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CHANGES IN BUSINESS (Financial Information for Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2017	Nov. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 124	$ 80,948
Earnings (loss) before income taxes	(1,898)	1,873
CMC Cometals
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	124	80,972
Cost of goods sold	29	72,794
Selling, general and administrative expenses	1,281	5,382
Interest expense	0	6
Earnings (loss) before income taxes	(1,186)	2,790
Income taxes (benefit)	(172)	553
Earnings (loss) from discontinued operations	$ (1,014)	$ 2,237

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