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Postretirement Plans - Summary of Changes in Fair Value of Assets With Level 3 Inputs (Detail) (Voluntary Employees Beneficiary Association Plan Assets [Member], Hedge Funds [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013
Voluntary Employees Beneficiary Association Plan Assets [Member] | Hedge Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | $ 3.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember | $ 3.2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember
Unrealized gains attributable to assets held | 0.3 sna_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainsLossesAttributableToAssetsHeld / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember | 0.4 sna_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainsLossesAttributableToAssetsHeld / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember
Ending balance | $ 3.9 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember | $ 3.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Unrealized Gains (Losses) Attributable To Assets Held + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant