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Pension Plans (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 29, 2012
Age
Dec. 31, 2011
Jan. 01, 2011
Normal retirement age 65    
Accumulated benefit obligation $ 1,170.6 $ 1,123.1  
Accumulated pension benefit obligation increase calculated under previous methodology 73.3    
Description of amortization actuarial gains and losses Actuarial gains and losses in excess of 10 percent of the greater of the projected benefit obligation or market-related value of assets are amortized on a straight-line basis over the average remaining service period of active participants.    
Expected long-term rate of return on plan assets 7.70% 7.80% 7.80%
Expense recognized related to 401(k)plan 5.7 5.2 4.3
Minimum [Member]
      
Time horizon for asset under risk and correlation assumption (in years) 10    
Maximum [Member]
      
Time horizon for asset under risk and correlation assumption (in years) 20    
Foreign Pension Plans [Member]
      
Weighted-average discount rate 4.10%    
Increase in pension expense 1.6    
Increase in projected benefit obligation 21.6    
Description of discount rate assumption Lowering Snap-on's foreign discount rate assumption by 50 basis points    
Expected future employer contributions 10.2    
Domestic Pension Plans [Member]
      
Weighted-average discount rate 4.30%    
Weighted average discount rate Snap-On's domestic pension plans calculated under previous methodology 3.70%    
Increase in pension expense 6.3    
Increase in projected benefit obligation 60.5    
Percentage of projected benefit obligations 82.00%    
Description of discount rate assumption Lowering Snap-on's domestic discount rate assumption by 50 basis points    
Expected future employer contributions $ 1.6    
Expected long-term rate of return on plan assets 7.80%