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v2.4.1.9

Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Apr. 04, 2015 | Mar. 29, 2014
Income Tax [Line Items] |  |
Effective income tax rate | 32.00%sna_EffectiveIncomeTaxRateContinuingOperations1 | 31.60%sna_EffectiveIncomeTaxRateContinuingOperations1
Minimum [Member] |  |
Income Tax [Line Items] |  |
Decrease in unrecognized tax benefits | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions / us-gaap_RangeAxis = us-gaap_MinimumMember |
Increase in unrecognized tax benefits | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] |  |
Income Tax [Line Items] |  |
Decrease in unrecognized tax benefits | 0.9 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions / us-gaap_RangeAxis = us-gaap_MaximumMember |
Increase in unrecognized tax benefits | 0.3 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- Definition Effective Income Tax Rate Continuing Operations 1 + References No definition available. + Details
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- Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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