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Segments - Capital Expenditures, Depreciation and Amortization (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Segment Reporting Information [Line Items]
Capital expenditures	$ 82.0	$ 74.3	$ 80.4
Depreciation and amortization	93.2	85.6	82.5
Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital expenditures	77.3	71.3	79.1
Depreciation and amortization	90.3	82.8	79.7
Operating Segments [Member] | Commercial & Industrial Group [Member]
Segment Reporting Information [Line Items]
Capital expenditures	22.6	19.3	31.0
Depreciation and amortization	22.8	20.7	20.1
Operating Segments [Member] | Snap-on Tools Group [Member]
Segment Reporting Information [Line Items]
Capital expenditures	40.1	38.3	38.1
Depreciation and amortization	29.1	27.6	24.9
Operating Segments [Member] | Repair Systems & Information Group [Member]
Segment Reporting Information [Line Items]
Capital expenditures	13.4	13.1	9.0
Depreciation and amortization	37.8	33.9	34.0
Operating Segments [Member] | Financial Services [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1.2	0.6	1.0
Depreciation and amortization	0.6	0.6	0.7
Corporate [Member]
Segment Reporting Information [Line Items]
Capital expenditures	4.7	3.0	1.3
Depreciation and amortization	$ 2.9	$ 2.8	$ 2.8

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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- Definition

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