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Exit and Disposal Activities - Recorded Costs for Exit and Disposal Activities (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 29, 2014
Restructuring Cost and Reserve [Line Items]  
Exit and disposal costs $ 2.0us-gaap_RestructuringAndRelatedCostIncurredCost
Cost of Goods Sold [Member] | Repair Systems & Information Group [Member]  
Restructuring Cost and Reserve [Line Items]  
Exit and disposal costs $ 2.0us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_IncomeStatementLocationAxis
= sna_CostOfGoodsSoldMember
/ us-gaap_StatementBusinessSegmentsAxis
= sna_RepairSystemsAndInformationGroupMember