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Receivables (Aging Of Finance And Contract Receivable) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 29, 2012 | Dec. 31, 2011
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Finance Receivable Transferred To Held For Sale [Line Items] |  |
Finance receivables, 30-59 Days Past Due | $ 9.2 | $ 8.0
Finance receivables, 60-90 Days Past Due | 5.5 | 3.0
Finance receivables, Greater Than 90 Days Past Due | 8.4 | 6.6
Finance receivables, Total Past Due | 23.1 | 17.6
Finance receivables, Total Not Past Due | 821.1 | 715.6
Finance receivables, Total | 844.2 | 733.2
Finance receivables, Greater Than 90 Days Past Due and Accruing | 6.2 | 4.8
Contract receivables, 30-59 Days Past Due | 1.3 | 0.9
Contract receivables, 60-90 Days Past Due | 0.6 | 0.4
Contract receivables, Greater Than 90 Days Past Due | 1.0 | 0.6
Contract receivables, Total Past Due | 2.9 | 1.9
Contract receivables, Total Not Past Due | 257.4 | 217.0
Contract receivables, Total | 260.3 | 218.9
Contract receivables, Greater Than 90 Days Past Due and Accruing | $ 0.3 | $ 0.2

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- Definition Contract Receivable Recorded Investment Greater Than 90 Days Past Due + References No definition available. + Details
Name: | sna_ContractReceivableRecordedInvestmentGreaterThanNinetyDaysPastDue
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract Receivable Recorded Investment 90 Days Past Due And Still Accruing + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Contract Receivable Recorded Investment Sixty To Ninety Days Past Due + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Contract Receivable Recorded Investment Thirty To Fifty Nine Days Past Due + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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

X
- Definition Contract Receivable Total Not Past Due + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | sna_FinanceReceivableTransferredToHeldForSaleLineItems
Namespace Prefix: | sna_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Notes And Loans Receivable Recorded Investment Greater Than Ninety Days Past Due + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Notes And Loans Receivable Recorded Investment Ninety Days Past Due And Still Accruing + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Notes And Loans Receivable Recorded Investment Sixty To Ninety Days Past Due + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Notes And Loans Receivable Recorded Investment Thirty To Fifty Nine Days Past Due + References No definition available. + Details
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- Definition Notes And Loans Receivable Total + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notes And Loans Receivable Total Not Past Due + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant