v3.26.1
BUSINESS SEGMENTS (Summary of Certain Financial Information from Continuing Operations by Reportable Segment and Major Product) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2026
May 31, 2025
May 31, 2026
May 31, 2025
Aug. 31, 2025
Segment Reporting Information [Line Items]          
Net sales $ 2,483,245 $ 2,019,984 $ 6,735,570 $ 5,683,962  
Cost of goods sold 2,028,109 1,720,063 5,485,391 4,856,614  
Selling, general and administrative expenses 222,314 175,769 651,104 521,187  
Depreciation and amortization 107,422 72,376 282,711 213,397  
Asset impairments   785   1,171  
Adjusted EBITDA reportable segments 385,563 224,441 1,051,645 620,344  
Interest expense 40,205 10,864 105,981 33,353  
Unrealized loss on undesignated commodity hedges (557) (6,048) 5,527 62  
Corporate and Other expenses (49,654) (36,952) (175,912) (458,049)  
Earnings before income taxes 188,839 109,512 481,514 (85,688)  
Assets 9,796,355 6,993,823 9,796,355 6,993,823 $ 7,171,834
Capital expenditures 156,141 89,450 404,273 293,904  
Reportable Segment, Aggregation before Other Operating Segment          
Segment Reporting Information [Line Items]          
Net sales 2,508,413 2,042,941 6,800,516 5,743,033  
North America Steel Group          
Segment Reporting Information [Line Items]          
Net sales 1,809,919 1,579,603 5,121,243 4,517,698  
Adjusted EBITDA reportable segments 253,487 179,936 817,067 503,069  
Construction Solutions Group          
Segment Reporting Information [Line Items]          
Net sales 406,380 215,018 937,838 568,343  
Adjusted EBITDA reportable segments 97,411 40,912 190,412 87,091  
Europe Steel Group          
Segment Reporting Information [Line Items]          
Net sales 292,114 248,320 741,435 656,992  
Adjusted EBITDA reportable segments 34,665 3,593 44,166 30,184  
Corporate and Other          
Segment Reporting Information [Line Items]          
Net sales (25,168) (22,957) (64,946) (59,071)  
Segments          
Segment Reporting Information [Line Items]          
Net sales 2,475,190 2,007,330 6,704,935 5,648,530  
Segments | Raw materials          
Segment Reporting Information [Line Items]          
Net sales 460,816 337,624 1,193,727 976,010  
Segments | Steel products          
Segment Reporting Information [Line Items]          
Net sales 951,024 864,526 2,706,351 2,404,021  
Segments | Downstream products          
Segment Reporting Information [Line Items]          
Net sales 646,326 586,280 1,811,261 1,674,806  
Segments | Construction products          
Segment Reporting Information [Line Items]          
Net sales 81,406 78,219 245,744 219,931  
Segments | Ground stabilization solutions          
Segment Reporting Information [Line Items]          
Net sales 85,779 68,560 208,252 173,266  
Segments | Other          
Segment Reporting Information [Line Items]          
Net sales 85,028 84,775 255,765 235,928  
Segments | Precast Products          
Segment Reporting Information [Line Items]          
Net sales 172,866   314,470    
Segments | Reportable Segment, Aggregation before Other Operating Segment          
Segment Reporting Information [Line Items]          
Depreciation and amortization 105,083 69,755 275,767 205,853  
Assets 9,071,883 5,875,397 9,071,883 5,875,397  
Capital expenditures 155,735 86,712 399,336 287,065  
Segments | North America Steel Group          
Segment Reporting Information [Line Items]          
Net sales 1,789,381 1,562,286 5,058,760 4,467,771  
Cost of goods sold 1,514,022 1,365,385 4,204,146 3,922,418  
Selling, general and administrative expenses 93,866 77,503 259,363 239,852  
Depreciation and amortization 52,013 49,269 153,806 147,196  
Asset impairments   0   383  
Unrealized loss on undesignated commodity hedges (557) (6,048) 5,527 62  
Assets 4,773,029 4,277,108 4,773,029 4,277,108  
Capital expenditures 123,192 73,689 317,428 234,378  
Segments | North America Steel Group | Raw materials          
Segment Reporting Information [Line Items]          
Net sales 453,206 331,123 1,174,806 959,083  
Segments | North America Steel Group | Steel products          
Segment Reporting Information [Line Items]          
Net sales 715,837 666,298 2,112,559 1,884,312  
Segments | North America Steel Group | Downstream products          
Segment Reporting Information [Line Items]          
Net sales 564,242 506,639 1,601,255 1,462,696  
Segments | North America Steel Group | Construction products          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Segments | North America Steel Group | Ground stabilization solutions          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Segments | North America Steel Group | Other          
Segment Reporting Information [Line Items]          
Net sales 56,096 58,226 170,140 161,680  
Segments | North America Steel Group | Precast Products          
Segment Reporting Information [Line Items]          
Net sales 0   0    
