Income Taxes - Narrative (Detail) - USD ($)	6 Months Ended
Jun. 27, 2020	Jun. 29, 2019
Income Tax [Line Items]
Effective income tax rate	24.20%	23.90%
Minimum
Income Tax [Line Items]
Decrease in unrecognized tax benefits	$ 0
Increase in unrecognized tax benefits	0
Maximum
Income Tax [Line Items]
Decrease in unrecognized tax benefits	2,500,000
Increase in unrecognized tax benefits	$ 900,000

Effective income tax rate on earnings attributable to Snap-on.

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- Definition

Income Tax [Line Items]

+ References

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- Definition

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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- Definition

Amount of increase reasonably possible in the next twelve months for the unrecognized tax benefit.

+ References

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