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CREDIT ARRANGEMENTS (Long-term Debt, Including the Deferred Gain from the Termination of the Interest Rate Swaps) (Details) - USD ($)	Nov. 30, 2017	Aug. 31, 2017	Jul. 31, 2017	May 31, 2013
Debt Instrument [Line Items]
Total debt	$ 832,133,000	$ 832,077,000
Less: Debt issuance costs	7,102,000	7,315,000
Total amounts outstanding	825,031,000	824,762,000
Less: Current maturities of long-term debt	21,246,000	19,182,000
Long-term debt	$ 803,785,000	805,580,000
2027 Notes
Debt Instrument [Line Items]
Weighted average interest rate	5.375%		5.375%
Debt instrument, face amount	$ 300,000,000	300,000,000	$ 300,000,000
2023 Notes
Debt Instrument [Line Items]
Weighted average interest rate	4.875%
Debt instrument, face amount				$ 330,000,000
Total debt	$ 330,000,000	330,000,000
Other, including equipment notes
Debt Instrument [Line Items]
Total debt	52,133,000	52,077,000
Revolving credit facility
Debt Instrument [Line Items]
Maximum principal amount	$ 750,000,000
Revolving credit facility | Term Loan (Due 2022)
Debt Instrument [Line Items]
Weighted average interest rate	2.83%
Maximum principal amount	$ 150,000,000	$ 150,000,000

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Long-term Debt and Capital Lease Obligations, Net

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

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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 long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Weighted average interest rate of long-term debt outstanding.

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