Operations and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Selling, general, and administrative expenses include net foreign currency transaction gain (loss)	$ (1,986,000)	$ 194,000	$ (1,018,000)
Additional asset impairment charges	0
Additional asset impairment charges, intangible assets	$ 0