Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	$ 36,063	$ 36,439	$ 40,690	$ 46,968	$ 49,748	$ 49,622
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	(5,760)		(6,196)
Retirement plan liability adjustment, net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	(2,204)		(2,509)
Interest rate swap agreement, net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	13		12
Total accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	$ (7,951)	$ (8,124)	$ (8,693)	$ (9,216)	$ (9,100)	$ (9,079)