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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
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	$ 1,109.2sna_NotesAndLoansReceivable	$ 1,085.6sna_NotesAndLoansReceivable
Contract Receivables	318.8sna_ContractReceivable	320.0sna_ContractReceivable
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	1,093.9sna_NotesAndLoansReceivable / us-gaap_InternalCreditAssessmentAxis = sna_PerformingReceivablesMember	1,070.1sna_NotesAndLoansReceivable / us-gaap_InternalCreditAssessmentAxis = sna_PerformingReceivablesMember
Contract Receivables	317.0sna_ContractReceivable / us-gaap_InternalCreditAssessmentAxis = sna_PerformingReceivablesMember	318.5sna_ContractReceivable / us-gaap_InternalCreditAssessmentAxis = sna_PerformingReceivablesMember
Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	15.3sna_NotesAndLoansReceivable / us-gaap_InternalCreditAssessmentAxis = sna_NonperformingReceivablesMember	15.5sna_NotesAndLoansReceivable / us-gaap_InternalCreditAssessmentAxis = sna_NonperformingReceivablesMember
Contract Receivables	$ 1.8sna_ContractReceivable / us-gaap_InternalCreditAssessmentAxis = sna_NonperformingReceivablesMember	$ 1.5sna_ContractReceivable / us-gaap_InternalCreditAssessmentAxis = sna_NonperformingReceivablesMember

X

- Definition

Contract receivable.

+ References

No definition available.

+ Details

Name:	sna_ContractReceivable
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

X

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

X

- Details

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