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Business Segments - Narrative (Details) $ in Thousands				3 Months Ended		9 Months Ended		13 Months Ended
	Nov. 17, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($) segment	Sep. 30, 2024 USD ($)
Segment Reporting Information
Number of reportable segments | segment						2	3
Proceeds from business dispositions						$ 0	$ 7,706
Loss on asset divestitures						0	3,074
Gain on sale of former joint venture facility				$ 0	$ 0	3,477	0
Total net sales				137,466	145,345	402,582	408,867
Exit costs incurred				(188)	(151)	(525)	2,782
Cougar purchase accounting adjustment
Segment Reporting Information
Consideration transferred to acquire operating assets	$ 1,644
Asset acquisition, contingent consideration, liability	$ 160
Disposal Group, Not Discontinued Operations | Bridge Grid Deck Product
Segment Reporting Information
Proceeds from business dispositions						1,300
Loss on asset divestitures						(815)
Total net sales				921	$ 283	2,888	$ 3,749
Exit costs incurred				$ 0		$ 0		$ 1,476
Personnel expenses								740
Inventory write-down								474
Other exit costs								$ 262
Coatings and Measurement
Segment Reporting Information
Proceeds from business dispositions			$ 5,344
Rail Products
Segment Reporting Information
Proceeds from business dispositions		$ 2,362
Loss on asset divestitures		$ 1,009	$ 2,065

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