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STOCK-BASED COMPENSATION PLANS (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 8,269 $ 4,217
Equity method awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares granted 1,465,000 1,454,000
Weighted average grant-date fair value $ 18.15 $ 17.81
Liability method awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares granted 426,000 374,000
Equivalent shares outstanding 836,546  
Equivalent shares expected to vest 794,719  
Fiscal 2020 | Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period in years 3 years  
Fiscal 2020 | Performance Stock Units (PSU)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period in years 3 years