Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	$ 46,968	$ 49,748	$ 49,622	$ 48,337	$ 47,708	$ 45,523
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	(5,922)		(5,359)
Retirement plan liability adjustment, net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	(3,294)		(3,720)
Total accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	$ (9,216)	$ (9,100)	$ (9,079)	$ (12,772)	$ (13,062)	$ (13,468)