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Receivables (Schedule of Finance and Contract Receivable on Non Accrual Status) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 29, 2012 | Dec. 31, 2011
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Finance receivables | $ 7.2 | $ 6.8
Contract receivables | $ 0.9 | $ 0.7

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- Definition Contract Receivable Recorded Investment Nonaccrual Status + References No definition available. + Details
Name: | sna_ContractReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notes And Loans Receivable Recorded Investment Non-Accrual Status + References No definition available. + Details
Name: | sna_NotesAndLoansReceivableRecordedInvestmentNonAccrualStatus
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration