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SEGMENT INFORMATION - Schedule of Reconciliation of Net Sales (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Net sales $ 2,850,378 $ 3,202,053 $ 3,518,761
Cost of sales (2,174,286) (2,124,214) (2,179,260)
Selling, general and administrative (396,609) (397,544) (388,206)
Operating Segments      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 439,703 818,323 1,108,083
Electrical      
Segment Reporting Information [Line Items]      
Net sales 1,998,209 2,354,958 2,675,050
Electrical | Operating Segments      
Segment Reporting Information [Line Items]      
Net sales 1,998,219 2,354,978 2,675,074
Cost of sales (1,509,170) (1,448,980) (1,503,555)
Selling, general and administrative (204,062) (220,136) (209,947)
Other Segment Items 45,525 42,479 43,281
Adjusted EBITDA 330,512 728,341 1,004,853
Safety & Infrastructure      
Segment Reporting Information [Line Items]      
Net sales 852,169 847,095 843,711
Safety & Infrastructure | Operating Segments      
Segment Reporting Information [Line Items]      
Net sales 853,369 849,077 844,158
Cost of sales (670,374) (677,224) (676,258)
Selling, general and administrative (102,706) (104,135) (84,401)
Other Segment Items 28,902 22,264 19,732
Adjusted EBITDA $ 109,191 $ 89,982 $ 103,231