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Segments - Net Sales by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 980.1	$ 982.8	$ 3,035.2	$ 2,945.8
Operating earnings	232.4	208.7	717.9	669.7	$ 882.1	$ 861.1
Interest expense	(12.4)	(13.1)	(38.0)	(38.8)	(52.4)	(52.2)
Other income (expense) – net	(1.0)	(1.7)	1.2	(6.0)	(7.8)	(7.5)
Earnings before income taxes and equity earnings	219.0	193.9	681.1	624.9	821.9	801.4
Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	330.2		999.6
Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	389.8		1,206.4
Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	314.4		994.5
Financial Services
Segment Reporting Information [Line Items]
Net sales	82.0		247.0
Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,034.4	1,040.8	3,200.5	3,129.6
Operating earnings	252.3	246.5	784.9	750.8
Operating Segments | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	330.2	314.6	999.6	923.3
Operating earnings	53.0	50.3	148.5	135.2
Operating Segments | Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	389.8	392.7	1,206.4	1,215.9
Operating earnings	59.3	56.4	207.2	207.4
Operating Segments | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	314.4	333.5	994.5	990.4
Operating earnings	80.7	83.8	255.2	245.1
Operating Segments | Financial Services
Segment Reporting Information [Line Items]
Operating earnings	59.3	56.0	174.0	163.1
Intersegment eliminations
Segment Reporting Information [Line Items]
Net sales	(136.3)	(137.0)	(412.3)	(417.3)
Corporate
Segment Reporting Information [Line Items]
Operating earnings	(19.9)	(37.8)	(67.0)	(81.1)
Product And Services, Excluding Financial Services
Segment Reporting Information [Line Items]
Net sales	898.1	903.8	2,788.2	2,712.3	3,686.9	3,430.4
Operating earnings	173.1	152.7	543.9	506.6	$ 664.6	$ 662.4
Product And Services, Excluding Financial Services | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	255.7		781.6
Product And Services, Excluding Financial Services | Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	389.8		1,206.4
Product And Services, Excluding Financial Services | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	252.6		800.2
Product And Services, Excluding Financial Services | Financial Services
Segment Reporting Information [Line Items]
Net sales	0.0		0.0
Product And Services, Excluding Financial Services | Operating Segments
Segment Reporting Information [Line Items]
Net sales	898.1		2,788.2
Product And Services, Excluding Financial Services | Operating Segments | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	330.2		999.6
Product And Services, Excluding Financial Services | Operating Segments | Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	389.8		1,206.4
Product And Services, Excluding Financial Services | Operating Segments | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	314.4		994.5
Product And Services, Excluding Financial Services | Operating Segments | Financial Services
Segment Reporting Information [Line Items]
Net sales	0.0		0.0
Product And Services, Excluding Financial Services | Intersegment eliminations
Segment Reporting Information [Line Items]
Net sales	(136.3)		(412.3)
Product And Services, Excluding Financial Services | Intersegment eliminations | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	74.5		218.0
Product And Services, Excluding Financial Services | Intersegment eliminations | Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	0.0		0.0
Product And Services, Excluding Financial Services | Intersegment eliminations | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	61.8		194.3
Product And Services, Excluding Financial Services | Intersegment eliminations | Financial Services
Segment Reporting Information [Line Items]
Net sales	0.0		0.0
Financial Service
Segment Reporting Information [Line Items]
Net sales	82.0	79.0	247.0	233.5
Operating earnings	59.3	$ 56.0	174.0	$ 163.1
Financial Service | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Net sales	0.0		0.0
Financial Service | Snap-on Tools Group
Segment Reporting Information [Line Items]
Net sales	0.0		0.0
Financial Service | Repair Systems & Information Group
Segment Reporting Information [Line Items]
Net sales	0.0		0.0
Financial Service | Financial Services
Segment Reporting Information [Line Items]
Net sales	82.0		247.0
Financial Service | Intersegment eliminations
Segment Reporting Information [Line Items]
Net sales	$ 0.0		$ 0.0

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