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Exit And Disposal Activities (Components Of Exit And Disposal Accrual Activity) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 8.4 $ 10.5
Provision 8.8 8.2
Usage (10.0) (10.3)
Ending Balance 7.2 8.4
Employee Severance [Member] | Commercial & Industrial Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 3.6 2.8
Provision 8.7 4.3
Usage (6.1) (3.5)
Ending Balance 6.2 3.6
Employee Severance [Member] | Snap-On Tools Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 0.6 3.5
Provision (0.1) 1.8
Usage (0.4) (4.7)
Ending Balance 0.1 0.6
Employee Severance [Member] | Repair Systems & Information Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 3.8 3.3
Provision 0.2 2.1
Usage (3.3) (1.6)
Ending Balance 0.7 3.8
Employee Severance [Member] | Corporate [Member]
    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance   0.2
Usage   (0.2)
Facility Closing [Member] | Commercial & Industrial Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 0.4 0.5
Usage (0.2) (0.1)
Ending Balance 0.2 0.4
Facility Closing [Member] | Snap-On Tools Group [Member]
    
Restructuring Cost and Reserve [Line Items]    
Beginning Balance   0.2
Usage   $ (0.2)