v3.26.1
SEGMENT INFORMATION (External Net Sales from Continuing Operations by Major Product) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Feb. 28, 2026
Feb. 28, 2025
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales $ 2,132,018 $ 1,754,376 $ 4,252,325 $ 3,663,978
Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 2,122,760 1,743,741 4,229,745 3,641,200
Intersegment Eliminations        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 33,650 30,370 62,358 58,892
North America Steel Group        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 1,632,492 1,403,346 3,311,324 2,938,095
North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 1,608,321 1,386,848 3,269,379 2,905,485
North America Steel Group | Intersegment Eliminations        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 24,171 16,498 41,945 32,610
Europe Steel Group        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 200,818 198,648 449,321 408,672
Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 200,014 198,029 447,664 407,436
Europe Steel Group | Intersegment Eliminations        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 804 619 1,657 1,236
Construction Solutions Group        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 323,100 172,117 531,458 353,325
Construction Solutions Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 314,425 158,864 512,702 328,279
Construction Solutions Group | Intersegment Eliminations        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 8,675 13,253 18,756 25,046
Corporate and Other        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales (24,392) (19,735) (39,778) (36,114)
Corporate and Other | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 9,258 10,635 22,580 22,778
Segment Eliminations | Intersegment Eliminations        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales (33,650) (30,370) (62,358) (58,892)
Raw materials | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 362,813 322,982 732,911 638,386
Raw materials | North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 357,548 317,841 721,600 627,960
Raw materials | Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 5,265 5,141 11,311 10,426
Raw materials | Construction Solutions Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 0 0 0 0
Raw materials | Corporate and Other | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 0 0 0 0
Steel products | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 836,914 751,893 1,755,327 1,539,495
Steel products | North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 670,831 592,549 1,396,722 1,218,014
Steel products | Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 166,083 159,344 358,605 321,481
Steel products | Construction Solutions Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 0 0 0 0
Steel products | Corporate and Other | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 0 0 0 0
Downstream products | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 562,220 494,916 1,164,935 1,088,526
Downstream products | North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 505,260 428,459 1,037,013 956,057
Downstream products | Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 19,507 25,278 55,224 58,912
Downstream products | Construction Solutions Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 37,453 41,179 72,698 73,557
Downstream products | Corporate and Other | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 0 0 0 0
Construction products | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 78,371 65,731 164,338 141,712
Construction products | North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 0 0 0 0
Construction products | Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 0 0 0 0
Construction products | Construction Solutions Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 78,371 65,731 164,338 141,712
Construction products | Corporate and Other | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 0 0 0 0
Ground stabilization solutions | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 49,882 48,194 122,473 104,706
Ground stabilization solutions | North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 0 0 0 0
Ground stabilization solutions | Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 0 0 0 0
Ground stabilization solutions | Construction Solutions Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 49,882 48,194 122,473 104,706
Ground stabilization solutions | Corporate and Other | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 0 0 0 0
Other | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 100,214 70,660 170,737 151,153
Other | North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 74,682 47,999 114,044 103,454
Other | Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 9,159 8,266 22,524 16,617
Other | Construction Solutions Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 7,115 3,760 11,589 8,304
Other | Corporate and Other | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales $ 9,258 $ 10,635 $ 22,580 $ 22,778