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Revenue - Additional Information (Details) contract in Thousands, $ in Billions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2018 USD ($) | Jul. 02, 2017 USD ($) | Jul. 01, 2018 USD ($) contract | Jul. 02, 2017 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Number of active contracts | contract |  |  | 10 |
Revenue recognized in contract liability balance | $ | $ 1.1 | $ 1.2 | $ 2.6 | $ 2.9
Transferred over Time |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenue, percentage from products and services transferred to customers | 78.00% | 71.00% | 75.00% | 70.00%
Transferred at Point in Time |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenue, percentage from products and services transferred to customers | 22.00% | 29.00% | 25.00% | 30.00%

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 + Details
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