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Receivables - Components of Current Finance and Contract Receivables (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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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

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration