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Segments - Capital Expenditures, Depreciation and Amortization (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Segment Reporting Information [Line Items]
Capital expenditures	$ 99.4	$ 90.9	$ 82.0
Depreciation and amortization	92.4	94.1	93.2
Operating Segments
Segment Reporting Information [Line Items]
Capital expenditures	96.3	87.7	77.3
Depreciation and amortization	88.9	91.0	90.3
Operating Segments | Commercial & Industrial Group
Segment Reporting Information [Line Items]
Capital expenditures	30.1	21.5	22.6
Depreciation and amortization	23.5	23.6	22.8
Operating Segments | Snap-on Tools Group
Segment Reporting Information [Line Items]
Capital expenditures	42.7	46.0	40.1
Depreciation and amortization	31.7	29.9	29.1
Operating Segments | Repair Systems  & Information Group
Segment Reporting Information [Line Items]
Capital expenditures	22.7	19.7	13.4
Depreciation and amortization	33.0	36.7	37.8
Operating Segments | Financial Services
Segment Reporting Information [Line Items]
Capital expenditures	0.8	0.5	1.2
Depreciation and amortization	0.7	0.8	0.6
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	3.1	3.2	4.7
Depreciation and amortization	$ 3.5	$ 3.1	$ 2.9

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&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://fasb.org/us-gaap/role/ref/legacyRef
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