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Operations and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Selling, general, and administrative expenses include net foreign currency transaction gain (loss)	$ 194,000	$ (1,018,000)	$ (1,608,000)
Impairment loss, Goodwill	8,640,000
Additional asset impairment charges	0
Impairment of intangible assets	200,000
Additional asset impairment charges, intangible assets	0
Disposal group impairment charges	$ 22,900,000

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