Supporting Financial Information - Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Sep. 30, 2017
Finite Lived Intangible Assets [Roll Forward]
Goodwill	$ 25,989	$ 26,000
Intangible assets, including goodwill, gross balance	43,612
Accumulated amortization finite-lived intangibles, beginning balance	(2,496)
Current period amortization	(440)
Accumulated amortization finite-lived intangibles, ending balance	(2,936)
Finite-lived intangibles, net balance	14,687
Intangible assets, including goodwill, net balance	$ 40,676	$ 41,116
Estimated useful live of finite-lived intangible assets	10 years
Customer Relationships [Member]
Finite Lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross balance	$ 16,626
Accumulated amortization finite-lived intangibles, beginning balance	(2,355)
Current period amortization	(416)
Accumulated amortization finite-lived intangibles, ending balance	(2,771)
Finite-lived intangibles, net balance	13,855
Noncompete Agreements [Member]
Finite Lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross balance	480
Accumulated amortization finite-lived intangibles, beginning balance	(68)
Current period amortization	(12)
Accumulated amortization finite-lived intangibles, ending balance	(80)
Finite-lived intangibles, net balance	400
Trade Names [Member]
Finite Lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross balance	517
Accumulated amortization finite-lived intangibles, beginning balance	(73)
Current period amortization	(12)
Accumulated amortization finite-lived intangibles, ending balance	(85)
Finite-lived intangibles, net balance	$ 432