GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details) - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Roll Forward]
Balance at beginning of period	$ 314,000,000	$ 311,106,000
Impairment	(18,885,000)	0	$ (1,721,000)
Divestiture	(755,000)
Exchange rate effects	125,000	2,894,000
Balance at end of period	294,485,000	314,000,000	311,106,000
Electrical
Goodwill [Roll Forward]
Balance at beginning of period	261,284,000	258,427,000
Impairment	0
Divestiture	(755,000)
Exchange rate effects	314,000	2,857,000
Balance at end of period	260,843,000	261,284,000	258,427,000
Safety & Infrastructure
Goodwill [Roll Forward]
Balance at beginning of period	52,716,000	52,679,000
Impairment	(18,885,000)
Divestiture	0
Exchange rate effects	(189,000)	37,000
Balance at end of period	$ 33,642,000	$ 52,716,000	$ 52,679,000