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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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Periodic Payments, as Percent of Original Principal Amount

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Face (par) amount of debt instrument at time of issuance.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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