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Income Taxes - Operating Loss Carry Forwards (Detail) (USD $) In Millions, unless otherwise specified | Jan. 03, 2015
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Income Taxes [Line Items] |
Total net operating loss carryforwards | $ 305.3 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
State [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 143.1 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
United States [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards |
Foreign [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 162.2 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
2015 - 2019 [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 32.6 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = sna_ExpiringInTwoThousandFifteenToTwoThousandNineteenMember
2015 - 2019 [Member] | State [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards |
2015 - 2019 [Member] | United States [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards |
2015 - 2019 [Member] | Foreign [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 32.6 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = sna_ExpiringInTwoThousandFifteenToTwoThousandNineteenMember
2020 - 2024 [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 14.0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = sna_ExpiringInTwoThousandTwentyToTwoThousandTwentyFourMember
2020 - 2024 [Member] | State [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 0.3 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = sna_ExpiringInTwoThousandTwentyToTwoThousandTwentyFourMember
2020 - 2024 [Member] | United States [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards |
2020 - 2024 [Member] | Foreign [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 13.7 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = sna_ExpiringInTwoThousandTwentyToTwoThousandTwentyFourMember
2025 - 2029 [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 21.1 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = sna_ExpiringInTwoThousandTwentyFiveToTwoThousandTwentyNineMember
2025 - 2029 [Member] | State [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards |
2025 - 2029 [Member] | United States [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards |
2025 - 2029 [Member] | Foreign [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 21.1 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = sna_ExpiringInTwoThousandTwentyFiveToTwoThousandTwentyNineMember
2030 - 2034 [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 157.1 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = sna_ExpiringInTwoThousandThirtyToTwoThousandThirtyFourMember
2030 - 2034 [Member] | State [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 142.8 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = sna_ExpiringInTwoThousandThirtyToTwoThousandThirtyFourMember
2030 - 2034 [Member] | United States [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards |
2030 - 2034 [Member] | Foreign [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 14.3 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = sna_ExpiringInTwoThousandThirtyToTwoThousandThirtyFourMember
Indefinite [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | 80.5 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = sna_IndefiniteMember
Indefinite [Member] | State [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards |
Indefinite [Member] | United States [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards |
Indefinite [Member] | Foreign [Member] |
Income Taxes [Line Items] |
Total net operating loss carryforwards | $ 80.5 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = sna_IndefiniteMember

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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