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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Goodwill [Line Items]
Beginning Balance	$ 790.1	$ 810.7
Currency translation	(25.9)	(26.8)
Acquisitions	131.3	6.2
Ending Balance	895.5	790.1
Commercial & Industrial Group [Member]
Goodwill [Line Items]
Beginning Balance	253.1	275.9
Currency translation	(16.4)	(22.8)
Acquisitions	5.7
Ending Balance	242.4	253.1
Snap-on Tools Group [Member]
Goodwill [Line Items]
Beginning Balance	12.5	12.5
Ending Balance	12.5	12.5
Repair Systems & Information Group [Member]
Goodwill [Line Items]
Beginning Balance	524.5	522.3
Currency translation	(9.5)	(4.0)
Acquisitions	125.6	6.2
Ending Balance	$ 640.6	$ 524.5

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 350
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e961-128460

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