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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
	Jan. 03, 2015	Dec. 28, 2013
Voluntary Employees Beneficiary Association Plan Assets [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	$ 3.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember	$ 3.2us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember
Unrealized gains attributable to assets held	0.3sna_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainsLossesAttributableToAssetsHeld / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember	0.4sna_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainsLossesAttributableToAssetsHeld / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember
Ending balance	$ 3.9us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember	$ 3.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = sna_HedgeFundInterestsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = sna_VoluntaryEmployeesBeneficiaryAssociationPlanAssetsMember

X

- 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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Period Type:	duration

X

- Details

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

X

- 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

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