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Financial Instruments - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Investment Holdings [Line Items] |  |  |
Long-term debt related to interest rate swaps | $ 14.0 sna_DebtInstrumentInterestRateSwapAdjustment | $ 10.1 sna_DebtInstrumentInterestRateSwapAdjustment |
Foreign exchange loss | 1.5 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | 4.4 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | 0.7 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Maximum maturity date of fair value hedge (in years) | 7 years |  |
Derivative gain expected to reclassify from Accumulated OCI into earnings, in the next 12 months, net of tax | 0.2 us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months |  |
Fair Value Hedging [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Notional amount of interest rate swaps outstanding and designated as fair value hedges | 100.0 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember | 100.0 us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember |
Equity forwards [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Equity forwards in place of common stock associated with its deferred compensation plans | 112,800 us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember | 105,800 us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember |
Not Designated as Hedging Instrument [Member] | Other Income (Expense) - Net [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Transaction gains (losses) on net exposures | 17.8 us-gaap_ForeignCurrencyTransactionGainLossRealized / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | (6.3)us-gaap_ForeignCurrencyTransactionGainLossRealized / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | (11.7)us-gaap_ForeignCurrencyTransactionGainLossRealized / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember
Foreign exchange loss | 1.5 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | 4.4 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember | 0.7 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember
Not Designated as Hedging Instrument [Member] | Equity forwards [Member] | Operating Expenses [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Derivative gain (losses) recognized | 3.6 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember | 3.3 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember |
Mark-to-market deferred compensation expense | 3.6 us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember | 3.7 us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember |
Not Designated as Hedging Instrument [Member] | Foreign currency forwards [Member] | Other Income (Expense) - Net [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Derivative gain (losses) recognized | (19.3)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember | 1.9 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember | 11.0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember
Foreign Currency Forward Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 140.4 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractsMember | 197.1 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractsMember |
Euros [Member] | Buy Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 81.5 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractEurosMember / us-gaap_PositionAxis = sna_BuyContractsMember | 89.1 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractEurosMember / us-gaap_PositionAxis = sna_BuyContractsMember |
Swedish Kronor [Member] | Buy Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 22.1 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractSwedishKronorMember / us-gaap_PositionAxis = sna_BuyContractsMember | 64.3 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractSwedishKronorMember / us-gaap_PositionAxis = sna_BuyContractsMember |
Australian Dollars [Member] | Buy Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 34.8 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractAustralianDollarsMember / us-gaap_PositionAxis = sna_BuyContractsMember | 33.8 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractAustralianDollarsMember / us-gaap_PositionAxis = sna_BuyContractsMember |
South Korean Won [Member] | Buy Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 5.7 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractSouthKoreanWonMember / us-gaap_PositionAxis = sna_BuyContractsMember | 5.5 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractSouthKoreanWonMember / us-gaap_PositionAxis = sna_BuyContractsMember |
Singapore Dollars [Member] | Buy Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 10.1 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractSingaporeDollarsMember / us-gaap_PositionAxis = sna_BuyContractsMember | 12.7 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractSingaporeDollarsMember / us-gaap_PositionAxis = sna_BuyContractsMember |
British Pounds [Member] | Buy Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 16.3 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractBritishPoundsMember / us-gaap_PositionAxis = sna_BuyContractsMember | 26.2 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractBritishPoundsMember / us-gaap_PositionAxis = sna_BuyContractsMember |
Mexican Pesos [Member] | Buy Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 4.5 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractMexicanPesosMember / us-gaap_PositionAxis = sna_BuyContractsMember | 4.7 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractMexicanPesosMember / us-gaap_PositionAxis = sna_BuyContractsMember |
Hong Kong Dollars [Member] | Buy Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 3.6 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractHongKongDollarsMember / us-gaap_PositionAxis = sna_BuyContractsMember | 7.8 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractHongKongDollarsMember / us-gaap_PositionAxis = sna_BuyContractsMember |
Other Currencies [Member] | Buy Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 0.5 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractOtherCurrenciesMember / us-gaap_PositionAxis = sna_BuyContractsMember |  |
Other Currencies [Member] | Sell Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 7.7 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractOtherCurrenciesMember / us-gaap_PositionAxis = sna_SellContractsMember | 4.4 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractOtherCurrenciesMember / us-gaap_PositionAxis = sna_SellContractsMember |
Japanese Yen [Member] | Sell Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 10.9 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractJapaneseYenMember / us-gaap_PositionAxis = sna_SellContractsMember | 12.2 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractJapaneseYenMember / us-gaap_PositionAxis = sna_SellContractsMember |
Canadian Dollars [Member] | Sell Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 16.8 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractCanadianDollarsMember / us-gaap_PositionAxis = sna_SellContractsMember | 25.6 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractCanadianDollarsMember / us-gaap_PositionAxis = sna_SellContractsMember |
Danish Kroner [Member] | Sell Contracts [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Foreign currency forwards outstanding | 3.3 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractDanishKronerMember / us-gaap_PositionAxis = sna_SellContractsMember | 4.8 us-gaap_InvestmentOwnedForeignCurrencyContractReportingCurrencyAmountCurrentValue / us-gaap_DerivativeInstrumentRiskAxis = sna_ForeignCurrencyForwardContractDanishKronerMember / us-gaap_PositionAxis = sna_SellContractsMember |
Treasury Locks [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Treasury locks settled | 0 sna_TreasuryLocksSettled / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TreasuryLockMember | 0 sna_TreasuryLocksSettled / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TreasuryLockMember |
Treasury locks outstanding | $ 0 sna_TreasuryLocksOutstanding / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TreasuryLockMember | $ 0 sna_TreasuryLocksOutstanding / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TreasuryLockMember |

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- Definition Treasury locks outstanding. + References No definition available. + Details
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- Definition Amount of expense recognized from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments), awarded to key employees or individuals. Excludes amount related to plans that cover generally all employees (for example, but not limited to, qualified pension plans). + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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