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Receivables - Schedule of Performing and Nonperforming Finance and Contract Receivables (Detail) (USD $) In Millions, unless otherwise specified | Apr. 04, 2015 | Jan. 03, 2015
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Financing Receivable, Recorded Investment [Line Items] |  |
Finance Receivables | $ 1,109.2 sna_NotesAndLoansReceivable | $ 1,085.6 sna_NotesAndLoansReceivable
Contract Receivables | 318.8 sna_ContractReceivable | 320.0 sna_ContractReceivable
Performing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Finance Receivables | 1,093.9 sna_NotesAndLoansReceivable / us-gaap_InternalCreditAssessmentAxis = sna_PerformingReceivablesMember | 1,070.1 sna_NotesAndLoansReceivable / us-gaap_InternalCreditAssessmentAxis = sna_PerformingReceivablesMember
Contract Receivables | 317.0 sna_ContractReceivable / us-gaap_InternalCreditAssessmentAxis = sna_PerformingReceivablesMember | 318.5 sna_ContractReceivable / us-gaap_InternalCreditAssessmentAxis = sna_PerformingReceivablesMember
Nonperforming [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Finance Receivables | 15.3 sna_NotesAndLoansReceivable / us-gaap_InternalCreditAssessmentAxis = sna_NonperformingReceivablesMember | 15.5 sna_NotesAndLoansReceivable / us-gaap_InternalCreditAssessmentAxis = sna_NonperformingReceivablesMember
Contract Receivables | $ 1.8 sna_ContractReceivable / us-gaap_InternalCreditAssessmentAxis = sna_NonperformingReceivablesMember | $ 1.5 sna_ContractReceivable / us-gaap_InternalCreditAssessmentAxis = sna_NonperformingReceivablesMember

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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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- 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_NonperformingReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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