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STOCK-BASED COMPENSATION PLANS (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expenses from stock modification and increase in value $ 1,400 $ 800 $ 1,700 $ 4,700
Share-based compensation expense $ 8,557 $ 7,911 $ 13,338 $ 16,156
Equity method awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     1,201,000 916,000
Weighted average grant-date fair value     $ 20.71 $ 16.04
Liability method awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     323,000 915,000
Equivalent shares outstanding 777,175   777,175  
Equivalent shares expected to vest 741,000   741,000  
Fiscal 2018 | Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years  
Fiscal 2018 | Cliff vesting restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years  
Fiscal 2018 | Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years