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STOCK-BASED COMPENSATION PLANS (Narrative) (Details) $ in Millions | 12 Months Ended
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Aug. 31, 2015 USD ($) Interval shares | Aug. 31, 2014 USD ($) shares | Aug. 31, 2013 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ | $ 23.5 | $ 18.1 | $ 18.7
Total unrecognized compensation cost | $ | $ 21.9 |  |
Period of unrecognized compensation to be recognized | 3 years |  |
Shares available for future grants | 12,744,798 |  |
Fair value of shares vested | $ | $ 10.2 | $ 10.0 | $ 7.2
Certain RSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period of unrecognized compensation to be recognized | 4 years |  |
Restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awards and performance stock units, granted, shares | 987,574 | 1,191,544 | 1,149,696
Restricted stock units | United States |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting frequency | Interval | 3 |  |
Vesting period | 3 years |  |
Restricted stock units | Non-U.S. |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting frequency | Interval | 3 |  |
Vesting period | 3 years |  |
Performance stock units awarded in fiscal 2013 | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Payout percentage | 50.00% |  |
Performance stock units awarded in fiscal 2013 | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Payout percentage | 200.00% |  |
Performance stock units awarded in fiscal 2013 | EBITDA |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage that performance targets are weighted | 75.00% | 75.00% | 75.00%
Performance stock units awarded in fiscal 2013 | Relative total stockholder return |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage that performance targets are weighted | 25.00% | 25.00% | 25.00%
Liability awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awards and performance stock units, granted, shares | 392,517 | 390,562 |
Equivalent number of awards outstanding | 898,259 |  |
Equivalent number of shares expected to vest | 853,345 |  |
Stock appreciation rights and stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  |  | 3 years
Stock appreciation rights and stock options, granted, number | 0 | 0 | 244,403
Equivalent shares of SARs outstanding | 842,217 |  |
Stock appreciation rights and stock options, contractual term |  |  | 7 years
Fair value of stock appreciation rights and stock options granted | $ |  |  | $ 0.6
Cash-settled stock appreciation rights |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock appreciation rights and stock options, granted, number | 0 | 0 | 59,399
Equivalent shares of SARs outstanding | 72,439 |  |
Equivalent number of shares expected to vest | 68,817 |  |
Employee stock purchase plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares per employee | 400 |  |
Purchase discount from market price | 15.00% | 15.00% | 15.00%
Vesting in two years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 50.00% |  |
Vesting period | 4 years |  |
Vesting in three years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 25.00% |  |
Vesting period | 3 years |  |
Vesting in four years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 25.00% |  |
Vesting period | 2 years |  |

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