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Receivables - Components of Finance and Contract Receivables Beyond One Year (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Apr. 04, 2015 | Jan. 03, 2015
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Receivables [Abstract] |  |
Unearned finance charges, finance receivables | $ 9.7 sna_DeferredDiscountsFinanceChargesAndInterestIncludedInNotesAndLoansReceivableNonCurrent | $ 9.9 sna_DeferredDiscountsFinanceChargesAndInterestIncludedInNotesAndLoansReceivableNonCurrent
Unearned finance charges, contract receivable | $ 19.7 sna_DeferredDiscountsFinanceChargesAndInterestIncludedInContractReceivablesNonCurrent | $ 19.4 sna_DeferredDiscountsFinanceChargesAndInterestIncludedInContractReceivablesNonCurrent

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- Definition Deferred discounts, finance charges and interest included in contract receivables, non-current. + References No definition available. + Details
Name: | sna_DeferredDiscountsFinanceChargesAndInterestIncludedInContractReceivablesNonCurrent
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 non current. + References No definition available. + Details
Name: | sna_DeferredDiscountsFinanceChargesAndInterestIncludedInNotesAndLoansReceivableNonCurrent
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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