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Receivables - Components of Current Finance and Contract Receivables (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013
Receivables [Abstract]
Unearned finance charges, finance receivables	$ 15.6sna_DeferredDiscountsFinanceChargesAndInterestIncludedInNotesAndLoansReceivableCurrent	$ 14.1sna_DeferredDiscountsFinanceChargesAndInterestIncludedInNotesAndLoansReceivableCurrent
Unearned finance charges, contract receivable	$ 13.9sna_DeferredDiscountsFinanceChargesAndInterestIncludedInContractReceivablesCurrent	$ 13.0sna_DeferredDiscountsFinanceChargesAndInterestIncludedInContractReceivablesCurrent

X

- Definition

Deferred discounts finance charges and interest included in contract receivables current.

+ References

No definition available.

+ Details

Name:	sna_DeferredDiscountsFinanceChargesAndInterestIncludedInContractReceivablesCurrent
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Deferred discounts finance charges and interest included in notes and loans receivable current.

+ References

No definition available.

+ Details

Name:	sna_DeferredDiscountsFinanceChargesAndInterestIncludedInNotesAndLoansReceivableCurrent
Namespace Prefix:	sna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration