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Exit and Disposal Activities - Components of Exit and Disposal Accrual Activity (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 6.5 $ 4.0
Provision   6.5
Usage (2.4) (4.0)
Ending Balance 4.1 6.5
Severance costs [Member] | Commercial & Industrial Group [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 0.8 1.5
Provision   1.4
Usage (0.5) (2.1)
Ending Balance 0.3 0.8
Severance costs [Member] | Snap-on Tools Group [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance   0.2
Usage   (0.2)
Severance costs [Member] | Repair Systems & Information Group [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 5.7 2.3
Provision   5.1
Usage (1.9) (1.7)
Ending Balance $ 3.8 $ 5.7