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Receivables - Rollforward of Allowances for Doubtful Accounts for Finance and Contract Receivables (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jul. 01, 2017 | Jul. 02, 2016 | Jul. 01, 2017 | Jul. 02, 2016
Receivables [Abstract] |  |  |  |
Finance receivables, Allowance for doubtful accounts, Beginning of year | $ 50.5 | $ 39.9 | $ 48.6 | $ 38.2
Finance receivables, Provision | 12.8 | 10.3 | 25.8 | 19.6
Finance receivables, Charge-offs | (12.5) | (9.2) | (25.4) | (18.8)
Finance receivables, Recoveries | 1.7 | 1.7 | 3.4 | 3.6
Finance receivables, Currency Translation |  | (0.1) | 0.1 |
Finance receivables, Allowance for doubtful accounts, End of period | 52.5 | 42.6 | 52.5 | 42.6
Contract receivables, Allowance for doubtful accounts, Beginning of year | 4.7 | 4.6 | 3.9 | 4.4
Contract receivables, Provision | 0.6 | 0.2 | 1.9 | 0.6
Contract receivables, Charge-offs | (0.6) | (0.3) | (1.2) | (0.7)
Contract receivables, Recoveries |  | 0.1 | 0.1 | 0.2
Contract receivables, Currency Translation | 0.1 | (0.1) | 0.1 |
Contract receivables, Allowance for doubtful accounts, End of period | $ 4.8 | $ 4.5 | $ 4.8 | $ 4.5

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- Definition Contract receivable allowance for credit losses. + References No definition available. + Details
Name: | sna_ContractReceivableAllowanceForCreditLosses
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract receivable, charge-offs. + References No definition available. + Details
Name: | sna_ContractReceivableChargeOffs
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Contract receivables foreign currency translation adjustments. + References No definition available. + Details
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Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Contract receivables provision for bad debt expense. + References No definition available. + Details
Name: | sna_ContractReceivablesProvisionForBadDebtExpense
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract receivables, recoveries. + References No definition available. + Details
Name: | sna_ContractReceivablesRecoveries
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Notes and loans receivable allowance for credit losses. + References No definition available. + Details
Name: | sna_NotesAndLoansReceivableAllowanceForCreditLosses
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Notes and loans receivable allowance for credit losses currency translation adjustment. + References No definition available. + Details
Name: | sna_NotesAndLoansReceivableAllowanceForCreditLossesCurrencyTranslationAdjustment
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Notes and loans receivable allowance for credit losses recoveries. + References No definition available. + Details
Name: | sna_NotesAndLoansReceivableAllowanceForCreditLossesRecoveries
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Notes and loans receivable allowance for credit losses write offs. + References No definition available. + Details
Name: | sna_NotesAndLoansReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | sna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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