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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]      
Computed expected income tax expense $ 5,080 $ 4,371 $ 4,979
State income taxes, net of federal benefit 672 804 291
Deferred taxes on subsidiaries acquired/sold 709
Permanent differences 45 85 108
Change in deferred tax liability rate (8,832) 1,329
Reserve for uncertain tax position 406
Tax credits (900) (808) (564)
Other (34) 553 (190)
Total income tax expense (benefit) $ 4,863 $ (3,118) $ 6,359