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STOCK-BASED COMPENSATION PLANS (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
May 31, 2016
May 31, 2015
May 31, 2016
May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 6.8 $ 6.5 $ 19.9 $ 18.3
Restricted stock units and performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     1,600,000 1,100,000
Weighted average grant-date fair value     $ 15.83 $ 15.92
Liability awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     464,782 392,517
Equivalent shares outstanding 914,215   914,215  
Equivalent shares expected to vest 870,224   870,224  
Fiscal 2016 | Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years  
Fiscal 2016 | Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years  
Fiscal 2015 | Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years  
Fiscal 2015 | Certain restricted stock units | Vesting on second anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     33.33%  
Fiscal 2015 | Certain restricted stock units | Vesting on third anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     66.66%  
Fiscal 2015 | Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period in years     3 years  
Fiscal 2014 | Certain restricted stock units | Vesting on second anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     25.00%  
Fiscal 2014 | Certain restricted stock units | Vesting on third anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     25.00%  
Fiscal 2014 | Certain restricted stock units | Vesting on fourth anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     50.00%