v3.26.3
SEGMENT INFORMATION (External Net Sales from Continuing Operations by Major Product) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2026
Aug. 31, 2025
Aug. 31, 2024
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales $ 9,393,904 $ 7,798,480 $ 7,925,972
Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 9,356,936 7,749,655 7,875,693
Eliminations      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 126,591 128,388 109,777
North America Steel Group      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 7,083,137 6,150,802 6,383,106
North America Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 6,998,164 6,083,849 6,309,730
North America Steel Group | Eliminations      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 84,973 66,953 73,376
Construction Solutions Group      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 1,376,617 806,082 750,754
Construction Solutions Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 1,338,651 747,486 717,397
Construction Solutions Group | Eliminations      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 37,966 58,596 33,357
Europe Steel Group      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 1,023,773 921,159 851,610
Europe Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 1,020,121 918,320 848,566
Europe Steel Group | Eliminations      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 3,652 2,839 3,044
Corporate and Other      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales (89,623) (79,563) (59,498)
Corporate and Other | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 36,968 48,825 50,279
Raw materials | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 1,685,998 1,328,612 1,329,938
Raw materials | North America Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 1,658,409 1,305,753 1,311,995
Raw materials | Construction Solutions Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0 0 0
Raw materials | Europe Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 27,589 22,859 17,943
Raw materials | Corporate and Other | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0 0 0
Steel products | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 3,733,217 3,291,479 3,237,358
Steel products | North America Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 2,917,875 2,564,107 2,564,472
Steel products | Construction Solutions Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0 0 0
Steel products | Europe Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 815,342 727,372 672,886
Steel products | Corporate and Other | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0 0 0
Downstream products | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 2,479,997 2,287,011 2,496,696
Downstream products | North America Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 2,188,632 1,993,761 2,217,621
Downstream products | Construction Solutions Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 161,450 163,409 157,644
Downstream products | Europe Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 129,915 129,841 121,431
Downstream products | Corporate and Other | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0 0 0
Precast products | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 501,639    
Precast products | North America Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0    
Precast products | Construction Solutions Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 501,639    
Precast products | Europe Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0    
Precast products | Corporate and Other | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0    
Construction products | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 337,425 304,130 290,304
Construction products | North America Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0 0 0
Construction products | Construction Solutions Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 337,425 304,130 290,304
Construction products | Europe Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0 0 0
Construction products | Corporate and Other | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0 0 0
Ground stabilization solutions | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 305,820 261,738 250,941
Ground stabilization solutions | North America Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0 0 0
Ground stabilization solutions | Construction Solutions Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 305,820 261,738 250,941
Ground stabilization solutions | Europe Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0 0 0
Ground stabilization solutions | Corporate and Other | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 0 0 0
Other | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 349,808 325,510 320,735
Other | North America Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 233,248 220,228 215,642
Other | Construction Solutions Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 32,317 18,209 18,508
Other | Europe Steel Group | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales 47,275 38,248 36,306
Other | Corporate and Other | Segments      
Entity-Wide Information, Revenue from External Customer [Line Items]      
Net sales $ 36,968 $ 48,825 $ 50,279