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Segments - Capital Expenditures, Depreciation and Amortization (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Segment Reporting Information [Line Items]
Capital expenditures	$ 80.4	$ 80.6	$ 70.6
Depreciation and amortization	82.5	79.5	76.7
Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital expenditures	79.1	76.4	65.4
Depreciation and amortization	79.7	76.8	74.4
Operating Segments [Member] | Commercial & Industrial Group [Member]
Segment Reporting Information [Line Items]
Capital expenditures	31.0	28.5	25.3
Depreciation and amortization	20.1	20.8	20.3
Operating Segments [Member] | Snap-on Tools Group [Member]
Segment Reporting Information [Line Items]
Capital expenditures	38.1	36.9	26.6
Depreciation and amortization	24.9	21.4	19.5
Operating Segments [Member] | Repair Systems & Information Group [Member]
Segment Reporting Information [Line Items]
Capital expenditures	9.0	10.6	13.0
Depreciation and amortization	34.0	33.7	33.8
Operating Segments [Member] | Financial Services [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1.0	0.4	0.5
Depreciation and amortization	0.7	0.9	0.8
Corporate [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1.3	4.2	5.2
Depreciation and amortization	$ 2.8	$ 2.7	$ 2.3

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=56944662&loc=d3e3602-108585

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X

- 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
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: 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=56944662&loc=d3e3213-108585

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- Definition

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+ References

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