Receivables - Components of Finance and Contract Receivables Beyond One Year (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 30, 2017	Dec. 31, 2016
Receivables [Abstract]
Unearned finance charges, finance receivables	$ 16.7	$ 13.0
Unearned finance charges, contract receivable	$ 25.5	$ 21.5

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

No definition available.

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