Exit and Disposal Activities - Summary of Exit and Disposal Activities (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	$ 0	$ 4,000,000.0	$ 0	$ 11,500,000
Commercial & Industrial Group
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	2,000,000.0	0	6,400,000
Repair Systems & Information Group
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	1,400,000	0	4,500,000
Snap-on Tools Group
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	600,000	0	600,000
Cost of goods sold:
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	2,000,000.0	0	7,100,000
Cost of goods sold: \| Commercial & Industrial Group
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	2,000,000.0	0	6,400,000
Cost of goods sold: \| Repair Systems & Information Group
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	0	0	700,000
Operating Expenses:
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	2,000,000.0	0	4,400,000
Operating Expenses: \| Repair Systems & Information Group
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	0	1,400,000	0	3,800,000
Operating Expenses: \| Snap-on Tools Group
Restructuring Cost and Reserve [Line Items]
Exit and disposal costs	$ 0	$ 600,000	$ 0	$ 600,000