v3.26.1
SEGMENT INFORMATION (External Net Sales from Continuing Operations by Major Product) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2026
May 31, 2025
May 31, 2026
May 31, 2025
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales $ 2,483,245 $ 2,019,984 $ 6,735,570 $ 5,683,962
Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 2,475,190 2,007,330 6,704,935 5,648,530
Intersegment Eliminations        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 33,223 35,611 95,581 94,503
North America Steel Group        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 1,809,919 1,579,603 5,121,243 4,517,698
North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 1,789,381 1,562,286 5,058,760 4,467,771
North America Steel Group | Intersegment Eliminations        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 20,538 17,317 62,483 49,927
Europe Steel Group        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 292,114 248,320 741,435 656,992
Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 291,235 247,590 738,899 655,026
Europe Steel Group | Intersegment Eliminations        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 879 730 2,536 1,966
Construction Solutions Group        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 406,380 215,018 937,838 568,343
Construction Solutions Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 394,574 197,454 907,276 525,733
Construction Solutions Group | Intersegment Eliminations        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 11,806 17,564 30,562 42,610
Corporate and Other        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales (25,168) (22,957) (64,946) (59,071)
Corporate and Other | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 8,055 12,654 30,635 35,432
Segment Eliminations | Intersegment Eliminations        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales (33,223) (35,611) (95,581) (94,503)
Raw materials | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 460,816 337,624 1,193,727 976,010
Raw materials | North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 453,206 331,123 1,174,806 959,083
Raw materials | Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 7,610 6,501 18,921 16,927
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 951,024 864,526 2,706,351 2,404,021
Steel products | North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 715,837 666,298 2,112,559 1,884,312
Steel products | Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 235,187 198,228 593,792 519,709
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 646,326 586,280 1,811,261 1,674,806
Downstream products | North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 564,242 506,639 1,601,255 1,462,696
Downstream products | Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 36,781 33,639 92,005 92,551
Downstream products | Construction Solutions Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 45,303 46,002 118,001 119,559
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 81,406 78,219 245,744 219,931
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 81,406 78,219 245,744 219,931
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 85,779 68,560 208,252 173,266
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 85,779 68,560 208,252 173,266
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 85,028 84,775 255,765 235,928
Other | North America Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 56,096 58,226 170,140 161,680
Other | Europe Steel Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 11,657 9,222 34,181 25,839
Other | Construction Solutions Group | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales 9,220 4,673 20,809 12,977
Other | Corporate and Other | Segments        
Entity-Wide Information, Revenue from External Customer [Line Items]        
Net sales $ 8,055 $ 12,654 $ 30,635 $ 35,432