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Acquisitions and Divestitures - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2018 USD ($) | Jul. 01, 2018 USD ($) | Apr. 01, 2018 USD ($) employee | Dec. 31, 2017 USD ($) employee | Jan. 01, 2017 | Sep. 30, 2018 USD ($)
Mergers and Acquisitions |  |  |  |  |  |
Contingent earn-out liability | $ 29,000,000 |  |  |  |  |
Aggregate maximum of contingent consideration | 52,200,000 |  |  |  |  |
Contingent earn-out liability adjustment | $ 0 |  |  | $ 0 |  |
Minimum |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Earn-out period | 2 years |  |  |  |  |
Minimum | Existing customer contracts |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Useful life of intangible assets | 1 year |  |  |  |  |
Minimum | Trade names |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Useful life of intangible assets | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Earn-out period | 3 years |  |  |  |  |
Maximum | Existing customer contracts |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Useful life of intangible assets | 10 years |  |  |  |  |
Maximum | Trade names |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Useful life of intangible assets | 5 years |  |  |  |  |
Glumac |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Number of employees acquired in acquisition | employee |  |  |  | 300 |  |
Fair value of acquisition purchase price |  |  |  | $ 38,400,000 |  |
Cash paid to the former owners |  |  |  | 20,000,000 |  |
Contingent earn-out liability |  |  |  | 18,400,000 |  |
Aggregate maximum of contingent consideration |  |  |  | $ 20,000,000 |  |
Contingent consideration achievement period |  |  |  |  | 3 years |
Norman Disney & Young |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Number of employees acquired in acquisition | employee |  |  | 700 |  |  |
Fair value of acquisition purchase price |  |  | $ 56,100,000 |  |  |
Cash paid to the former owners |  |  | 46,900,000 |  |  |
Contingent earn-out liability |  |  | 7,600,000 |  |  |
Amount held in escrow |  |  | 1,600,000 |  |  |
Aggregate maximum of contingent consideration |  |  | $ 20,200,000 |  |  |
Earn-out period |  |  | 3 years |  |  |
Non-core field services business | Disposed of by sale |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Proceeds from sale of divested business |  | $ 30,200,000 |  |  |  |
Revenue from wired and fiber optic communication and infrastructure projects |  | $ 70,000,000 |  |  |  |
Loss on disposition of business |  |  |  |  |  | $ 1,700,000

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