CREDIT ARRANGEMENTS (Narrative) (Details)	3 Months Ended
	Nov. 30, 2018 PLN (zł)	Nov. 30, 2018 USD ($)	Aug. 31, 2018 USD ($)	Jul. 31, 2017 USD ($)	May 31, 2013 USD ($)
CMCP
Debt Instrument [Line Items]
Revolving credit facility current borrowing capacity	zł 225,000,000	$ 59,337,007.832485
Revolving credit facility, amount drawn		59,300,000
Stand by letters of credit outstanding amount		1,300,000	1,100,000
Revolving credit facility
Debt Instrument [Line Items]
Revolving credit facility current borrowing capacity		350,000,000
Revolving credit facility, maximum borrowing capacity		$ 600,000,000
Revolving credit facility, amount drawn
Minimum interest coverage ratio	2.50
Maximum debt to capitalization ratio	0.60
Actual interest coverage ratio	6.55	6.55
Actual debt to capitalization ratio	0.48	0.48
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		3,300,000	3,300,000
U.S. Program
Debt Instrument [Line Items]
Transfer of accounts receivable program limit		200,000,000.0
Advances outstanding under transfer of receivables programs		0
U.S. Program with Consent of CMCRV and Program Administrative Agent
Debt Instrument [Line Items]
Transfer of accounts receivable program limit		300,000,000.0
Poland Program
Debt Instrument [Line Items]
Transfer of accounts receivable program limit	zł 220,000,000	$ 58,018,407.6584298
Advance limit as percent of eligible trade accounts receivable transferred (percent)	90.00%	90.00%
Advances outstanding under transfer of receivables programs		$ 0	$ 12,147,000
2027 Notes
Debt Instrument [Line Items]
Debt instrument, face amount				$ 300,000,000
Weighted average interest rate	5.375%	5.375%		5.375%
2026 Notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 350,000,000
Weighted average interest rate	5.75%	5.75%
2023 Notes
Debt Instrument [Line Items]
Debt instrument, face amount					$ 330,000,000
Weighted average interest rate	4.875%	4.875%			4.875%
Term Loans | Revolving credit facility
Debt Instrument [Line Items]
Weighted average interest rate	3.81%	3.81%
Periodic payments, as percent of original principal amount (percent)	1.25%
Term Loans | 2022 Term Loan | Revolving credit facility
Debt Instrument [Line Items]
Debt instrument, face amount		$ 150,000,000
Term Loans | 2018 Term Loan | Revolving credit facility
Debt Instrument [Line Items]
Debt instrument, face amount		$ 180,000,000.0