SEGMENT INFORMATION - Schedule of Segment Information of Capital Expenditures and Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Capital Expenditures	$ 107,108	$ 149,861	$ 218,888
Total Assets	2,851,922	3,021,403	2,935,009
Operating Segments | Electrical
Segment Reporting Information [Line Items]
Capital Expenditures	56,521	92,682	137,485
Total Assets	1,456,834	1,773,937	1,715,419
Operating Segments | Safety & Infrastructure
Segment Reporting Information [Line Items]
Capital Expenditures	34,084	45,758	69,475
Total Assets	721,156	769,527	753,821
Unallocated
Segment Reporting Information [Line Items]
Capital Expenditures	16,503	11,421	11,928
Total Assets	$ 673,932	$ 477,939	$ 465,769