Supporting Financial Information - Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ (1,615)	$ (1,058)
Goodwill, Gross		0
Intangible Assets, Gross (Excluding Goodwill)		324
Amortization of Intangible Assets	(881)
Goodwill	25,989		$ 35,000
Finite-Lived Intangible Assets, Net	16,008
Goodwill and other intangible assets, net	41,997	42,304
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	(1,523)	(993)
Finite-Lived Intangible Assets, Gross		300
Amortization of Intangible Assets	(830)
Finite-Lived Intangible Assets, Net	15,103
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	(44)	(65)
Finite-Lived Intangible Assets, Gross		45
Amortization of Intangible Assets	(24)
Finite-Lived Intangible Assets, Net	436
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	(48)	0
Finite-Lived Intangible Assets, Gross		$ (21)
Amortization of Intangible Assets	(27)
Finite-Lived Intangible Assets, Net	$ 469