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Goodwill and Intangible Assets - Goodwill RollForward (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2017 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 39,936
Acquisitions	5,460
Divestitures	(51)
Goodwill Purchase Accounting Adjustments	(312)
Goodwill, Ending Balance	45,033
Residential [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	8,631
Goodwill, Ending Balance	8,631
Commercial & Industrial [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	3,806
Acquisitions	1,640
Goodwill Purchase Accounting Adjustments	(41)
Goodwill, Ending Balance	5,405
Infrastructure Solutions [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	27,499
Acquisitions	3,820
Divestitures	(51)
Goodwill Purchase Accounting Adjustments	(271)
Goodwill, Ending Balance	$ 30,997

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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+ 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)
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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=73531572&loc=d3e961-128460

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 350
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