Operations and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Selling, general, and administrative expenses include net foreign currency transaction gain (loss)	$ 1,020,000	$ (1,450,000)	$ 1,986,000
Additional asset impairment charges	0	0	0
Additional asset impairment charges, intangible assets	0	0	$ 0
Increase in cash provided by operating activities as result of factoring activities	$ 26,273,000	$ 35,296,000