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STOCK-BASED COMPENSATION PLANS (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
May 31, 2018
May 31, 2017
May 31, 2018
May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expenses from stock modification and increase in value $ (100) $ 2,000 $ 1,600 $ 2,700
Stock-based compensation $ 4,910 $ 3,560 $ 18,247 $ 19,716
Equity method awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     1,216,000 916,000
Weighted average grant-date fair value     $ 20.69 $ 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 769,287   769,287  
Equivalent shares expected to vest 733,000   733,000  
Fiscal 2018 | Cliff vesting restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years