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Deferred Costs To Obtain Customer Contracts Narratives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 28, 2018 | Sep. 29, 2017 | Sep. 28, 2018 | Sep. 29, 2017 | Dec. 29, 2017
Deferred Commission [Member] |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Impairment Loss | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
Other Noncurrent Assets [Member] |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net | 37.2 |  | 37.2 |  | $ 35.0
Sales And Marketing Expense [Member] |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Amortization | $ 6.2 | $ 5.3 | $ 17.2 | $ 15.2 |

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Details
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