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Postretirement Plans - Summary of Amounts Included in Accumulated Other Comprehensive Income on Accompanying Consolidated Balance Sheets (Detail) (U.S. Postretirement Health Care Plans [Member], USD $) In Millions, unless otherwise specified | Jan. 03, 2015 | Dec. 28, 2013
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U.S. Postretirement Health Care Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net gain (loss), net of tax | $ 2.4 sna_PensionAndOtherPostretirementBenefitPlansAccumulatedOtherComprehensiveIncomeLossNetGainsLossesNetOfTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember | $ 4.2 sna_PensionAndOtherPostretirementBenefitPlansAccumulatedOtherComprehensiveIncomeLossNetGainsLossesNetOfTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember

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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
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Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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