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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Dec. 28, 2013
Commitments And Contingencies Disclosure [Abstract]
Franchisee leases sold with recourse provisions	$ 5.2	$ 7.7
Minimum term required for leases to recourse (in days)	90 days

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- Definition

Franchise leases minimum term for recourse provision.

+ References

No definition available.

+ Details

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Namespace Prefix:	sna_
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Balance Type:	na
Period Type:	duration

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- Definition

Franchise leases recourse provision.

+ References

No definition available.

+ Details

Name:	sna_FranchiseLeasesRecourseProvision
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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