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Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2019	Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 39,662	$ 41,625
Finite-Lived Intangible Assets, Accumulated Amortization	(12,127)	(11,035)
Intangible Assets, Net (Excluding Goodwill)	27,535	30,590
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	(1,163)	(831)
Intangible Assets, Net (Excluding Goodwill)	$ 3,921	$ 4,253
Trademarks and Trade Names [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Trademarks and Trade Names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years	20 years
Technical Library
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years	20 years
Finite-Lived Intangible Assets, Gross	$ 400	$ 400
Finite-Lived Intangible Assets, Accumulated Amortization	(116)	(101)
Intangible Assets, Net (Excluding Goodwill)	284	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	(10,256)	(7,870)
Intangible Assets, Net (Excluding Goodwill)	$ 23,283	$ 25,669
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years	6 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years	15 years
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Finite-Lived Intangible Assets, Gross	$ 40	$ 40
Finite-Lived Intangible Assets, Accumulated Amortization	(7)	(1)
Intangible Assets, Net (Excluding Goodwill)	$ 33	$ 39
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	1 year
Finite-Lived Intangible Assets, Gross	$ 378	$ 378
Finite-Lived Intangible Assets, Accumulated Amortization	(362)	(176)
Intangible Assets, Net (Excluding Goodwill)	$ 16	$ 202
Construction Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	1 year
Finite-Lived Intangible Assets, Gross	$ 221	$ 2,184
Finite-Lived Intangible Assets, Accumulated Amortization	(223)	(2,056)
Intangible Assets, Net (Excluding Goodwill)	$ (2)	$ 128

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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