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Postretirement Plans (Summary Of Target Allocation By Asset Category And Fair Value Of Plan Assets) (Detail) (Voluntary Employees Beneficiary Association Plan Assets [Member], Private Equity Partnership Interests [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 29, 2012 | Dec. 31, 2011
Voluntary Employees Beneficiary Association Plan Assets [Member] | Private Equity Partnership Interests [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | $ 3.0 | $ 2.8
Unrealized gains attributable to assets held | 0.2 | 0.2
Ending balance | $ 3.2 | $ 3.0

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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
Name: | sna_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainsLossesAttributableToAssetsHeld
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + 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=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant