GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Sep. 30, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Goodwill — Changes in the carrying amount of goodwill are as follows:

	Segment
(in thousands)	Electrical		Safety & Infrastructure		Total
Balance as of September 30, 2023	$	258,427	$	52,679	$	311,106
Exchange rate effects	2,857		37		2,894
Balance as of September 30, 2024	$	261,284	$	52,716	$	314,000
Impairment	—		(18,885)		(18,885)
Divestiture	(755)		—		(755)
Exchange rate effects	314		(189)		125
Balance as of September 30, 2025	$	260,843	$	33,642	$	294,485

Schedule of Finite-Lived Intangible Assets

Intangible Assets — The following table provides the gross carrying value, accumulated amortization, and net carrying value for each major class of intangible assets:

		September 30, 2025						September 30, 2024
(in thousands)	Weighted Average Useful Life (Years)	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Amortizable Intangible Assets:
Customer relationships	10	$	401,771	$	(338,201)	$	63,570	$	600,317	$	(371,600)	$	228,717
Other	8	25,205		(20,797)		4,408		43,968		(25,067)		18,901
Total		426,976		(358,998)		67,978		644,285		(396,667)		247,618
Indefinite-lived Intangible Assets:
Trade names		92,780		—		92,780		92,813		—		92,813
Total		$	519,756	$	(358,998)	$	160,758	$	737,098	$	(396,667)	$	340,431

Schedule of Indefinite-Lived Intangible Assets

Intangible Assets — The following table provides the gross carrying value, accumulated amortization, and net carrying value for each major class of intangible assets:

		September 30, 2025						September 30, 2024
(in thousands)	Weighted Average Useful Life (Years)	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Amortizable Intangible Assets:
Customer relationships	10	$	401,771	$	(338,201)	$	63,570	$	600,317	$	(371,600)	$	228,717
Other	8	25,205		(20,797)		4,408		43,968		(25,067)		18,901
Total		426,976		(358,998)		67,978		644,285		(396,667)		247,618
Indefinite-lived Intangible Assets:
Trade names		92,780		—		92,780		92,813		—		92,813
Total		$	519,756	$	(358,998)	$	160,758	$	737,098	$	(396,667)	$	340,431

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Expected amortization expense for intangible assets over the next five years and thereafter is as follows (in thousands):

2026	$	24,945
2027	23,949
2028	9,035
2029	2,924
2030	2,924
2031 and thereafter	4,202