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CREDIT ARRANGEMENTS (Narrative) (Details) zł in Millions | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2018 USD ($) | Aug. 31, 2018 USD ($) | Aug. 31, 2017 USD ($) | Aug. 31, 2016 USD ($) | Aug. 31, 2018 PLN (zł) | Aug. 31, 2018 USD ($) | Feb. 21, 2018 USD ($) | Aug. 31, 2017 PLN (zł) | Aug. 31, 2017 USD ($) | Jun. 26, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 1,170,129,000 |  |  | $ 832,077,000 |
Interest costs capitalized |  | $ 7,300,000 | $ 9,800,000 | $ 3,600,000 |  |  |  |  |  |
CMCP |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | zł 225.0 | 60,800,000 |  | zł 175.0 | 49,100,000 |
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
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  | $ 600,000,000 |  |  |  |
Minimum interest coverage ratio |  | 2.5 |  |  |  |  |  |  |  |
Maximum debt to capitalization ratio |  | 0.6 |  |  |  |  |  |  |  |
Actual interest coverage ratio |  |  |  |  | 8.70 | 8.70 |  |  |  |
Actual debt to capitalization ratio |  |  |  |  | 0.44 | 0.44 |  |  |  |
Stand-by letters of credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 50,000,000 |  |  |  |
Stand by letters of credit outstanding amount |  |  |  |  |  | 3,300,000 |  |  | 3,000,000 |
2027 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 300,000,000 |  |  | 300,000,000 |
Weighted average interest rate |  |  |  |  | 5.375% | 5.375% |  |  |  |
2026 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 350,000,000 |  |  | 0 |
Weighted average interest rate |  |  |  |  | 5.75% | 5.75% |  |  |  |
Debt issuance costs | $ 5,300,000 |  |  |  |  |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 330,000,000 |  |  | 330,000,000 |
Weighted average interest rate |  |  |  |  | 4.875% | 4.875% |  |  |  |
2022 Term Loan | Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 142,500,000 |  |  | $ 150,000,000 |
Weighted average interest rate |  |  |  |  | 3.281% | 3.281% |  |  |  |
Term loan, maximum principal amount |  |  |  |  |  | $ 150,000,000.0 |  |  |  |
Quarterly payments, as percent of original principal amount (percent) |  | 1.25% |  |  |  |  |  |  |  |
Term Loan A Facility | Revolving credit agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Quarterly payments, as percent of original principal amount (percent) | 1.25% |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 200,000,000 |  |  |

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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