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Short-term and Long-term Debt - Additional Information (Detail) (USD $)
3 Months Ended
Apr. 04, 2015
Jan. 03, 2015
Schedule Of Debt Instruments [Line Items]    
Notes payable and current maturities of long-term debt $ 78,800,000us-gaap_NotesPayableCurrent $ 56,600,000us-gaap_NotesPayableCurrent
Commercial paper borrowings 52,500,000us-gaap_CommercialPaper 37,000,000us-gaap_CommercialPaper
Other notes payable 26,300,000us-gaap_OtherNotesPayable 19,600,000us-gaap_OtherNotesPayable
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.  
Actual debt-to-capital ratio 0.27sna_ActualDebtToCapitalRatio
/ us-gaap_DebtInstrumentAxis
= sna_FiveYearMultiCurrencyRevolvingCreditFacilityMember
 
Actual debt-to-income ratio 1.14sna_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