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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2014 USD ($) | May. 31, 2015 USD ($) | Aug. 31, 2015 USD ($) | Aug. 31, 2014 USD ($) | Aug. 31, 2013 USD ($) | Sep. 24, 2008 entities
Loss Contingencies [Line Items] |  |  |  |  |  |
Total rental expense |  |  | $ 52.8 | $ 46.8 | $ 46.6 |
Gain on contract termination |  | $ 45.5 |  |  |  |
Total environmental liabilities |  |  | 4.3 | 6.2 |  |
Long-term environmental liabilities |  |  | 2.4 | 2.3 |  |
Federal court |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of steel manufacturing companies | entities |  |  |  |  |  | 9
Litigation settlement amount | $ 4.0 |  |  |  |  |
CERCLA sites |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total environmental liabilities |  |  | $ 1.0 | $ 0.7 |  |

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