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Business Combinations (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Sep. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Cash Paid for Acquisition |  |  | $ 14,659 | $ 59,698 |
Contingent Consideration Fair Value | $ 1,347 |  | $ 1,347 |  | $ 1,100
2017 Business Acquisitions [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number Of Businesses Acquired |  |  | 2 |  |
Total Consideration Transferred |  |  | $ 15,871 |  |
Cash Purchase Consideration |  |  | 15,139 |  |
Cash Paid for Acquisition |  |  | 14,739 |  |
Additional Consideration To Be Paid |  |  | 400 |  |
Contingent Consideration Fair Value | 732 |  | 732 |  |
Revenues From Acquisitions | 5,649 |  | 7,047 |  |
Operating Income From Acquisitions | (104) |  | (150) |  |
2016 Business Acquisitions [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number Of Businesses Acquired |  |  |  | 4 |
Total Consideration Transferred |  |  |  | $ 59,592 |
Contingent Consideration Fair Value | 614 |  | 614 |  |
Contingent Consideration Payment |  |  | $ 535 |  |
Revenues From Acquisitions |  | $ 10,649 |  | 19,613 |
Operating Income From Acquisitions |  | $ 1,193 |  | $ 1,841 |
Business Acquisition Technibus [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Name of Acquired Business |  |  | Technibus, Inc. |  |
Description of Acquired Business |  |  | a Canton, Ohio based provider of custom engineered, metal enclosed bus duct solutions |  |
Date of Acquisition Agreement |  |  | Jun. 15, 2016 |  |
Business Acquisition STR [Member] | Commercial & Industrial [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Name of Acquired Business |  |  | STR Mechanical, LLC |  |
Description of Acquired Business |  |  | a Charlotte, North Carolina-based provider of commercial and industrial mechanical services |  |
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 |  |
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 |  |
Contingent Consideration Fair Value | $ 614 |  | $ 614 |  | $ 1,100
Contingent Consideration Payment |  |  | $ 535 |  |
Business Acquisition Shanahan [Member] | Commercial & Industrial [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Name of Acquired Business |  |  | Shanahan Mechanical and Electrical, Inc. |  |
Description of Acquired Business |  |  | a Nebraska-based provider of mechanical and electrical contracting services |  |
Date of Acquisition Agreement |  |  | Nov. 20, 2015 |  |
Freeman Acquisition [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date of Acquisition Agreement |  |  | Mar. 16, 2017 |  |
Technical Services Acquisition [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 |  |

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