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CREDIT ARRANGEMENTS (Narrative) (Details)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 29, 2016 USD ($)	Feb. 28, 2017 USD ($)	Feb. 29, 2016 USD ($)	Feb. 28, 2017 USD ($)	Feb. 29, 2016 USD ($)	Aug. 31, 2012 USD ($)	Feb. 28, 2017 PLN	Feb. 28, 2017 USD ($)	Aug. 31, 2016 PLN	Aug. 31, 2016 USD ($)	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	$ (11,365,000)	$ 0	$ (11,365,000)
Net proceeds from termination of interest rate swaps						$ 52,700,000
Unamortized deferred gain on termination of interest rate swaps								$ 7,800,000		$ 11,600,000
Amortization of interest rate swaps termination gain		(1,900,000)	(1,900,000)	(3,798,000)	(3,798,000)
Interest capitalized		2,100,000	500,000	3,700,000	1,000,000
Interest paid		$ 24,700,000	31,900,000	33,100,000	40,900,000
CMCP
Debt Instrument [Line Items]
Revolving credit facility current borrowing capacity							PLN 175,000,000	43,000,000.0	PLN 175,000,000	44,800,000.0
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			6,000,000		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							5.65	5.65
Actual debt to capitalization ratio							0.44	0.44
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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