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Deferred costs to obtain customer contracts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Deferred Commission [Member] |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Capitalized Contract Cost, Impairment Loss | $ 0.0 | $ 0.0 | $ 0.0
Other Noncurrent Assets [Member] |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Capitalized Contract Cost, Net | 41.3 | 35.0 | 30.3
Selling and Marketing Expense [Member] |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Capitalized Contract Cost, Amortization | $ 23.6 | $ 21.3 | $ 18.7

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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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Period Type: | duration

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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- Details
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- Details
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