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CREDIT ARRANGEMENTS (Narrative) (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 26, 2014 USD ($) | Feb. 29, 2016 USD ($) | May 31, 2016 USD ($) | May 31, 2015 USD ($) | May 31, 2016 USD ($) | May 31, 2015 USD ($) | Aug. 31, 2012 USD ($) | May 31, 2016 PLN | May 31, 2016 USD ($) | Aug. 31, 2015 PLN | Aug. 31, 2015 USD ($) | May 31, 2013 USD ($) | May 31, 2011 | May 31, 2010 | Aug. 31, 2008 USD ($) | Jul. 31, 2007 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment |  |  | $ 115,000 | $ 0 | $ 11,480,000 | $ 0 |  |  |  |  |  |  |  |  |  |
Net proceeds from termination of interest rate swaps |  |  |  |  |  |  | $ 52,700,000 |  |  |  |  |  |  |  |  |
Unamortized deferred gain on termination of interest rate swaps |  |  |  |  |  |  |  |  | $ 13,600,000 |  | $ 19,200,000 |  |  |  |  |
Amortization of interest rate swaps termination gain |  |  | 1,900,000 | 1,900,000 | 5,698,000 | 5,698,000 |  |  |  |  |  |  |  |  |  |
Interest paid |  |  | $ 9,100,000 | $ 10,600,000 | 50,000,000 | 53,500,000 |  |  |  |  |  |  |  |  |  |
CMCP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity |  |  |  |  |  |  |  | PLN 175,000,000 | $ 44,400,000.0 | PLN 215,000,000 | 56,900,000.0 |  |  |  |  |
Total borrowing |  |  |  |  | 0 | 49,600,000 |  |  |  |  |  |  |  |  |  |
Total payments |  |  |  |  | $ 0 | $ 49,600,000 |  |  |  |  |  |  |  |  |  |
$330 million notes at 4.875% due May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 330,000,000 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  |  | 4.875% |  |  |  |
Debt instrument, maturity date |  |  |  |  | May 15, 2023 |  |  |  |  |  |  |  |  |  |  |
$500 million notes at 6.40% due August 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.35% |
Debt instrument, maturity date |  |  |  |  | August 2018 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.40% |  |
Debt repurchased as a result of cash tender offer |  | $ 100,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment |  |  |  |  | $ (6,100,000) |  |  |  |  |  |  |  |  |  |  |
$400 million notes at 5.74% due July 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50%
Debt instrument, maturity date |  |  |  |  | July 2017 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 5.74% |  |  |
Debt repurchased as a result of cash tender offer |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment |  |  |  |  | $ (5,400,000) |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 4.70 | 4.70 |  |  |  |  |  |  |
Actual debt to capitalization ratio |  |  |  |  |  |  |  | 0.44 | 0.44 |  |  |  |  |  |  |
Revolving credit facility, amount drawn |  |  |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  | $ 1,700,000 |  | $ 23,400,000 |  |  |  |  |

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