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Business Combination (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Apr. 15, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |
Cash Paid for Acquisition | $ 20,213 | $ 59,544 | $ 3,113 |
Amount From Credit Facility Used For Acquisitions | $ 20,000 |  |  |
Interest Rate During Period | 2.50% |  |  |
Goodwill Written Off Related To Sale Of Business Unit | $ 51 | 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
Commercial & Industrial [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Minority Interest Ownership Percentage By Parent | 80.00% |  |  |
Goodwill Written Off Related To Sale Of Business Unit | $ 0 |  |  |
AcquisitionRelatedCostsMember |  |  |  |
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |  |
Business Combination Acquisition Related Costs | 458 |  |  |
Tax Provision Adjustment [Member] |  |  |  |
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items] |  |  |  |
Tax Provision Adjustment | 665 |  |  |
All Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent Consideration Fair Value | $ 786 |  |  |
2017 Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of Businesses Acquired | 3 |  |  |
Total Consideration Transferred | $ 20,979 |  |  |
Cash Purchase Consideration | 20,613 |  |  |
Cash Paid for Acquisition | 20,213 |  |  |
Additional Consideration To Be Paid | 400 |  |  |
Contingent Consideration Fair Value | 366 |  |  |
Goodwill Tax Basis | 3,411 |  |  |
Business Combination Acquired Receivables | 11,223 |  |  |
Business Combination Acquired Receivables Estimated Uncollectible | 0 |  |  |
Revenues From Acquisitions | 18,413 |  |  |
Operating Income From Acquisitions | $ 769 |  |  |
Business Acquisition Freeman [Member] | Infrastructure Solutions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date of Acquisition Agreement | Mar. 16, 2017 |  |  |
Businessacquisition Technical Services [Member] | Infrastructure Solutions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Minority Interest Description | Our agreements governing the operations of STR and NEXT Electric contain a provision where, at any time after five years from the acquisition date, we may purchase all or a portion of the 20% noncontrolling interest. Pursuant to this provision, we may purchase the noncontrolling interest, or, with notice, the noncontrolling interest holders may cause us to purchase their interests, for a contractually determined price based on the trailing 2 year earnings before interest, taxes, depreciation, and amortization of STR and NEXT Electric, calculated at the time of the purchase. |  |  |
Businessacquisition Technical Services [Member] | Commercial & Industrial [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Name of Acquired Business | Technical Services II, LLC |  |  |
Description of Acquired Business | a Chesapeake, Virginia-based provider of mechanical maintenance services, including commercial heating, ventilation and air conditioning, food service equipment, electrical and plumbing services |  |  |
Date of Acquisition Agreement | Jun. 15, 2017 |  |  |
Business Acquisition NEXT [Member] | Infrastructure Solutions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Minority Interest Description | Our agreements governing the operations of STR and NEXT Electric contain a provision where, at any time after five years from the acquisition date, we may purchase all or a portion of the 20% noncontrolling interest. Pursuant to this provision, we may purchase the noncontrolling interest, or, with notice, the noncontrolling interest holders may cause us to purchase their interests, for a contractually determined price based on the trailing 2 year earnings before interest, taxes, depreciation, and amortization of STR and NEXT Electric, calculated at the time of the purchase. |  |  |
Business Acquisition NEXT [Member] | Commercial & Industrial [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Name of Acquired Business | NEXT Electric, LLC |  |  |
Description of Acquired Business | a Milwaukee, Wisconsin-based electrical contractor specializing in the design, installation and maintenance of electrical systems for commercial, industrial, healthcare, water treatment and education end markets |  |  |
Date of Acquisition Agreement | Jul. 14, 2017 |  |  |

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