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Property And Equipment (Summary of Estimated Service Lives Of Property And Equipment) (Detail)	12 Months Ended
	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

X

- 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

X

- Details

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