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Receivables (Components Of Finance And Contract Receivables Beyond One Year) (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 29, 2012 | Dec. 31, 2011
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unearned finance charges, finance receivables | $ 11.8 | $ 9.4
Unearned finance charges, contract receivable | $ 18.1 | $ 12.1

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- Definition Deferred Discounts, Finance Charges and Interest Included in Contract Receivables, Non-current + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deferred Discounts Finance Charges And Interest Included In Notes And Loans Receivable Non Current + References No definition available. + Details
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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