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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 810.7 us-gaap_Goodwill | $ 838.8 us-gaap_Goodwill | $ 807.4 us-gaap_Goodwill
Goodwill purchase accounting related to acquisition | 13.2 us-gaap_GoodwillAcquiredDuringPeriod | 24.8 us-gaap_GoodwillAcquiredDuringPeriod |
Accumulated impairment losses | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  |
Weighted-average amortization period (in years) | 12 years |  |
Aggregate amortization expense | 24.7 us-gaap_AmortizationOfIntangibleAssets | 25.5 us-gaap_AmortizationOfIntangibleAssets | 26.5 us-gaap_AmortizationOfIntangibleAssets
Estimated annual amortization expense for fiscal period 2015 | 24.3 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |
Estimated annual amortization expense for fiscal period 2016 | 19.5 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
Estimated annual amortization expense for fiscal period 2017 | 16.1 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
Estimated annual amortization expense for fiscal period 2018 | 13.4 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
Estimated annual amortization expense for fiscal period 2019 | 12.8 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
Tax Deductible Acquisition Goodwill [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill purchase accounting related to acquisition | 13.2 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = sna_TaxDeductibleAcquisitionGoodwillMember |  |
Non Tax Deductible Acquisition Goodwill [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill purchase accounting related to acquisition | 24.8 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = sna_NonTaxDeductibleAcquisitionGoodwillMember |  |
Customer relationships [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Weighted-average amortization period (in years) | 15 years |  |
Customer relationship contractual term, minimum (in years) | 3 years |  |
Customer relationship contractual term, maximum (in years) | 5 years |  |
Customer relationships [Member] | Pro-Cut International, Inc [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Customer relationship value | 7.4 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = sna_ProCutInternationalIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Customer relationships [Member] | Challenger Lifts Inc [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Customer relationship value | 5.2 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = sna_ChallengerLiftsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 5.2 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = sna_ChallengerLiftsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Trademarks [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Weighted-average amortization period (in years) | 6 years |  |
Trademarks [Member] | Pro-Cut International, Inc [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Non-amortized trademark | 13.8 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = sna_ProCutInternationalIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |
Trademarks [Member] | Challenger Lifts Inc [Member] |  |  |
Acquired Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Non-amortized trademark | $ 3.2 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = sna_ChallengerLiftsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | $ 3.2 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = sna_ChallengerLiftsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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