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Receivables (Schedule Of Performing And Nonperforming Finance And Contract Receivables) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 29, 2012 | Dec. 31, 2011
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Finance Receivables | $ 844.2 | $ 733.2
Contract Receivables | 260.3 | 218.9
Performing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Finance Receivables | 830.8 | 721.7
Contract Receivables | 259.4 | 218.2
Nonperforming [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Finance Receivables | 13.4 | 11.5
Contract Receivables | $ 0.9 | $ 0.7

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- Definition Contract Receivable Total + References No definition available. + Details
Name: | sna_ContractReceivableTotal
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notes And Loans Receivable Total + References No definition available. + Details
Name: | sna_NotesAndLoansReceivableTotal
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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