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STOCK-BASED COMPENSATION PLANS (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2015 | May. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 6.5 | $ 5.3 | $ 18.3 | $ 16.1
Restricted stock units and performance stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted |  |  | 1,100,000 | 1,200,000
Weighted average grant-date fair value |  |  | $ 15.92 | $ 16.90
Liability awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted |  |  | 392,517 | 390,562
Equivalent shares outstanding | 913,712 |  | 913,712 |
Equivalent shares expected to vest | 868,025 |  | 868,025 |
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 | Restricted 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% |
Fiscal 2014 | Performance stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period in years |  |  | 3 years |

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