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Segments (Net Sales By Segment) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 29, 2012		Dec. 31, 2011		Jan. 01, 2011
Segment Reporting Information [Line Items]
Segment net sales									$ 3,315.0		$ 3,199.8		$ 2,935.3
Intersegment eliminations									(377.1)		(345.6)		(316.1)
Total net sales	753.2	711.6	737.9	735.2	736.6	697.2	726.7	693.7	2,937.9		2,854.2		2,619.2
Financial services revenue	42.9	40.5	39.9	38.0	35.5	32.7	30.3	25.8	161.3		124.3		62.3
Total revenues									3,099.2	[1]	2,978.5	[1]	2,681.5	[1]
Segment operating earnings									616.1		557.5		409.7
Corporate									(99.7)		(82.4)		(78.3)
Operating earnings									516.4		475.1		331.4
Interest expense									(55.8)		(61.2)		(54.8)
Other income (expense) - net									(0.4)		(1.0)		0.8
Earnings before income taxes and equity earnings									460.2		412.9		277.4
Commercial & Industrial Group [Member]
Segment Reporting Information [Line Items]
Segment net sales									1,125.9		1,125.8		1,048.2
Segment operating earnings									127.3		123.4		116.9
Snap-On Tools Group [Member]
Segment Reporting Information [Line Items]
Segment net sales									1,272.0		1,153.4		1,039.9
Segment operating earnings									176.4		158.5		114.0
Repair Systems & Information Group [Member]
Segment Reporting Information [Line Items]
Segment net sales									917.1		920.6		847.2
Segment operating earnings									205.7		184.7		164.4
Financial Services [Member]
Segment Reporting Information [Line Items]
Segment operating earnings									$ 106.7		$ 90.9		$ 14.4
[1] Revenues are attributed to countries based on the origin of the sale.

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