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CREDIT ARRANGEMENTS (Narrative) (Details) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) | Aug. 31, 2019 USD ($) | Aug. 31, 2018 USD ($) | Aug. 31, 2020 PLN (zł) | May 31, 2020 | Nov. 01, 2018 USD ($) | May 31, 2018 USD ($) | Jul. 31, 2017 USD ($) | May 31, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on debt extinguishment | $ (1,778,000) | $ 0 | $ 0 |  |  |  |  |  |
Total long-term debt including current maturities | 1,092,266,000 | 1,254,921,000 |  |  |  |  |  |  |
Interest costs capitalized | 2,500,000 | 300,000 | 7,300,000 |  |  |  |  |  |
CMCP |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 74,600,000 | 69,000,000.0 |  | zł 275,000,000.0 |  |  |  |  |
Revolving line of credit outstanding amount | 0 | 0 |  |  |  |  |  |  |
Stand by letters of credit outstanding amount | 800,000 | 1,100,000 |  |  |  |  |  |  |
Borrowings under uncommitted lines of credit | 22,400,000 | 0 | 0 |  |  |  |  |  |
Repayments of uncommitted credit lines | 22,400,000 | 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 |  |  |  |  |  |  |  |
Revolving line of credit outstanding amount | $ 0 | 0 |  |  |  |  |  |  |
Minimum interest coverage ratio | 2.50 |  |  |  |  |  |  |  |
Maximum debt to capitalization ratio | 0.60 |  |  |  |  |  |  |  |
Actual interest coverage ratio | 9.36 |  |  | 9.36 |  |  |  |  |
Actual debt to capitalization ratio | 0.37 |  |  | 0.37 |  |  |  |  |
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 | 3,000,000.0 |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total long-term debt including current maturities | $ 0 | 3,929,000 |  |  |  |  |  |  |
2027 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Term loan, maximum principal amount |  |  |  |  |  |  |  | $ 300,000,000.0 |
Weighted average interest rate | 5.375% |  |  | 5.375% |  |  |  | 5.375% |
Total long-term debt including current maturities | $ 300,000,000 | 300,000,000 |  |  |  |  |  |  |
2026 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Term loan, maximum principal amount |  |  |  |  |  |  | $ 350,000,000.0 |  |
Weighted average interest rate | 5.75% |  |  | 5.75% | 5.75% |  |  |  |
Total long-term debt including current maturities | $ 350,000,000 | 350,000,000 |  |  |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Term loan, maximum principal amount |  |  |  |  |  |  |  |  | $ 330,000,000.0
Weighted average interest rate | 4.875% |  |  | 4.875% |  |  |  |  | 4.875%
Total long-term debt including current maturities | $ 330,000,000 | 330,000,000 |  |  |  |  |  |  |
Term Loan | Revolving credit agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Term loan, maximum principal amount |  |  |  |  |  | $ 180,000,000.0 |  | $ 150,000,000.0 |
Weighted average interest rate | 3.148% |  |  | 3.148% |  |  |  |  |
Loss on debt extinguishment | $ (1,800,000) |  |  |  |  |  |  |  |
Total long-term debt including current maturities | 0 | 210,125,000 |  |  |  |  |  |  |
Poland Term Loan | CMCP |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Term loan, maximum principal amount | 67,900,000 |  |  | zł 250,000,000.0 |  |  |  |  |
Total long-term debt including current maturities | $ 40,700,000 |  |  | zł 150,000,000.0 |  |  |  |  |
Poland Term Loan | Revolving credit agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted average interest rate | 1.73% |  |  | 1.73% |  |  |  |  |
Total long-term debt including current maturities | $ 40,713,000 | 0 |  |  |  |  |  |  |
U.S. Program |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Transfer of Accounts Receivable Program, Face Amount | 200,000,000.0 |  |  |  |  |  |  |  |
Transfers of Accounts Receivable Outstanding | 0 | 0 |  |  |  |  |  |  |
Poland Program |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Transfer of Accounts Receivable Program, Face Amount | 59,700,000 | 55,200,000 |  | zł 220,000,000.0 |  |  |  |  |
Transfers of Accounts Receivable Outstanding | $ 0 | $ 3,900,000 |  |  |  |  |  |  |
Advance Limit as Percent of Eligible Trade Accounts Receivable Transferred | 90.00% |  |  | 90.00% |  |  |  |  |
Poland Program | Short-term borrowings |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Weighted average interest rate | 0.98% |  |  | 0.98% |  |  |  |  |
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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