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Income Taxes - Schedule of Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]        
Computed expected income tax expense   $ 4,979 $ 4,366 $ 4,759
State income taxes, net of federal benefit   291 730 221
Transfer of deferred tax liabilities with subsidiaries sold   (841)
Permanent differences   108 (109) 131
Change in deferred tax liability rate   1,329
Reserve for uncertain tax position   406 240
Tax credits   (564) (2,013)
Other   (190)
Total income tax expense $ 1,300 $ 6,359 $ 2,373 $ 5,111