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Receivables - Components of Current Finance and Contract Receivables (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Receivables [Abstract]
Unearned finance charges, finance receivables	$ 20.7	$ 17.0
Unearned finance charges, contract receivable	$ 17.0	$ 15.6

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- 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

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- 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

- References

No definition available.

+ Details

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