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CREDIT ARRANGEMENTS (Narrative) (Details) | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2018 USD ($) | May 31, 2017 USD ($) | May 31, 2018 USD ($) | May 31, 2017 USD ($) | May 31, 2018 PLN (zł) | May 31, 2018 USD ($) | Feb. 21, 2018 USD ($) | Aug. 31, 2017 PLN (zł) | Aug. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | May 31, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Document Period End Date |  |  | May 31, 2018 |  |  |  |  |  |  |  |
Interest capitalized | $ 500,000 | $ 2,900,000 | $ 7,300,000 | $ 6,600,000 |  |  |  |  |  |  |
Interest paid |  |  | $ 30,200,000 | $ 41,400,000 |  |  |  |  |  |  |
CMCP |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity |  |  |  |  | zł 225,000,000.000000 | $ 60,950,833.000000 |  | zł 175,000,000 | $ 49,099,377.1393000000 |  |
Stand by letters of credit outstanding amount |  |  |  |  |  | $ 1,700,000 |  |  | 1,300,000 |  |
2027 Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 300,000,000 |
Weighted average interest rate |  |  |  |  | 5.375% | 5.375% |  |  |  | 5.375% |
2026 Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 350,000,000 |  |  |  |  |
Weighted average interest rate |  |  |  |  | 5.75% | 5.75% |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 5,300,000 |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 330,000,000
Weighted average interest rate |  |  |  |  | 4.875% | 4.875% |  |  |  |  | 4.875%
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity |  |  |  |  |  | $ 350,000,000 |  |  |  |  |
Minimum liquidity required |  |  |  |  |  | 150,000,000 |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  | 750,000,000 |  |  |  |  |
Revolving credit facility, amount drawn |  |  |  |  |  | $ 0 |  |  | 0 |  |
Minimum interest coverage ratio |  |  | 2.50 |  |  |  |  |  |  |  |
Maximum debt to capitalization ratio |  |  | 0.60 |  |  |  |  |  |  |  |
Actual interest coverage ratio |  |  |  |  | 7.89 | 7.89 |  |  |  |  |
Actual debt to capitalization ratio |  |  |  |  | 0.45 | 0.45 |  |  |  |  |
Revolving credit facility | 2022 Term Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  | 3.103% | 3.103% |  |  |  |  |
Periodic payments, as percent of original principal amount (percent) |  |  | 1.25% |  |  |  |  |  |  |  |
Stand-by letters of credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity |  |  |  |  |  | $ 50,000,000 |  |  |  |  |
Stand by letters of credit outstanding amount |  |  |  |  |  | $ 3,300,000 |  |  | $ 3,000,000 |  |
2018 Term Loan | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Periodic payments, as percent of original principal amount (percent) |  |  | 1.25% |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 200,000,000 |  |  |  |

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