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Retirement and Post Retirement Plans (Schedule Of Defined Benefit Pension Assets Investment) (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 162.1 $ 126.6  
Equity investments, Target Allocation 100.00%    
Target Return 7.20%    
Equity investments, Actual Allocation 100.00% 100.00%  
Other Credit Derivatives [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity investments, Target Allocation 5.00%    
Target Return 7.00%    
Equity investments, Actual Allocation 4.00% 5.00%  
Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity investments, Target Allocation 19.00%    
Fixed income, Target Return minimum 3.70%    
Fixed income, Target Return maximum 4.40%    
Equity investments, Actual Allocation 26.00% 0.00%  
U S Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity investments, Target Allocation 76.00%    
Equity investments, Target Return minimum 6.70%    
Equity investments, Target Return maximum 8.40%    
Equity investments, Actual Allocation 70.00% 71.00%  
Common Collective Trust Funds [Member] | Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 12.4 $ 9.5  
Common Collective Trust Funds [Member] | U S Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 31.4 23.9  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 103.8 81.7  
Level 1 | Common Collective Trust Funds [Member] | Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Level 1 | Common Collective Trust Funds [Member] | U S Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 43.8 33.4  
Level 2 | Common Collective Trust Funds [Member] | Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 12.4 9.5  
Level 2 | Common Collective Trust Funds [Member] | U S Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 31.4 23.9  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 14.5 11.5 $ 10.1
Level 3 | Common Collective Trust Funds [Member] | Fixed Income Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Level 3 | Common Collective Trust Funds [Member] | U S Equity Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 0.0 $ 0.0