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CREDIT ARRANGEMENTS (Narrative) (Details) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2017 USD ($) | Nov. 30, 2016 USD ($) | Nov. 30, 2017 PLN | Nov. 30, 2017 USD ($) | Aug. 31, 2017 PLN | Aug. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | May 31, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest capitalized | $ 3,800,000 | $ 1,600,000 |  |  |  |  |  |
Interest paid | 9,400,000 | 8,400,000 |  |  |  |  |  |
CMCP |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity |  |  | PLN 225,000,000.0 | $ 63,700,000.0 | PLN 175,000,000.0 | $ 49,100,000.0 |  |
Stand by letters of credit outstanding amount |  |  |  | 1,600,000 |  | 1,300,000 |  |
Revolving credit facility, amount drawn |  |  |  | 0 |  | 0 |  |
Total borrowing | 0 | 0 |  |  |  |  |  |
Total payments | $ 0 | $ 0 |  |  |  |  |  |
2027 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 300,000,000 |  | 300,000,000 | $ 300,000,000 |
Weighted average interest rate |  |  | 5.375% | 5.375% |  |  | 5.375% |
2023 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 330,000,000
Weighted average interest rate |  |  | 4.875% | 4.875% |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 4.875%
Debt instrument, maturity date | May 15, 2023 |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity |  |  |  | $ 350,000,000 |  |  |  |
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 |  |  | 7.06 | 7.06 |  |  |  |
Actual debt to capitalization ratio |  |  | 0.37 | 0.37 |  |  |  |
Revolving credit facility | Term Loan (Due 2022) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | $ 150,000,000 |  | 150,000,000 |  |
Periodic payments, as percent of original principal amount | 1.25% |  |  |  |  |  |  |
Weighted average interest rate |  |  | 2.83% | 2.83% |  |  |  |
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 |  |

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