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Exit and Disposal Activities - Recorded Costs Associated with Exit and Disposal Activities (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs | $ 6.5 us-gaap_RestructuringAndRelatedCostIncurredCost | $ 6.4 us-gaap_RestructuringAndRelatedCostIncurredCost
Commercial & Industrial Group [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs | 1.4 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember | 2.9 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember
Snap-on Tools Group [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs |  | 0.5 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = sna_ToolsGroupMember
Repair Systems & Information Group [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs | 5.1 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember | 2.9 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember
Financial Services [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs |  | 0.1 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_StatementBusinessSegmentsAxis = sna_FinancialServicesMember
Cost of Goods Sold [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs | 5.7 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = sna_CostOfGoodsSoldMember | 4.4 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = sna_CostOfGoodsSoldMember
Cost of Goods Sold [Member] | Commercial & Industrial Group [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs | 1.0 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = sna_CostOfGoodsSoldMember / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember | 2.5 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = sna_CostOfGoodsSoldMember / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember
Cost of Goods Sold [Member] | Snap-on Tools Group [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs |  | 0.2 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = sna_CostOfGoodsSoldMember / us-gaap_StatementBusinessSegmentsAxis = sna_ToolsGroupMember
Cost of Goods Sold [Member] | Repair Systems & Information Group [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs | 4.7 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = sna_CostOfGoodsSoldMember / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember | 1.7 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = sna_CostOfGoodsSoldMember / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember
Operating Expenses [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs | 0.8 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 1.9 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember
Operating Expenses [Member] | Commercial & Industrial Group [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs | 0.4 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember | 0.4 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_StatementBusinessSegmentsAxis = sna_CommercialAndIndustrialGroupMember
Operating Expenses [Member] | Snap-on Tools Group [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs |  | 0.3 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_StatementBusinessSegmentsAxis = sna_ToolsGroupMember
Operating Expenses [Member] | Repair Systems & Information Group [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs | 0.4 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember | 1.2 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_StatementBusinessSegmentsAxis = sna_RepairSystemsAndInformationGroupMember
Operating Expenses [Member] | Financial Services [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Exit and disposal costs |  | $ 0.1 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_StatementBusinessSegmentsAxis = sna_FinancialServicesMember

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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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