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Mergers and Acquisitions - Narrative (Details) $ in Millions |  | 3 Months Ended
--- | --- | ---
Oct. 02, 2017 USD ($) employee | Apr. 01, 2018 employee | Dec. 31, 2017 USD ($) | Apr. 02, 2017 USD ($) employee
Mergers and Acquisitions |  |  |  |
Contingent earn-out liability |  |  | $ 21.1 |
Aggregate maximum of contingent consideration |  |  | $ 28.9 |
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 | $ 38.4 |  |  |
Cash paid to the former owners | 19.0 |  |  |
Amount held in escrow | 1.0 |  |  |
Contingent earn-out liability | 18.4 |  |  |
Aggregate maximum of contingent consideration | $ 20.0 |  |  |
Earn-out period | 3 years |  |  |
Eco Logical Australia |  |  |  |
Mergers and Acquisitions |  |  |  |
Number of employees acquired in acquisition | employee |  |  |  | 160
Fair value of acquisition purchase price |  |  |  | $ 9.9
Cash paid to the former owners |  |  |  | 8.3
Contingent earn-out liability |  |  |  | 1.6
Aggregate maximum of contingent consideration |  |  |  | $ 1.7
Earn-out period |  |  |  | 2 years
Norman Disney & Young | Subsequent Event | Scenario, Forecast |  |  |  |
Mergers and Acquisitions |  |  |  |
Number of employees acquired in acquisition | employee |  | 700 |  |

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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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