Goodwill and Intangible Assets - Intangible Assets by Major Class Subject to Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Intangible assets:
Original Cost	$ 17,334	$ 17,334
Accumulated Amortization	15,405	13,906
Impairment	0	0
Currency Translation	(39)	(108)
Net Book Value	$ 1,890	$ 3,320
Trade name
Intangible assets:
Weighted average life	8 years	8 years
Original Cost	$ 1,876	$ 1,876
Accumulated Amortization	1,729	1,503
Impairment	0	0
Currency Translation	(12)	(13)
Net Book Value	$ 135	$ 360
Technology asset
Intangible assets:
Weighted average life	5 years	5 years
Original Cost	$ 1,869	$ 1,869
Accumulated Amortization	1,843	1,544
Impairment	0	0
Currency Translation	(24)	(28)
Net Book Value	$ 2	$ 297
Customer relationships
Intangible assets:
Weighted average life	10 years	10 years
Original Cost	$ 13,589	$ 13,589
Accumulated Amortization	11,833	10,859
Impairment	0	0
Currency Translation	(3)	(67)
Net Book Value	$ 1,753	$ 2,663