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Business Combination (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Apr. 15, 2016 | Sep. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |
Cash Paid for Acquisition |  | $ 59,698 | $ 3,112 |  |
Contingent Consideration Fair Value | $ 780 | 780 |  |  |
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 |  |  |
Assets held for sale | 0 | 0 |  |  | $ 0
Infrastructure Solutions [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill Written Off Related To Sale Of Business Unit |  | 577 |  |  |
Loss on Sale of Assets From Divestiture |  | 828 |  |  |
Assets held for sale |  |  |  | $ 2,200 |
Acquisition Related Costs [Member] |  |  |  |  |
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 |  | $ 59,583 |  |  |
Cash Purchase Consideration |  | 59,298 |  |  |
Cash Paid for Acquisition |  | 58,448 |  |  |
Additional Consideration To Be Paid |  | 850 |  |  |
Revenues From Acquisitions | 10,649 | 19,613 |  |  |
Operating Income From Acquisitions | 1,193 | $ 1,841 |  |  |
Business Acquisition Southern Rewind [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 |  |  |
Additional Consideration To Be Paid |  | $ 400 | 800 |  |
Working Capital Transfer |  |  | $ 1,065 |  |
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 | $ 15,218 | $ 15,218 |  |  |
Business Acquisition STR [Member] | Commercial & Industrial [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Name of Acquired Business |  | An 80% interest in STR Mechanical, LLC (“STR”) |  |  |
Description of Acquired Business |  | An 80% interest in 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% | 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 | $ 448 |  |  |
Contingent Consideration Fair Value | 780 | 780 |  |  |
Maximum Contingent Consideration Value | $ 2,250 | $ 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 This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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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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