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Segments - Net Sales by Segment (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Segment Reporting Information [Line Items]
Net sales	$ 851.7	$ 821.5	$ 851.8	$ 827.8	$ 857.4	$ 806.3	$ 826.5	$ 787.5	$ 3,352.8	$ 3,277.7	$ 3,056.5
Financial services revenue	$ 63.1	$ 61.1	$ 58.7	$ 57.4	$ 59.4	$ 53.6	$ 51.7	$ 50.2	240.3	214.9	181.0
Total revenues									3,593.1	3,492.6	3,237.5
Operating earnings									764.8	684.7	586.2
Interest expense									(51.9)	(52.9)	(56.1)
Other income (expense) - net									(2.4)	(0.9)	(3.9)
Earnings before income taxes and equity earnings									710.5	630.9	526.2
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									3,845.5	3,725.2	3,459.0
Operating earnings									869.0	782.0	689.5
Operating Segments [Member] | Commercial & Industrial Group [Member]
Segment Reporting Information [Line Items]
Net sales									1,163.6	1,174.8	1,091.0
Operating earnings									169.4	158.6	137.3
Operating Segments [Member] | Snap-on Tools Group [Member]
Segment Reporting Information [Line Items]
Net sales									1,568.7	1,455.2	1,358.4
Operating earnings									256.0	223.1	194.6
Operating Segments [Member] | Repair Systems & Information Group [Member]
Segment Reporting Information [Line Items]
Net sales									1,113.2	1,095.2	1,009.6
Operating earnings									273.4	251.2	231.9
Operating Segments [Member] | Financial Services [Member]
Segment Reporting Information [Line Items]
Operating earnings									170.2	149.1	125.7
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales									(492.7)	(447.5)	(402.5)
Corporate [Member]
Segment Reporting Information [Line Items]
Operating earnings									$ (104.2)	$ (97.3)	$ (103.3)

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
-Topic 225
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-Section S99
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