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Business Combination (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
May 21, 2015 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Apr. 15, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Cash Paid for Acquisition |  |  | $ 59,544 | $ 3,113 | $ 0 |
Goodwill Tax Basis |  |  | 39,936 | $ 17,249 | $ 14,993 |
Amount From Credit Facility Used For Acquisitions |  |  | $ 20,000 |  |  |
Interest Rate During Period |  |  | 2.50% |  |  |
Goodwill Written Off Related To Sale Of Business Unit |  |  | $ 577 |  |  |
Infrastructure Solutions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill Written Off Related To Sale Of Business Unit |  |  | 577 |  |  |
Loss on Sale of Assets From Divestiture |  |  | 821 |  |  |
Assets held for sale |  |  |  |  |  | $ 2,200
AcquisitionRelatedCostsMember |  |  |  |  |  |
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |  |  |  |
Business Combination Acquisition Related Costs |  |  | $ 681 |  |  |
Business Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of Businesses Acquired |  |  | 4 |  |  |
Total Consideration Transferred |  |  | $ 59,592 |  |  |
Cash Purchase Consideration |  |  | 59,144 |  |  |
Cash Paid for Acquisition |  |  | 58,448 |  |  |
Additional Consideration To Be Paid |  |  | 696 |  |  |
Business Combination Acquired Receivables |  |  | 9,000 |  |  |
Business Combination Acquired Receivables Estimated Uncollectible |  |  | 518 |  |  |
Revenues From Acquisitions |  |  | 34,367 |  |  |
Operating Income From Acquisitions |  |  | $ 3,527 |  |  |
Business Acquisition Southern Rewinding [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Name of Acquired Business |  |  | Southern Industrial Sales and Services, Inc. (“Southern Rewinding”) |  |  |
Description of Acquired Business |  |  | a Columbus, Georgia-based motor repair and related field services company |  |  |
Date of Acquisition Agreement |  |  | May 21, 2015 |  |  |
Total Consideration Transferred | $ 3,937 |  |  |  |  |
Cash Purchase Consideration | 3,137 |  |  |  |  |
Cash Paid for Acquisition |  |  | $ 400 |  |  |
Working Capital Transfer | $ 1,065 |  |  |  |  |
Business Acquisition Southern Rewinding [Member] | Infrastructure Solutions [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Additional Consideration To Be Paid |  | $ 400 |  |  |  |
Business Acquisition Technibus [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Name of Acquired Business |  |  | Technibus, Inc. (“Technibus”) |  |  |
Description of Acquired Business |  |  | a Canton, Ohio based provider of custom engineered, metal enclosed bus duct solutions |  |  |
Date of Acquisition Agreement |  |  | Jun. 15, 2016 |  |  |
Goodwill Tax Basis |  |  | $ 15,305 |  |  |
Businessacquisition Str [Member] | Commercial & Industrial [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Name of Acquired Business |  |  | STR Mechanical, LLC (“STR”) |  |  |
Description of Acquired Business |  |  | We acquired 80% of the membership interests in STR, a Charlotte, North Carolina-based provider of commercial and industrial mechanical services, including maintenance, repair, and replacement services, and temperature control system installations |  |  |
Minority Interest Ownership Percentage By Parent |  |  | 80.00% |  |  |
Date of Acquisition Agreement |  |  | Apr. 27, 2016 |  |  |
Business Acquisition Calumet [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Name of Acquired Business |  |  | Calumet Armature & Electric, LLC (“Calumet”) |  |  |
Description of Acquired Business |  |  | an Illinois-based provider of design, manufacturing, assembly, and repair services of electric motors for the industrial and mass transit markets |  |  |
Date of Acquisition Agreement |  |  | Oct. 30, 2015 |  |  |
Minimum Contingent Consideration Value |  |  | $ 448 |  |  |
Contingent Consideration Fair Value |  |  | 1,100 |  |  |
Maximum Contingent Consideration Value |  |  | $ 2,250 |  |  |
Business Acquisition Shanahan [Member] | Commercial & Industrial [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Name of Acquired Business |  |  | Shanahan Mechanical and Electrical, Inc. (“Shanahan”) |  |  |
Description of Acquired Business |  |  | a Nebraska-based provider of mechanical and electrical contracting services |  |  |
Date of Acquisition Agreement |  |  | Nov. 20, 2015 |  |  |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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