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CREDIT ARRANGEMENTS (Long-term Debt) (Details) - USD ($)	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	May. 31, 2013	Aug. 31, 2008	Jul. 31, 2007
Debt Instrument [Line Items]
Total long-term debt including current maturities	$ 1,287,992,000	$ 1,289,047,000
Current maturities of long-term debt	10,110,000	8,005,000
Long-term debt	1,277,882,000	1,281,042,000
$400 million notes at 6.50% due July 2017
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,000,000	$ 400,000,000			$ 400,000,000
Debt instrument, interest rate, stated percentage	6.50%	6.50%			6.50%
Debt instrument, maturity date	July 2017	July 2017
Weighted average interest rate	5.74%
Total long-term debt including current maturities	$ 405,573,000	$ 408,546,000
$500 million notes at 7.35% due August 2018
Debt Instrument [Line Items]
Debt instrument, face amount	$ 500,000,000	$ 500,000,000		$ 500,000,000
Debt instrument, interest rate, stated percentage	7.35%	7.35%		7.35%
Debt instrument, maturity date	August 2018	August 2018
Weighted average interest rate	6.40%
Total long-term debt including current maturities	$ 513,680,000	$ 518,305,000
$330 million notes at 4.875% due May 2023
Debt Instrument [Line Items]
Debt instrument, face amount	$ 330,000,000		$ 330,000,000
Debt instrument, interest rate, stated percentage	4.875%		4.875%
Debt instrument, maturity date	May 15, 2023
Weighted average interest rate	4.875%
Total long-term debt including current maturities	$ 330,000,000	330,000,000
Other, including equipment notes
Debt Instrument [Line Items]
Total long-term debt including current maturities	$ 38,739,000	$ 32,196,000

X

- Definition

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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