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Segments - Products and Services (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Revenue from External Customer [Line Items]
Net sales	$ 857.4us-gaap_SalesRevenueNet	$ 806.3us-gaap_SalesRevenueNet	$ 826.5us-gaap_SalesRevenueNet	$ 787.5us-gaap_SalesRevenueNet	$ 797.5us-gaap_SalesRevenueNet	$ 753.2us-gaap_SalesRevenueNet	$ 764.1us-gaap_SalesRevenueNet	$ 741.7us-gaap_SalesRevenueNet	$ 3,277.7us-gaap_SalesRevenueNet	$ 3,056.5us-gaap_SalesRevenueNet	$ 2,937.9us-gaap_SalesRevenueNet
Financial services revenue	59.4us-gaap_FinancialServicesRevenue	53.6us-gaap_FinancialServicesRevenue	51.7us-gaap_FinancialServicesRevenue	50.2us-gaap_FinancialServicesRevenue	47.4us-gaap_FinancialServicesRevenue	45.1us-gaap_FinancialServicesRevenue	44.5us-gaap_FinancialServicesRevenue	44.0us-gaap_FinancialServicesRevenue	214.9us-gaap_FinancialServicesRevenue	181.0us-gaap_FinancialServicesRevenue	161.3us-gaap_FinancialServicesRevenue
Total revenue									3,492.6us-gaap_Revenues	3,237.5us-gaap_Revenues	3,099.2us-gaap_Revenues
Tools [Member]
Revenue from External Customer [Line Items]
Net sales									1,868.5us-gaap_SalesRevenueNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = sna_ToolsMember	1,743.3us-gaap_SalesRevenueNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = sna_ToolsMember	1,729.4us-gaap_SalesRevenueNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = sna_ToolsMember
Diagnostics and Repair Information [Member]
Revenue from External Customer [Line Items]
Net sales									689.5us-gaap_SalesRevenueNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = sna_DiagnosticsAndRepairInformationMember	652.0us-gaap_SalesRevenueNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = sna_DiagnosticsAndRepairInformationMember	619.8us-gaap_SalesRevenueNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = sna_DiagnosticsAndRepairInformationMember
Equipment [Member]
Revenue from External Customer [Line Items]
Net sales									$ 719.7us-gaap_SalesRevenueNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember	$ 661.2us-gaap_SalesRevenueNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember	$ 588.7us-gaap_SalesRevenueNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember

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The aggregate financial services revenue and operating interest income earned during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section S99

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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