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Property And Equipment (Summary of Estimated Service Lives Of Property And Equipment) (Detail) | 12 Months Ended
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Dec. 29, 2012
Minimum [Member] | Building And Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Estimate life, years | 3 years
Minimum [Member] | Machinery, Equipment And Computer Software [Member] |
Property, Plant and Equipment [Line Items] |
Estimate life, years | 2 years
Maximum [Member] | Building And Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Estimate life, years | 50 years
Maximum [Member] | Machinery, Equipment And Computer Software [Member] |
Property, Plant and Equipment [Line Items] |
Estimate life, years | 15 years

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- Definition Estimated Service Lives Of Property And Equipment + References No definition available. + Details
Name: | sna_EstimatedServiceLivesOfPropertyAndEquipment
Namespace Prefix: | sna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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