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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Income Tax [Line Items]
Effective income tax rate	24.30%	26.20%
Tax Cuts And Jobs Act Of 2017, incomplete accounting, increase (decrease) in provisional income tax expense		$ 2.6
Tax Cuts And Jobs Act Of 2017, incomplete accounting, increase in provisional income tax rate, basis points		120.00%
Minimum
Income Tax [Line Items]
Decrease in unrecognized tax benefits	$ 0.0
Increase in unrecognized tax benefits	0.0
Maximum
Income Tax [Line Items]
Decrease in unrecognized tax benefits	2.4
Increase in unrecognized tax benefits	$ 1.0

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

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Income Tax [Line Items]

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Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Increase (Decrease) In Provisional Income Tax Rate

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase reasonably possible in the next twelve months for the unrecognized tax benefit.

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