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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	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	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions / us-gaap_RangeAxis = us-gaap_MinimumMember
Increase in unrecognized tax benefits	0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member]
Income Tax [Line Items]
Decrease in unrecognized tax benefits	0.9us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions / us-gaap_RangeAxis = us-gaap_MaximumMember
Increase in unrecognized tax benefits	0.3us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition

Effective Income Tax Rate Continuing Operations 1

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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

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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)

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