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SEGMENT INFORMATION - Schedule of Segment Information of Net sales and Adjusted EBITDA (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
Electrical
Segment Reporting Information [Line Items]
Net sales	1,998,209	2,354,958	2,675,050
Safety & Infrastructure
Segment Reporting Information [Line Items]
Net sales	852,169	847,095	843,711
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	439,703	818,323	1,108,083
Operating Segments | Electrical
Segment Reporting Information [Line Items]
Net sales	1,998,219	2,354,978	2,675,074
Adjusted EBITDA	330,512	728,341	1,004,853
Operating Segments | Safety & Infrastructure
Segment Reporting Information [Line Items]
Net sales	853,369	849,077	844,158
Adjusted EBITDA	109,191	89,982	103,231
Intersegment Sales
Segment Reporting Information [Line Items]
Net sales	(1,210)	(2,002)	(471)
Intersegment Sales | Electrical
Segment Reporting Information [Line Items]
Net sales	(10)	(20)	(25)
Intersegment Sales | Safety & Infrastructure
Segment Reporting Information [Line Items]
Net sales	$ (1,200)	$ (1,982)	$ (447)

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