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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Disaggregation of Revenue [Line Items]    
Net sales $ 1,277,342 $ 1,076,533
Steel Products    
Disaggregation of Revenue [Line Items]    
Net sales 940,781 701,362
Ferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 121,071 132,016
Nonferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 134,196 158,616
Construction Materials    
Disaggregation of Revenue [Line Items]    
Net sales 57,171 59,031
Other    
Disaggregation of Revenue [Line Items]    
Net sales 24,123 25,508
Americas Recycling    
Disaggregation of Revenue [Line Items]    
Net sales 240,181 274,337
Americas Recycling | Steel Products    
Disaggregation of Revenue [Line Items]    
Net sales 239 298
Americas Recycling | Ferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 111,654 122,647
Americas Recycling | Nonferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 128,075 150,952
Americas Recycling | Construction Materials    
Disaggregation of Revenue [Line Items]    
Net sales 0 0
Americas Recycling | Other    
Disaggregation of Revenue [Line Items]    
Net sales 213 440
Americas Mills    
Disaggregation of Revenue [Line Items]    
Net sales 373,671 246,733
Americas Mills | Steel Products    
Disaggregation of Revenue [Line Items]    
Net sales 347,965 221,562
Americas Mills | Ferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 9,142 9,048
Americas Mills | Nonferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 3,180 3,981
Americas Mills | Construction Materials    
Disaggregation of Revenue [Line Items]    
Net sales 0 0
Americas Mills | Other    
Disaggregation of Revenue [Line Items]    
Net sales 13,384 12,142
Americas Fabrication    
Disaggregation of Revenue [Line Items]    
Net sales 434,558 330,552
Americas Fabrication | Steel Products    
Disaggregation of Revenue [Line Items]    
Net sales 374,807 269,642
Americas Fabrication | Ferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 0 0
Americas Fabrication | Nonferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 0 0
Americas Fabrication | Construction Materials    
Disaggregation of Revenue [Line Items]    
Net sales 57,171 59,031
Americas Fabrication | Other    
Disaggregation of Revenue [Line Items]    
Net sales 2,580 1,879
International Mill    
Disaggregation of Revenue [Line Items]    
Net sales 226,673 220,212
International Mill | Steel Products    
Disaggregation of Revenue [Line Items]    
Net sales 217,770 209,860
International Mill | Ferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 275 321
International Mill | Nonferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 2,941 3,683
International Mill | Construction Materials    
Disaggregation of Revenue [Line Items]    
Net sales 0 0
International Mill | Other    
Disaggregation of Revenue [Line Items]    
Net sales 5,687 6,348
Corporate    
Disaggregation of Revenue [Line Items]    
Net sales 2,259 4,699
Corporate | Steel Products    
Disaggregation of Revenue [Line Items]    
Net sales 0 0
Corporate | Ferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 0 0
Corporate | Nonferrous Scrap    
Disaggregation of Revenue [Line Items]    
Net sales 0 0
Corporate | Construction Materials    
Disaggregation of Revenue [Line Items]    
Net sales 0 0
Corporate | Other    
Disaggregation of Revenue [Line Items]    
Net sales $ 2,259 $ 4,699