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ACCOUNTING POLICIES - Changes to Earnings (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Earnings from continuing operations	$ 10,849	$ 13,465	$ 36,482	$ 47,730
Net earnings attributable to CMC		$ 6,197	$ 35,565	$ 38,381
Basic earnings (loss) per share attributable to CMC:
Earnings from continuing operations (in USD per share)	$ 0.09	$ 0.12	$ 0.32	$ 0.41
Net earnings (in USD per share)	0.09	0.06	0.31	0.33
Diluted earnings (loss) per share attributable to CMC:
Earnings from continuing operations (in USD per share)	0.09	0.11	0.31	0.40
Net earnings (in USD per share)	$ 0.09	$ 0.05	$ 0.30	$ 0.32
As Computed Under LIFO
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Earnings from continuing operations	$ 27,625	$ 61,719	$ 65,721	$ 100,053
Net earnings attributable to CMC		$ 54,451		$ 90,704
Basic earnings (loss) per share attributable to CMC:
Earnings from continuing operations (in USD per share)	$ 0.24	$ 0.53	$ 0.57	$ 0.85
Net earnings (in USD per share)	0.24	0.47	0.56	0.77
Diluted earnings (loss) per share attributable to CMC:
Earnings from continuing operations (in USD per share)	0.23	0.52	0.56	0.85
Net earnings (in USD per share)	$ 0.23	$ 0.46	$ 0.55	$ 0.77
Effect of Change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Earnings from continuing operations	$ (16,776)	$ (48,254)	$ (29,239)	$ (52,323)
Net earnings attributable to CMC		$ (48,254)		$ (52,323)
Basic earnings (loss) per share attributable to CMC:
Earnings from continuing operations (in USD per share)	$ (0.15)	$ (0.41)	$ (0.25)	$ (0.44)
Net earnings (in USD per share)	(0.15)	(0.41)	(0.25)	(0.44)
Diluted earnings (loss) per share attributable to CMC:
Earnings from continuing operations (in USD per share)	(0.14)	(0.41)	(0.25)	(0.45)
Net earnings (in USD per share)	$ (0.14)	$ (0.41)	$ (0.25)	$ (0.45)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings attributable to CMC	$ 10,502
Retained Earnings | As Computed Under LIFO
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings attributable to CMC	27,278		$ 64,804
Retained Earnings | Effect of Change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings attributable to CMC	$ (16,776)		$ (29,239)

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