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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 1,402,783	$ 1,054,268	$ 2,680,125	$ 2,130,801
Steel Products
Disaggregation of Revenue [Line Items]
Net sales	1,075,026	699,646	2,015,807	1,401,008
Ferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	114,252	123,706	235,323	255,722
Nonferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	125,836	155,785	260,032	314,401
Construction Materials
Disaggregation of Revenue [Line Items]
Net sales	60,190	51,174	117,361	110,205
Other
Disaggregation of Revenue [Line Items]
Net sales	27,479	23,957	51,602	49,465
Americas Recycling
Disaggregation of Revenue [Line Items]
Net sales	225,888	265,432	466,069	539,769
Americas Recycling | Steel Products
Disaggregation of Revenue [Line Items]
Net sales	202	277	441	575
Americas Recycling | Ferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	105,253	116,313	216,907	238,960
Americas Recycling | Nonferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	120,004	148,425	248,079	299,377
Americas Recycling | Construction Materials
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Americas Recycling | Other
Disaggregation of Revenue [Line Items]
Net sales	429	417	642	857
Americas Mills
Disaggregation of Revenue [Line Items]
Net sales	472,795	262,703	846,466	509,436
Americas Mills | Steel Products
Disaggregation of Revenue [Line Items]
Net sales	444,327	240,024	792,292	461,586
Americas Mills | Ferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	8,744	7,095	17,886	16,143
Americas Mills | Nonferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	3,308	3,902	6,488	7,883
Americas Mills | Construction Materials
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Americas Mills | Other
Disaggregation of Revenue [Line Items]
Net sales	16,416	11,682	29,800	23,824
Americas Fabrication
Disaggregation of Revenue [Line Items]
Net sales	526,678	310,199	961,236	640,751
Americas Fabrication | Steel Products
Disaggregation of Revenue [Line Items]
Net sales	462,963	257,167	837,770	526,809
Americas Fabrication | Ferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Americas Fabrication | Nonferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Americas Fabrication | Construction Materials
Disaggregation of Revenue [Line Items]
Net sales	60,190	51,174	117,361	110,205
Americas Fabrication | Other
Disaggregation of Revenue [Line Items]
Net sales	3,525	1,858	6,105	3,737
International Mill
Disaggregation of Revenue [Line Items]
Net sales	174,945	211,484	401,618	431,696
International Mill | Steel Products
Disaggregation of Revenue [Line Items]
Net sales	167,534	202,178	385,304	412,038
International Mill | Ferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	255	298	530	619
International Mill | Nonferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	2,524	3,458	5,465	7,141
International Mill | Construction Materials
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
International Mill | Other
Disaggregation of Revenue [Line Items]
Net sales	4,632	5,550	10,319	11,898
Corporate
Disaggregation of Revenue [Line Items]
Net sales	2,477	4,450	4,736	9,149
Corporate | Steel Products
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Corporate | Ferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Corporate | Nonferrous Scrap
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Corporate | Construction Materials
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Corporate | Other
Disaggregation of Revenue [Line Items]
Net sales	$ 2,477	$ 4,450	$ 4,736	$ 9,149

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