Income Taxes - Schedule of Provision for Income Taxes (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]
Current Federal		$ 2,989	$ 260	$ 894
Current State and local		1,097	970	335
Total current income tax expense		4,086	1,230	1,229
Deferred Federal		1,545	1,110	3,771
Deferred State and local		728	33	111
Total deferred income tax expense		2,273	1,143	3,882
Total income tax expense	$ 1,300	$ 6,359	$ 2,373	$ 5,111