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Exit and Disposal Activities - Components of Exit and Disposal Accrual Activity (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 4.0  
Provision 2.0 2.7
Usage (0.7)  
Ending Balance 5.3  
Severance costs [Member] | Commercial & Industrial Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 1.5  
Provision     
Usage (0.3)  
Ending Balance 1.2  
Severance costs [Member] | Snap-on Tools Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 0.2  
Provision     
Usage (0.1)  
Ending Balance 0.1  
Severance costs [Member] | Repair Systems & Information Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 2.3  
Provision 2.0  
Usage (0.3)  
Ending Balance $ 4.0