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Segments - Net Sales by Segment (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Segment Reporting Information [Line Items]
Net sales	$ 889.8	$ 834.1	$ 872.3	$ 834.2	$ 851.7	$ 821.5	$ 851.8	$ 827.8	$ 3,430.4	$ 3,352.8	$ 3,277.7
Financial services revenue	$ 74.2	$ 71.6	$ 69.3	$ 66.3	$ 63.1	$ 61.1	$ 58.7	$ 57.4	281.4	240.3	214.9
Total revenues									3,711.8	3,593.1	3,492.6
Operating earnings									854.2	764.8	684.7
Interest expense									(52.2)	(51.9)	(52.9)
Other income (expense) - net									(0.6)	(2.4)	(0.9)
Earnings before income taxes and equity earnings									801.4	710.5	630.9
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									3,962.1	3,845.5	3,725.2
Operating earnings									945.6	869.0	782.0
Operating Segments [Member] | Commercial & Industrial Group [Member]
Segment Reporting Information [Line Items]
Net sales									1,148.3	1,163.6	1,174.8
Operating earnings									168.0	169.4	158.6
Operating Segments [Member] | Snap-on Tools Group [Member]
Segment Reporting Information [Line Items]
Net sales									1,633.9	1,568.7	1,455.2
Operating earnings									281.1	256.0	223.1
Operating Segments [Member] | Repair Systems & Information Group [Member]
Segment Reporting Information [Line Items]
Net sales									1,179.9	1,113.2	1,095.2
Operating earnings									297.8	273.4	251.2
Operating Segments [Member] | Financial Services [Member]
Segment Reporting Information [Line Items]
Operating earnings									198.7	170.2	149.1
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales									(531.7)	(492.7)	(447.5)
Corporate [Member]
Segment Reporting Information [Line Items]
Operating earnings									$ (91.4)	$ (104.2)	$ (97.3)

X

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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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