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CREDIT ARRANGEMENTS (Long-term Debt, Including the Deferred Gain from the Termination of the Interest Rate Swaps) (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May. 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 | $ 1,289,122,000 | $ 1,289,047,000 |  |  |
Current maturities of long-term debt | 9,753,000 | 8,005,000 |  |  |
Long-term debt | 1,279,369,000 | 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 | $ 406,317,000 | $ 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 | $ 514,837,000 | $ 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 | $ 330,000,000 |  |
Debt instrument, interest rate, stated percentage | 4.875% | 4.875% | 4.875% |  |
Debt instrument, maturity date | May 15, 2023 | 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 | $ 37,968,000 | $ 32,196,000 |  |  |

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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