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Short-term and Long-term Debt - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 28, 2013
Jan. 03, 2015
Schedule Of Debt Instruments [Line Items]    
Notes payable and current maturities of long-term debt $ 113,100,000us-gaap_NotesPayableCurrent $ 56,600,000us-gaap_NotesPayableCurrent
Commercial paper borrowings 0us-gaap_CommercialPaper 37,000,000us-gaap_CommercialPaper
Other notes payable 13,100,000us-gaap_OtherNotesPayable 19,600,000us-gaap_OtherNotesPayable
Long-term debt and notes payable maturity, 2015   56,600,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Long-term debt and notes payable maturity, 2016   0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Long-term debt and notes payable maturity, 2017   150,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Long-term debt and notes payable maturity, 2018   250,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Long-term debt and notes payable maturity, 2019   200,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Average notes payable outstanding 13,400,000us-gaap_DebtInstrumentCarryingAmount 45,400,000us-gaap_DebtInstrumentCarryingAmount
Weighted-average interest rate on notes payable 10.85%us-gaap_DebtWeightedAverageInterestRate 5.42%us-gaap_DebtWeightedAverageInterestRate
Weighted-average interest rate on outstanding notes payable 12.73%us-gaap_ShortTermDebtWeightedAverageInterestRate 4.86%us-gaap_ShortTermDebtWeightedAverageInterestRate
5.85% Unsecured Notes Due March 2014 [Member]    
Schedule Of Debt Instruments [Line Items]    
Unsecured notes 100,000,000us-gaap_UnsecuredLongTermDebt
/ us-gaap_DebtInstrumentAxis
= sna_FivePointEightFivePercentageUnsecuredNotesDueMarchTwoThousandFourteenMember		  
Unsecured notes, maturity date Mar. 01, 2014  
Unsecured notes, interest rate 5.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sna_FivePointEightFivePercentageUnsecuredNotesDueMarchTwoThousandFourteenMember		  
Five-year Multi-Currency Revolving Credit Facility [Member]    
Schedule Of Debt Instruments [Line Items]    
Revolving credit facility, amount available   700,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= sna_FiveYearMultiCurrencyRevolvingCreditFacilityMember
Revolving credit facility, outstanding amount   $ 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= sna_FiveYearMultiCurrencyRevolvingCreditFacilityMember
Debt maturity term   Five-year
Revolving credit facility, termination date   Sep. 27, 2018
Debt instrument, restrictive covenants   (i) a ratio not greater than 0.60 to 1.00 of consolidated net debt (consolidated debt net of certain cash adjustments) to the sum of such consolidated net debt plus total equity and less accumulated other comprehensive income or loss; or (ii) a ratio not greater than 3.50 to 1.00 of such consolidated net debt to earnings before interest, taxes, depreciation, amortization and certain other adjustments for the preceding four fiscal quarters then ended. As of 2014 year end, the company’s actual ratios of 0.27 and 1.15, respectively, were both within the permitted ranges set forth in this financial covenant.
Actual debt-to-capital ratio   0.27sna_ActualDebtToCapitalRatio
/ us-gaap_DebtInstrumentAxis
= sna_FiveYearMultiCurrencyRevolvingCreditFacilityMember
Actual debt-to-income ratio   1.15sna_ActualDebtToIncomeRatio
/ us-gaap_DebtInstrumentAxis
= sna_FiveYearMultiCurrencyRevolvingCreditFacilityMember
Five-year Multi-Currency Revolving Credit Facility [Member] | Maximum [Member]    
Schedule Of Debt Instruments [Line Items]    
Maximum limit of required debt-to-capital ratio   0.60sna_RequiredDebtToCapitalRatio
/ us-gaap_DebtInstrumentAxis
= sna_FiveYearMultiCurrencyRevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum limit of required debt-to-income ratio   3.50sna_RequiredDebtToIncomeRatio
/ us-gaap_DebtInstrumentAxis
= sna_FiveYearMultiCurrencyRevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember