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 |