Goodwill and Intangible Assets - Intangible Assets by Major Class Subject to Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Intangible assets:
Original Cost	$ 17,334	$ 17,334
Accumulated Amortization	16,455	15,405
Impairment	0	0
Currency Translation	(5)	(39)
Net Book Value	$ 874	$ 1,890
Trade name
Intangible assets:
Weighted average life	8 years	8 years
Original Cost	$ 1,876	$ 1,876
Accumulated Amortization	1,850	1,729
Impairment	0	0
Currency Translation	0	(12)
Net Book Value	$ 26	$ 135
Technology asset
Intangible assets:
Weighted average life	5 years	5 years
Original Cost	$ 1,869	$ 1,869
Accumulated Amortization	1,869	1,843
Impairment	0	0
Currency Translation	0	(24)
Net Book Value	$ 0	$ 2
Customer relationships
Intangible assets:
Weighted average life	10 years	10 years
Original Cost	$ 13,589	$ 13,589
Accumulated Amortization	12,736	11,833
Impairment	0	0
Currency Translation	(5)	(3)
Net Book Value	$ 848	$ 1,753