Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 3,222
Finite-Lived Intangible Asset, Useful Life	9 years 3 months 18 days
Finite-Lived Intangible Assets, Gross	$ 39,662	$ 41,625
Finite-Lived Intangible Assets, Accumulated Amortization	(13,039)	(11,035)
Intangible Assets, Net (Excluding Goodwill)	26,623	30,590
Amortization of Intangible Assets	3,950	4,101	$ 5,766
Finite-Lived Intangible Assets, Amortization Expense, Year Two	3,249
Finite-Lived Intangible Assets, Amortization Expense, Year Three	3,422
Finite-Lived Intangible Assets, Amortization Expense, Year Four	2,785
Finite-Lived Intangible Assets, Amortization Expense, Year Five	2,240
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	11,705
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	5,084	5,084
Finite-Lived Intangible Assets, Accumulated Amortization	(1,267)	(831)
Intangible Assets, Net (Excluding Goodwill)	3,817	4,253
Technical Library
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	400	400
Finite-Lived Intangible Assets, Accumulated Amortization	(121)	(101)
Intangible Assets, Net (Excluding Goodwill)	279	299
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	33,539	33,539
Finite-Lived Intangible Assets, Accumulated Amortization	(11,051)	(7,870)
Intangible Assets, Net (Excluding Goodwill)	22,488	25,669
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	40	40
Finite-Lived Intangible Assets, Accumulated Amortization	(9)	(1)
Intangible Assets, Net (Excluding Goodwill)	31	39
Construction Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	599	2,562
Finite-Lived Intangible Assets, Accumulated Amortization	(591)	(2,232)
Intangible Assets, Net (Excluding Goodwill)	$ 8	$ 330