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CREDIT ARRANGEMENTS (Narrative) (Details) | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2018 USD ($) | Aug. 31, 2019 USD ($) | Aug. 31, 2018 USD ($) | Aug. 31, 2017 USD ($) | Aug. 31, 2019 PLN (zł) | May 31, 2019 USD ($) | Aug. 31, 2018 PLN (zł) | Jul. 31, 2017 USD ($) | Jun. 26, 2014 USD ($) | May 31, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest costs capitalized |  | $ 300,000 | $ 7,300,000 | $ 9,800,000 |  |  |  |  |  |
CMCP |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 69,000,000.0 | 60,800,000 |  | zł 275,000,000.0 |  | zł 225,000,000.0 |  |  |
Stand by letters of credit outstanding amount |  | 1,100,000 | 1,100,000 |  |  |  |  |  |  |
Revolving line of credit outstanding amount |  | 0 | 0 |  |  |  |  |  |  |
Borrowings under uncommitted lines of credit |  | 0 | 0 | 0 |  |  |  |  |  |
Repayments of uncommitted credit lines |  | 0 | 0 | $ 0 |  |  |  |  |  |
Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 350,000,000.0 |
Revolving credit facility, maximum borrowing capacity |  | $ 600,000,000.0 |  |  |  |  |  |  |  |
Minimum interest coverage ratio |  | 2.50 |  |  |  |  |  |  |  |
Maximum debt to capitalization ratio |  | 0.60 |  |  |  |  |  |  |  |
Actual interest coverage ratio |  | 5.93 |  |  | 5.93 |  |  |  |  |
Actual debt to capitalization ratio |  | 0.44 |  |  | 0.44 |  |  |  |  |
Stand-by letters of credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 50,000,000.0 |  |  |  |  |  |  |  |
Stand by letters of credit outstanding amount |  | $ 3,000,000.0 | $ 3,300,000 |  |  |  |  |  |  |
2027 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  | 5.375% |  |  | 5.375% |  |  | 5.375% |  |
Term loan, maximum principal amount |  |  |  |  |  |  |  | $ 300,000,000.0 |  |
2026 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  | 5.75% |  |  | 5.75% | 5.75% |  |  |  |
Term loan, maximum principal amount |  |  |  |  |  | $ 350,000,000.0 |  |  |  |
Debt issuance costs | $ 5,300,000 |  |  |  |  |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  | 4.875% |  |  | 4.875% |  |  |  |  | 4.875%
Term loan, maximum principal amount |  |  |  |  |  |  |  |  |  | $ 330,000,000.0
Term Loan | Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  | 4.111% |  |  | 4.111% |  |  |  |  |
Term loan, maximum principal amount |  | $ 150,000,000.0 |  |  |  |  |  |  |  |
U.S. Program |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Transfer of Accounts Receivable Program, Face Amount |  | $ 200,000,000.0 |  |  |  |  |  |  |  |
U.S. Program | Short-term borrowings |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  | 3.461% |  |  | 3.461% |  |  |  |  |
Poland Program |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Transfer of Accounts Receivable Program, Face Amount |  | $ 55,200,000 |  |  | zł 220,000,000.0 |  |  |  |  |
Advance Limit as Percent of Eligible Trade Accounts Receivable Transferred |  | 90.00% |  |  | 90.00% |  |  |  |  |
Transfers of Accounts Receivable Outstanding |  | $ 3,900,000 |  |  |  |  |  |  |  |
Poland Program | Short-term borrowings |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  | 2.41% |  |  | 2.41% |  |  |  |  |
Term Loan A Facility | Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Quarterly payments, as percent of original principal amount (percent) | 1.25% |  |  |  |  |  |  |  |  |
U.S. Program with Consent of CMCRV and Program Administrative Agent |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Transfer of Accounts Receivable Program, Face Amount |  | $ 300,000,000.0 |  |  |  |  |  |  |  |

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