Goodwill and Intangible Assets - Intangible Assets by Major Class Subject to Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Intangible assets:
Original Cost	$ 17,334	$ 17,334
Accumulated Amortization	16,773	16,455
Impairment	0	0
Currency Translation	(84)	(5)
Net Book Value	$ 477	$ 874
Trade name
Intangible assets:
Weighted average life	8 years	8 years
Original Cost	$ 1,876	$ 1,876
Accumulated Amortization	1,868	1,850
Impairment	0	0
Currency Translation	0	0
Net Book Value	$ 8	$ 26
Technology asset
Intangible assets:
Weighted average life	5 years	5 years
Original Cost	$ 1,869	$ 1,869
Accumulated Amortization	1,869	1,869
Impairment	0	0
Currency Translation	0	0
Net Book Value	$ 0	$ 0
Customer relationships
Intangible assets:
Weighted average life	10 years	10 years
Original Cost	$ 13,589	$ 13,589
Accumulated Amortization	13,036	12,736
Impairment	0	0
Currency Translation	(84)	(5)
Net Book Value	$ 469	$ 848