Segments | Construction Solutions Group          
Segment Reporting Information [Line Items]          
Net sales 394,574 197,454 907,276 525,733  
Cost of goods sold 288,305 143,968 676,789 393,942  
Selling, general and administrative expenses 64,674 42,737 165,331 121,461  
Depreciation and amortization 44,010 11,814 94,694 33,366  
Asset impairments   785   785  
Unrealized loss on undesignated commodity hedges 0 0 0 0  
Assets 3,500,235 866,444 3,500,235 866,444  
Capital expenditures 23,730 6,889 48,098 26,535  
Segments | Construction Solutions Group | Raw materials          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Segments | Construction Solutions Group | Steel products          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Segments | Construction Solutions Group | Downstream products          
Segment Reporting Information [Line Items]          
Net sales 45,303 46,002 118,001 119,559  
Segments | Construction Solutions Group | Construction products          
Segment Reporting Information [Line Items]          
Net sales 81,406 78,219 245,744 219,931  
Segments | Construction Solutions Group | Ground stabilization solutions          
Segment Reporting Information [Line Items]          
Net sales 85,779 68,560 208,252 173,266  
Segments | Construction Solutions Group | Other          
Segment Reporting Information [Line Items]          
Net sales 9,220 4,673 20,809 12,977  
Segments | Construction Solutions Group | Precast Products          
Segment Reporting Information [Line Items]          
Net sales 172,866   314,470    
Segments | Europe Steel Group          
Segment Reporting Information [Line Items]          
Net sales 291,235 247,590 738,899 655,026  
Cost of goods sold 258,948 245,297 702,179 631,848  
Selling, general and administrative expenses 7,561 8,102 22,357 20,254  
Depreciation and amortization 9,060 8,672 27,267 25,291  
Asset impairments   0   3  
Unrealized loss on undesignated commodity hedges 0 0 0 0  
Assets 798,619 731,845 798,619 731,845  
Capital expenditures 8,813 6,134 33,810 26,152  
Segments | Europe Steel Group | Raw materials          
Segment Reporting Information [Line Items]          
Net sales 7,610 6,501 18,921 16,927  
Segments | Europe Steel Group | Steel products          
Segment Reporting Information [Line Items]          
Net sales 235,187 198,228 593,792 519,709  
Segments | Europe Steel Group | Downstream products          
Segment Reporting Information [Line Items]          
Net sales 36,781 33,639 92,005 92,551  
Segments | Europe Steel Group | Construction products          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Segments | Europe Steel Group | Ground stabilization solutions          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Segments | Europe Steel Group | Other          
Segment Reporting Information [Line Items]          
Net sales 11,657 9,222 34,181 25,839  
Segments | Europe Steel Group | Precast Products          
Segment Reporting Information [Line Items]          
Net sales 0   0    
Segments | Corporate and Other          
Segment Reporting Information [Line Items]          
Net sales 8,055 12,654 30,635 35,432  
Depreciation and amortization 2,339 2,621 6,944 7,544  
Assets 724,472 1,118,426 724,472 1,118,426  
Capital expenditures 406 2,738 4,937 6,839  
Segments | Corporate and Other | Raw materials          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Segments | Corporate and Other | Steel products          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Segments | Corporate and Other | Downstream products          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Segments | Corporate and Other | Construction products          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Segments | Corporate and Other | Ground stabilization solutions          
Segment Reporting Information [Line Items]          
Net sales 0 0 0 0  
Segments | Corporate and Other | Other          
Segment Reporting Information [Line Items]          
Net sales 8,055 12,654 30,635 35,432  
Segments | Corporate and Other | Precast Products          
Segment Reporting Information [Line Items]          
Net sales 0   0    
Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Net sales 33,223 35,611 95,581 94,503  
Intersegment Eliminations | North America Steel Group          
Segment Reporting Information [Line Items]          
Net sales 20,538 17,317 62,483 49,927  
Intersegment Eliminations | Construction Solutions Group          
Segment Reporting Information [Line Items]          
Net sales 11,806 17,564 30,562 42,610  
Intersegment Eliminations | Europe Steel Group          
Segment Reporting Information [Line Items]          
Net sales 879 730 2,536 1,966  
Intersegment Eliminations | Segment Eliminations          
Segment Reporting Information [Line Items]          
Net sales $ (33,223) $ (35,611) $ (95,581) $ (94,503)