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Acquisitions - Schedule of Supplemental Pro Forma Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 29, 2018 | Jun. 30, 2019 | Jun. 29, 2018
Polaris Alpha |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Pro forma revenue |  | $ 968,220 |  | $ 1,808,707
Pro forma net income including noncontrolling interests |  | 116,288 |  | 126,819
OGSystems |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Pro forma revenue | $ 985,742 | 925,561 | $ 1,892,102 | 1,707,779
Pro forma net income including noncontrolling interests | $ 40,145 | $ 141,943 | $ 57,603 | $ 157,682

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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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