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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 27, 2014 | Dec. 28, 2013
Commitments and Contingencies Disclosure [Abstract] |  |
Franchisee leases sold with recourse provisions | $ 2.7 | $ 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_
Data Type: | xbrli:durationItemType
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration