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Goodwill and Intangible Assets - Goodwill RollForward (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
GoodwillRollForward
Goodwill, Beginning Balance	$ 46,693	$ 39,936
Acquisitions	4,240	7,121
Divestitures	0	(51)
Goodwill Purchase Accounting Adjustments	(231)	(313)
Goodwill, Ending Balance	50,702	46,693
Commercial & Industrial [Member]
GoodwillRollForward
Goodwill, Beginning Balance	7,176	3,806
Acquisitions	0	3,411
Divestitures	0	0
Goodwill Purchase Accounting Adjustments	(200)	(41)
Goodwill, Ending Balance	6,976	7,176
Communications [Member]
GoodwillRollForward
Goodwill, Beginning Balance	0	0
Acquisitions	2,892	0
Divestitures	0	0
Goodwill Purchase Accounting Adjustments	(76)	0
Goodwill, Ending Balance	2,816	0
Infrastructure Solutions [Member]
GoodwillRollForward
Goodwill, Beginning Balance	30,886	27,499
Acquisitions	0	3,710
Divestitures	0	(51)
Goodwill Purchase Accounting Adjustments	45	(272)
Goodwill, Ending Balance	30,931	30,886
Residential [Member]
GoodwillRollForward
Goodwill, Beginning Balance	8,631	8,631
Acquisitions	1,348	0
Divestitures	0	0
Goodwill Purchase Accounting Adjustments	0	0
Goodwill, Ending Balance	$ 9,979	$ 8,631

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 350
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-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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