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Updates to Significant Accounting Policies - Revenue Recognition And Deferred Revenue Narratives (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 28, 2018 | Dec. 29, 2017
Deferred Revenue Arrangement [Line Items] |  |
Allowance for Doubtful Accounts Receivable, Current | $ 5.6 | $ 3.6
Maximum |  |
Deferred Revenue Arrangement [Line Items] |  |
Warranty Period On Products Sold | 2 years |
Capitalized Contract Cost, Amortization Period | 7 years |
Maximum | Subscription Arrangement [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue Contract Term | 5 years |
Minimum |  |
Deferred Revenue Arrangement [Line Items] |  |
Warranty Period On Products Sold | 1 year |
Capitalized Contract Cost, Amortization Period | 3 years |
Minimum | Subscription Arrangement [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue Contract Term | 1 month |

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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054 + Details
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- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
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