Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) $ in Millions	3 Months Ended
	Apr. 03, 2021 USD ($)
Goodwill [Roll Forward]
Balance as of December 28, 2019	$ 982.4
Currency translation	(15.8)
Acquisitions and related adjustments	195.2
Balance as of June 27, 2020	1,161.8
Commercial & Industrial Group
Goodwill [Roll Forward]
Balance as of December 28, 2019	331.2
Currency translation	(10.8)
Acquisitions and related adjustments	0.0
Balance as of June 27, 2020	320.4
Snap-on Tools Group
Goodwill [Roll Forward]
Balance as of December 28, 2019	12.4
Currency translation	0.0
Acquisitions and related adjustments	0.0
Balance as of June 27, 2020	12.4
Repair Systems & Information Group
Goodwill [Roll Forward]
Balance as of December 28, 2019	638.8
Currency translation	(5.0)
Acquisitions and related adjustments	195.2
Balance as of June 27, 2020	$ 829.0