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Goodwil and Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 41,083	$ 40,969
Accumulated Amortization	10,631	9,556
Intangible assets, net	30,452	31,413
Trademarks And Trade Names [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	4,643	4,643
Accumulated Amortization	531	440
Intangible assets, net	$ 4,112	$ 4,203
Trademarks And Trade Names [Member] | Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	20 years	20 years
Trademarks And Trade Names [Member] | Minimum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	5 years	5 years
Technical Library [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 400	$ 400
Accumulated Amortization	86	81
Intangible assets, net	$ 314	$ 319
Technical Library [Member] | Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	20 years	20 years
Customer Relationships [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 31,229	$ 31,115
Accumulated Amortization	5,461	4,741
Intangible assets, net	$ 25,768	$ 26,374
Customer Relationships [Member] | Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	15 years	15 years
Customer Relationships [Member] | Minimum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	6 years	6 years
Order Backlog [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 2,412	$ 2,412
Accumulated Amortization	2,412	2,130
Intangible assets, net	$ 0	$ 282
Order Backlog [Member] | Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	1 year	1 year
Construction Contract Value [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 2,399	$ 2,399
Accumulated Amortization	2,141	2,164
Intangible assets, net	$ 258	$ 235
Construction Contract Value [Member] | Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	1 year	1 year

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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-Name Accounting Standards Codification
-Topic 350
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