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CREDIT ARRANGEMENTS (Long-term Debt) (Details) - USD ($) $ in Thousands	Aug. 31, 2018	Aug. 31, 2017
Debt Instrument [Line Items]
Total long-term debt including current maturities	$ 1,170,129	$ 832,077
Less debt issuance costs	11,764	7,315
Total long-term debt outstanding	1,158,365	824,762
Current maturities of long-term debt	19,746	19,182
Long-term debt	$ 1,138,619	805,580
2027 Notes
Debt Instrument [Line Items]
Weighted average interest rate	5.375%
Total long-term debt including current maturities	$ 300,000	300,000
2026 Notes
Debt Instrument [Line Items]
Weighted average interest rate	5.75%
Total long-term debt including current maturities	$ 350,000	0
2023 Notes
Debt Instrument [Line Items]
Weighted average interest rate	4.875%
Total long-term debt including current maturities	$ 330,000	330,000
Other, including equipment notes
Debt Instrument [Line Items]
Total long-term debt including current maturities	$ 47,629	52,077
Revolving credit agreement | 2022 Term Loan
Debt Instrument [Line Items]
Weighted average interest rate	3.281%
Total long-term debt including current maturities	$ 142,500	$ 150,000

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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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