Goodwill and Intangible Assets - Intangible Assets by Major Class Subject to Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Intangible assets:
Original Cost	$ 17,334	$ 17,334
Accumulated Amortization	17,091	16,773
Impairment	0	0
Currency Translation	35	(84)
Net Book Value	$ 278	$ 477
Trade name
Intangible assets:
Weighted average life	8 years	8 years
Original Cost	$ 1,876	$ 1,876
Accumulated Amortization	1,876	1,868
Impairment	0	0
Currency Translation	0	0
Net Book Value	$ 0	$ 8
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	13,346	13,036
Impairment	0	0
Currency Translation	35	(84)
Net Book Value	$ 278	$ 469