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Retirement and Post Retirement Plans (Schedule Of Fair Value Of Plan Assets) (Details) - USD ($)
$ in Millions
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  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 103.8 81.7  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 43.8 33.4  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 14.5 11.5 $ 10.1
Cash And Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4.5 3.1  
Cash And Cash Equivalents [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 4.5 3.1  
Cash And Cash Equivalents [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Cash And Cash Equivalents [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1.0    
Mutual Funds [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1.0    
Mutual Funds [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0    
Mutual Funds [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0    
Domestic Equities [Member] | Common Stock [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 24.9 20.6  
Domestic Equities [Member] | Common Stock [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 24.9 20.6  
Domestic Equities [Member] | Common Stock [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Domestic Equities [Member] | Common Stock [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
International Equities [Member] | Common Stock [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 9.6 8.0  
International Equities [Member] | Common Stock [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 9.6 8.0  
International Equities [Member] | Common Stock [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
International Equities [Member] | Common Stock [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Fixed Income Funds [Member] | Common Collective Trust Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 12.4 9.5  
Fixed Income Funds [Member] | Common Collective Trust Funds [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Fixed Income Funds [Member] | Common Collective Trust Funds [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 12.4 9.5  
Fixed Income Funds [Member] | Common Collective Trust Funds [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Fixed Income Funds [Member] | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 9.7 12.3  
Fixed Income Funds [Member] | Mutual Funds [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 9.7 12.3  
Fixed Income Funds [Member] | Mutual Funds [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0    
Fixed Income Funds [Member] | Mutual Funds [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0    
U.S. Equity Funds [Member] | Common Collective Trust Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 31.4 23.9  
U.S. Equity Funds [Member] | Common Collective Trust Funds [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
U.S. Equity Funds [Member] | Common Collective Trust Funds [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 31.4 23.9  
U.S. Equity Funds [Member] | Common Collective Trust Funds [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
U.S. Equity Funds [Member] | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 15.0 16.8  
U.S. Equity Funds [Member] | Mutual Funds [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 15.0 16.8  
U.S. Equity Funds [Member] | Mutual Funds [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
U.S. Equity Funds [Member] | Mutual Funds [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Balanced Funds [Member] | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 22.3 6.1  
Balanced Funds [Member] | Mutual Funds [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 22.3 6.1  
Balanced Funds [Member] | Mutual Funds [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Balanced Funds [Member] | Mutual Funds [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0    
International Equity Funds [Member] | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 16.8 13.8  
International Equity Funds [Member] | Mutual Funds [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 16.8 13.8  
International Equity Funds [Member] | Mutual Funds [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
International Equity Funds [Member] | Mutual Funds [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Other Plan Asset Category [Member] | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   1.0  
Other Plan Asset Category [Member] | Mutual Funds [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   1.0  
Other Plan Asset Category [Member] | Mutual Funds [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   0.0  
Other Plan Asset Category [Member] | Mutual Funds [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets   0.0  
Real Estate Investment [Member] | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 8.1 6.2  
Real Estate Investment [Member] | Mutual Funds [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Real Estate Investment [Member] | Mutual Funds [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Real Estate Investment [Member] | Mutual Funds [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 8.1 6.2  
Global emerging markets fund limited partnership | Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 6.4 5.3  
Global emerging markets fund limited partnership | Mutual Funds [Member] | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Global emerging markets fund limited partnership | Mutual Funds [Member] | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0  
Global emerging markets fund limited partnership | Mutual Funds [Member] | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 6.4 $ 5.3