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Receivables - Schedule of Finance and Contract Receivables on Nonaccrual Status (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Receivables [Abstract] |  |
Finance receivables | $ 12.7 | $ 11.7
Contract receivables | $ 1.5 | $ 1.5

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- Definition Contract receivable recorded investment nonaccrual status. + References No definition available. + Details
Name: | sna_ContractReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notes and loans receivable recorded investment non-accrual status. + References No definition available. + Details
Name: | sna_NotesAndLoansReceivableRecordedInvestmentNonAccrualStatus
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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