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Postretirement Plans - Summary of Amounts Included in Accumulated Other Comprehensive Income on Accompanying Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Dec. 30, 2017 | Dec. 31, 2016
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U.S. Postretirement Health Care Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net gain, net of tax | $ 4.2 | $ 4.8

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- Definition Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), net gains (losses), net of tax + References No definition available. + Details
Name: | sna_PensionAndOtherPostretirementBenefitPlansAccumulatedOtherComprehensiveIncomeLossNetGainsLossesNetOfTax
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_DefinedBenefitPostretirementHealthCoverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |