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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]        
Computed expected income tax expense   $ 4,576 $ 4,979 $ 4,366
State income taxes, net of federal benefit   804 291 730
Deferred taxes on subsidiaries acquired/sold   709 (841)
Permanent differences   85 108 (109)
Change in deferred tax liability rate   (8,832) 1,329
Reserve for uncertain tax position   406 240
Tax credits   (808) (564) (2,013)
Other   348 (190)
Total income tax expense (benefit) $ 1,300 $ (3,118) $ 6,359 $ 2,373