Consolidated Statements of Earnings (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Income Statement [Abstract]
Net sales	$ 3,277.7us-gaap_SalesRevenueNet	$ 3,056.5us-gaap_SalesRevenueNet	$ 2,937.9us-gaap_SalesRevenueNet
Cost of goods sold	(1,693.4)us-gaap_CostOfGoodsAndServicesSold	(1,583.6)us-gaap_CostOfGoodsAndServicesSold	(1,547.9)us-gaap_CostOfGoodsAndServicesSold
Gross profit	1,584.3us-gaap_GrossProfit	1,472.9us-gaap_GrossProfit	1,390.0us-gaap_GrossProfit
Operating expenses	(1,048.7)us-gaap_OperatingExpenses	(1,012.4)us-gaap_OperatingExpenses	(980.3)us-gaap_OperatingExpenses
Operating earnings before financial services	535.6	460.5	409.7
Financial services revenue	214.9us-gaap_FinancialServicesRevenue	181.0us-gaap_FinancialServicesRevenue	161.3us-gaap_FinancialServicesRevenue
Financial services expenses	(65.8)us-gaap_FinancialServicesCosts	(55.3)us-gaap_FinancialServicesCosts	(54.6)us-gaap_FinancialServicesCosts
Operating earnings from financial services	149.1sna_OperatingEarningsFromSegment	125.7sna_OperatingEarningsFromSegment	106.7sna_OperatingEarningsFromSegment
Operating earnings	684.7us-gaap_OperatingIncomeLoss	586.2us-gaap_OperatingIncomeLoss	516.4us-gaap_OperatingIncomeLoss
Interest expense	(52.9)us-gaap_InterestExpense	(56.1)us-gaap_InterestExpense	(55.8)us-gaap_InterestExpense
Other income (expense) - net	(0.9)us-gaap_OtherNonoperatingIncomeExpense	(3.9)us-gaap_OtherNonoperatingIncomeExpense	(0.4)us-gaap_OtherNonoperatingIncomeExpense
Earnings before income taxes and equity earnings	630.9	526.2	460.2
Income tax expense	(199.5)us-gaap_IncomeTaxExpenseBenefit	(166.7)us-gaap_IncomeTaxExpenseBenefit	(148.2)us-gaap_IncomeTaxExpenseBenefit
Earnings before equity earnings	431.4sna_EarningsBeforeEquityEarnings	359.5sna_EarningsBeforeEquityEarnings	312.0sna_EarningsBeforeEquityEarnings
Equity earnings, net of tax	0.7	0.2	2.6
Net earnings	432.1us-gaap_ProfitLoss	359.7us-gaap_ProfitLoss	314.6us-gaap_ProfitLoss
Net earnings attributable to noncontrolling interests	(10.2)	(9.4)	(8.5)
Net earnings attributable to Snap-on Incorporated	$ 421.9us-gaap_NetIncomeLoss	$ 350.3us-gaap_NetIncomeLoss	$ 306.1us-gaap_NetIncomeLoss
Net earnings per share attributable to Snap-on Incorporated:
Basic	$ 7.26us-gaap_EarningsPerShareBasic	$ 6.02us-gaap_EarningsPerShareBasic	$ 5.26us-gaap_EarningsPerShareBasic
Diluted	$ 7.14us-gaap_EarningsPerShareDiluted	$ 5.93us-gaap_EarningsPerShareDiluted	$ 5.20us-gaap_EarningsPerShareDiluted
Weighted-average shares outstanding:
Basic	58.1	58.2	58.2
Effect of dilutive securities	1.0	0.9	0.7
Diluted	59.1	59.1	58.9

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