021
USD ($)
Interval
shares
Aug. 31, 2020
USD ($)
shares
Aug. 31, 2019
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense | $ $ 43.7 $ 31.9 $ 25.1
Total unrecognized compensation cost | $ $ 13.7    
Period of unrecognized compensation to be recognized 3 years    
Shares available for future grants 5,264,516    
Fair value of shares vested | $ $ 25.6 $ 26.7 $ 19.9
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards and performance stock units, granted, shares 847,872 997,454 889,238
Restricted stock units | United States      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting frequency | Interval 3    
Performance Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards and performance stock units, granted, shares 406,098 536,022 483,984
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 323,880 425,915  
Equivalent number of awards outstanding 711,148    
Equivalent number of shares expected to vest 675,590    
Employee stock purchase plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants 1,950,664    
Maximum number of shares per employee 500    
Purchase discount from market price 15.00% 15.00% 15.00%