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CREDIT ARRANGEMENTS (Narrative) (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 26, 2014 USD ($) | May. 31, 2015 USD ($) | May. 31, 2014 USD ($) | May. 31, 2015 USD ($) | May. 31, 2014 USD ($) | Aug. 31, 2014 USD ($) | Aug. 31, 2012 USD ($) | May. 31, 2013 USD ($) | Aug. 31, 2008 USD ($) | Jul. 31, 2007 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Net proceeds from termination of interest rate swaps |  |  |  |  |  |  | $ 52,700,000 |  |  |
Unamortized deferred gain on termination of interest rate swaps |  | $ 21,100,000 |  | $ 21,100,000 |  | $ 26,800,000 |  |  |  |
Amortization of interest rate swaps termination gain |  | 1,900,000 | $ 1,900,000 | 5,698,000 | $ 5,698,000 |  |  |  |  |
Interest paid |  | 10,600,000 | $ 9,600,000 | 53,500,000 | $ 51,900,000 |  |  |  |  |
CMCP |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity |  | 57,500,000.0 |  | 57,500,000.0 |  |  |  |  |  |
Total borrowing |  |  |  | 49,600,000 |  |  |  |  |  |
Total payments |  |  |  | 49,600,000 |  |  |  |  |  |
$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 |  | $ 330,000,000 |  |
Debt instrument, interest rate, stated percentage |  | 4.875% |  | 4.875% |  | 4.875% |  | 4.875% |  |
Debt instrument, maturity date |  |  |  | May 15, 2023 |  | May 15, 2023 |  |  |  |
Redemption purchase price to principal amount, percentage |  |  |  |  |  |  |  | 100.00% |  |
Change of control triggering event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption purchase price to principal amount, percentage |  |  |  |  |  |  |  | 101.00% |  |
$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 |  |  | $ 500,000,000 |
Debt instrument, interest rate, stated percentage |  | 7.35% |  | 7.35% |  | 7.35% |  |  | 7.35% |
Debt instrument, maturity date |  |  |  | August 2018 |  | August 2018 |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  | 6.40% |
$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 |  |  |  | $ 400,000,000
Debt instrument, interest rate, stated percentage |  | 6.50% |  | 6.50% |  | 6.50% |  |  |  | 6.50%
Debt instrument, maturity date |  |  |  | July 2017 |  | July 2017 |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  |  | 5.74%
Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity | $ 350,000,000 |  |  |  |  |  |  |  |  |
Revolving credit facility, maturity date |  |  |  | Jun. 26, 2019 |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ 500,000,000 |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio | 2.50 |  |  |  |  |  |  |  |  |
Maximum debt to capitalization ratio | 0.60 |  |  |  |  |  |  |  |  |
Minimum liquidity required | $ 150,000,000 |  |  |  |  |  |  |  |  |
Actual interest coverage ratio |  | 6.26 |  | 6.26 |  |  |  |  |  |
Actual debt to capitalization ratio |  | 0.48 |  | 0.48 |  |  |  |  |  |
Revolving credit facility, amount drawn |  | $ 0 |  | $ 0 |  | $ 0 |  |  |  |
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 |  | $ 23,400,000 |  | $ 28,100,000 |  |  |  |

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