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STOCK-BASED COMPENSATION PLANS (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ 5,790 $ 8,557 $ 10,007 $ 13,338
Equity method awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     1,505,000 1,201,000
Weighted average grant-date fair value     $ 17.75 $ 20.71
Liability method awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     374,000 323,000
Equivalent shares outstanding 718,223   718,223  
Equivalent shares expected to vest 683,922   683,922  
Fiscal 2019 | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years  
Fiscal 2019 | Cliff vesting restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years  
Fiscal 2019 | Performance Stock Units (PSU)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years