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v2.4.1.9

Short-term and Long-term Debt - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 28, 2013 | Jan. 03, 2015
Schedule Of Debt Instruments [Line Items] |  |
Notes payable and current maturities of long-term debt | $ 113,100,000 us-gaap_NotesPayableCurrent | $ 56,600,000 us-gaap_NotesPayableCurrent
Commercial paper borrowings | 0 us-gaap_CommercialPaper | 37,000,000 us-gaap_CommercialPaper
Other notes payable | 13,100,000 us-gaap_OtherNotesPayable | 19,600,000 us-gaap_OtherNotesPayable
Long-term debt and notes payable maturity, 2015 |  | 56,600,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Long-term debt and notes payable maturity, 2016 |  | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Long-term debt and notes payable maturity, 2017 |  | 150,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Long-term debt and notes payable maturity, 2018 |  | 250,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Long-term debt and notes payable maturity, 2019 |  | 200,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Average notes payable outstanding | 13,400,000 us-gaap_DebtInstrumentCarryingAmount | 45,400,000 us-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 | 100,000,000 us-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 |  | 700,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = sna_FiveYearMultiCurrencyRevolvingCreditFacilityMember
Revolving credit facility, outstanding amount |  | $ 0 us-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 |  | 0.27 sna_ActualDebtToCapitalRatio / us-gaap_DebtInstrumentAxis = sna_FiveYearMultiCurrencyRevolvingCreditFacilityMember
Actual debt-to-income ratio |  | 1.15 sna_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 |  | 0.60 sna_RequiredDebtToCapitalRatio / us-gaap_DebtInstrumentAxis = sna_FiveYearMultiCurrencyRevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum limit of required debt-to-income ratio |  | 3.50 sna_RequiredDebtToIncomeRatio / us-gaap_DebtInstrumentAxis = sna_FiveYearMultiCurrencyRevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a(3) -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2 -Article 9 + Details
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