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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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