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Segments Information - Summary of Revenues by Business Lines (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 30, 2018
Segment Reporting Information [Line Items] |  |
Revenues | $ 904,405 | $ 754,679
Federal Solution Segment |  |
Segment Reporting Information [Line Items] |  |
Revenues | 422,812 | 291,335
Federal Solution Segment | Cyber & Intelligence |  |
Segment Reporting Information [Line Items] |  |
Revenues | 76,110 | 44,367
Federal Solution Segment | Defense |  |
Segment Reporting Information [Line Items] |  |
Revenues | 134,990 | 73,540
Federal Solution Segment | Mission Solutions |  |
Segment Reporting Information [Line Items] |  |
Revenues | 68,090 | 74,149
Federal Solution Segment | Engineered Systems |  |
Segment Reporting Information [Line Items] |  |
Revenues | 114,666 | 99,279
Federal Solution Segment | Geospatial |  |
Segment Reporting Information [Line Items] |  |
Revenues | 28,956 | 0
Critical Infrastructure |  |
Segment Reporting Information [Line Items] |  |
Revenues | 481,593 | 463,344
Critical Infrastructure | Connect Communities |  |
Segment Reporting Information [Line Items] |  |
Revenues | 156,876 | 160,913
Critical Infrastructure | Mobility Solutions |  |
Segment Reporting Information [Line Items] |  |
Revenues | 269,114 | 255,679
Critical Infrastructure | Industrial |  |
Segment Reporting Information [Line Items] |  |
Revenues | $ 55,603 | $ 46,752

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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