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Segments - Capital Expenditures, Depreciation and Amortization (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Segment Reporting Information [Line Items]
Capital expenditures	$ 80.6us-gaap_PaymentsForCapitalImprovements	$ 70.6us-gaap_PaymentsForCapitalImprovements	$ 79.4us-gaap_PaymentsForCapitalImprovements
Depreciation and amortization	79.5	76.7	76.7
Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital expenditures	76.4	65.4	72.3
Depreciation and amortization	76.8	74.4	74.8
Operating Segments [Member] \| Commercial & Industrial Group [Member]
Segment Reporting Information [Line Items]
Capital expenditures	28.5	25.3	31.0
Depreciation and amortization	20.8	20.3	21.2
Operating Segments [Member] \| Snap-on Tools Group [Member]
Segment Reporting Information [Line Items]
Capital expenditures	36.9	26.6	29.9
Depreciation and amortization	21.4	19.5	17.9
Operating Segments [Member] \| Repair Systems & Information Group [Member]
Segment Reporting Information [Line Items]
Capital expenditures	10.6	13.0	9.8
Depreciation and amortization	33.7	33.8	35.1
Operating Segments [Member] \| Financial Services [Member]
Segment Reporting Information [Line Items]
Capital expenditures	0.4	0.5	1.6
Depreciation and amortization	0.9	0.8	0.6
Corporate [Member]
Segment Reporting Information [Line Items]
Capital expenditures	4.2	5.2	7.1
Depreciation and amortization	$ 2.7	$ 2.3	$ 1.9