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STOCK-BASED COMPENSATION PLANS (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expenses from stock modification and increase in value $ 0.8   $ 4.7  
Share-based compensation expense $ 8.0 $ 6.8 $ 16.2 $ 13.1
Restricted stock units and performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     900,000 1,600,000
Weighted average grant-date fair value     $ 16.04 $ 15.83
Liability awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     914,545 464,782
Equivalent shares outstanding 2,150,652   2,150,652  
Equivalent shares expected to vest 2,100,000   2,100,000  
Fiscal 2015 | Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years  
Fiscal 2015 | Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years