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Exit And Disposal Activities (Recorded Costs Associated With Exit And Disposal Activities) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs $ 16.5 $ 12.2
Commercial & Industrial Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs 8.9 5.6
Snap-On Tools Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs 7.2 4.3
Repair Systems & Information Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs 0.4 2.1
Corporate [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs   0.2
Cost Of Goods Sold [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs 10.9 7.6
Cost Of Goods Sold [Member] | Commercial & Industrial Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs 3.6 2.9
Cost Of Goods Sold [Member] | Snap-On Tools Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs 7.1 3.7
Cost Of Goods Sold [Member] | Repair Systems & Information Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs 0.2 1.0
Operating Expenses [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs 5.6 4.6
Operating Expenses [Member] | Commercial & Industrial Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs 5.3 2.7
Operating Expenses [Member] | Snap-On Tools Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs 0.1 0.6
Operating Expenses [Member] | Repair Systems & Information Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs 0.2 1.1
Operating Expenses [Member] | Corporate [Member]
    
Restructuring Cost and Reserve [Line Items]    
Exit and disposal costs   $ 0.2