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CREDIT ARRANGEMENTS (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 29, 2016 USD ($) | May 31, 2017 USD ($) | May 31, 2016 USD ($) | May 31, 2017 USD ($) | May 31, 2016 USD ($) | Aug. 31, 2012 USD ($) | May 31, 2017 PLN | May 31, 2017 USD ($) | Aug. 31, 2016 USD ($) | Aug. 31, 2014 USD ($) | May 31, 2013 USD ($) | May 31, 2011 | May 31, 2010 | Aug. 31, 2008 USD ($) | Jul. 31, 2007 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ 0 | $ (115,000) | $ 0 | $ (11,480,000) |  |  |  |  |  |  |  |  |  |
Net proceeds from termination of interest rate swaps |  |  |  |  |  | $ 52,700,000 |  |  |  |  |  |  |  |  |
Unamortized deferred gain on termination of interest rate swaps |  |  |  |  |  |  |  | $ 5,900,000 | $ 11,600,000 |  |  |  |  |  |
Amortization of interest rate swaps termination gain |  | (1,900,000) | (1,900,000) | (5,698,000) | (5,698,000) |  |  |  |  |  |  |  |  |  |
Interest capitalized |  | 2,900,000 | 600,000 | 6,600,000 | 1,600,000 |  |  |  |  |  |  |  |  |  |
Interest paid |  | $ 8,300,000 | 9,100,000 | 41,400,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |
CMCP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility current borrowing capacity |  |  |  |  |  |  | PLN 175,000,000 | 47,000,000.0 |  |  |  |  |  |  |
Stand by letters of credit outstanding amount |  |  |  |  |  |  |  | 1,500,000 | 1,500,000 |  |  |  |  |  |
Total borrowing |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Total payments |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
2018 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | 6,100,000 |  | 6,000,000 |  |  |  |  |  |  |  |  |  |
2017 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 5,400,000 |  | $ 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 |  |  |  |  |
Revolving credit facility, amount drawn |  |  |  |  |  |  |  | 0 | $ 0 |  |  |  |  |  |
Minimum interest coverage ratio |  |  |  | 2.50 |  |  |  |  |  |  |  |  |  |  |
Maximum debt to capitalization ratio |  |  |  | 0.60 |  |  |  |  |  |  |  |  |  |  |
Minimum liquidity required |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |
Actual interest coverage ratio |  |  |  |  |  |  | 5.98 | 5.98 |  |  |  |  |  |  |
Actual debt to capitalization ratio |  |  |  |  |  |  | 0.43 | 0.43 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |

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