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CREDIT ARRANGEMENTS (Narrative) (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 26, 2014 USD ($) | May. 31, 2013 USD ($) | Aug. 31, 2008 USD ($) | Jul. 31, 2007 USD ($) | Aug. 31, 2015 USD ($) | Aug. 31, 2014 USD ($) | Aug. 31, 2013 USD ($) | Aug. 31, 2012 USD ($) | Jun. 25, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on debt extinguishment |  |  |  |  | $ 0 | $ 0 | $ 4,758,000 |  |
Net proceeds from termination of interest rate swaps |  |  |  |  |  |  |  | $ 52,700,000 |
Deferred gain of interest rate swaps |  |  |  |  | 19,200,000 | 26,800,000 |  |  |
Amortization of interest rate swaps termination gain |  |  |  |  | 7,597,000 | 7,597,000 | 12,470,000 |  |
Interest costs capitalized |  |  |  |  |  |  | 1,000,000 |  |
Interest paid |  |  |  |  | 86,700,000 | 85,600,000 | $ 82,500,000 |  |
CMCP |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity |  |  |  |  | 56,900,000 |  |  |  |
Annual total borrowing |  |  |  |  | 49,600,000 | 111,700,000 |  |  |
Annual total payments |  |  |  |  | 49,600,000 | 111,700,000 |  |  |
Revolving credit agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, issuance date | Jun. 26, 2014 |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity | $ 350,000,000 |  |  |  |  |  |  |  |
Revolving credit facility, maturity date | Jun. 26, 2019 |  |  |  |  |  |  |  |
Revolving credit facility expired borrowing capacity |  |  |  |  |  |  |  |  | $ 300,000,000
Revolving credit facility, maximum borrowing capacity |  |  |  |  | $ 500,000,000 |  |  |  |
Minimum interest coverage ratio |  |  |  |  | 2.5 |  |  |  |
Maximum debt to capitalization ratio |  |  |  |  | 0.60 |  |  |  |
Minimum liquidity required |  |  |  |  | $ 150,000,000 |  |  |  |
Actual interest coverage ratio |  |  |  |  | 5.76 |  |  |  |
Actual debt to capitalization ratio |  |  |  |  | 0.49 |  |  |  |
Stand-by letters of credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity |  |  |  |  | $ 50,000,000 |  |  |  |
Stand by letters of credit outstanding amount |  |  |  |  | 23,400,000 | 28,100,000 |  |  |
$330 million notes at 4.875% due May 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, issuance date |  | May 20, 2013 |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 330,000,000 |  |  | $ 330,000,000 |  |  |  |
Debt instrument, interest rate, stated percentage |  | 4.875% |  |  | 4.875% |  |  |  |
Proceeds from debt, net of underwriting discounts and issuance costs |  | $ 325,000,000 |  |  |  |  |  |  |
$200 million notes at 5.625% due November 2013 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 200,000,000 |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 5.625% |  |  |  |  |  |  |
Proceeds of 2023 Notes used to repay debt |  | $ 205,300,000 |  |  |  |  |  |  |
$500 million notes at 7.35% due August 2018 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, issuance date |  |  | Aug. 04, 2008 |  |  |  |  |  |
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 |  |  | Aug. 15, 2018 |  |  |  |  |  |
Effective interest rate |  |  | 6.40% |  |  |  |  |  |
$400 million notes at 6.50% due July 2017 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, issuance date |  |  |  | Jul. 17, 2007 |  |  |  |  |
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 |  |  |  | Jul. 15, 2017 |  |  |  |  |
Effective interest rate |  |  |  | 5.74% |  |  |  |  |

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