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Receivables - Schedule of Performing and Nonperforming Finance and Contract Receivables (Detail) - USD ($) $ in Millions | Sep. 28, 2019 | Dec. 29, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Finance Receivables | $ 1,679.3 | $ 1,654.3
Contract Receivables | 457.3 | 447.5
Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Finance Receivables | 1,651.1 | 1,626.4
Contract Receivables | 454.4 | 441.5
Nonperforming |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Finance Receivables | 28.2 | 27.9
Contract Receivables | $ 2.9 | $ 6.0

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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

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

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