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Income Taxes (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]      
Effective income tax rate 21.20% 20.80% 20.00%
Valuation allowance $ 80,000 $ 72,000  
Unrecognized tax benefits $ 0 $ 0 $ 0
Open tax year 2019