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Receivables - Schedule of Performing and Nonperforming Finance and Contract Receivables (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Jan. 02, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Finance Receivables | $ 1,455.6 | $ 1,258.2
Contract Receivables | 378.7 | 353.1
Performing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Finance Receivables | 1,430.7 | 1,240.0
Contract Receivables | 376.7 | 351.4
Nonperforming [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Finance Receivables | 24.9 | 18.2
Contract Receivables | $ 2.0 | $ 1.7

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

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- Definition Notes and loans receivable. + References No definition available. + Details
Name: | sna_NotesAndLoansReceivable
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=sna_PerformingReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=sna_NonperformingReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |