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Goodwill and Intangible Assets - Goodwill RollForward (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
GoodwillRollForward |  |
Goodwill, Beginning Balance | $ 39,936 | $ 17,249
Acquisitions | 7,121 | 23,264
Divestitures | 51 | 577
Goodwill Purchase Accounting Adjustments | (313) |
Goodwill, Ending Balance | 46,693 | 39,936
Commercial & Industrial [Member] |  |
GoodwillRollForward |  |
Goodwill, Beginning Balance | 3,806 | 0
Acquisitions | 3,411 | 3,806
Divestitures | 0 |
Goodwill Purchase Accounting Adjustments | (41) |
Goodwill, Ending Balance | 7,176 | 3,806
Infrastructure Solutions [Member] |  |
GoodwillRollForward |  |
Goodwill, Beginning Balance | 27,499 | 8,618
Acquisitions | 3,710 | 19,458
Divestitures | 51 | 577
Goodwill Purchase Accounting Adjustments | (272) |
Goodwill, Ending Balance | 30,886 | 27,499
Residential [Member] |  |
GoodwillRollForward |  |
Goodwill, Beginning Balance | 8,631 | 8,631
Acquisitions | 0 | 0
Divestitures | 0 |
Goodwill Purchase Accounting Adjustments | 0 |
Goodwill, Ending Balance | $ 8,631 | $ 8,631

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- 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=64834752&loc=SL49117168-202975 + Details
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- 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 + Details
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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=73531572&loc=d3e961-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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 + Details
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