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Retirement Plans (Details 6)
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Pension Benefits
     
Net periodic benefit cost      
Discount rate (as a percent) 4.94% 5.71% 6.20%
Expected long-term rate of return on assets (as a percent) 7.58% 7.84% 8.26%
Rate of compensation increase (as a percent) 3.49% 3.99% 4.00%
Benefit obligations at year-end      
Discount rate 4.23% 4.95% 5.71%
Rate of compensation increases 3.48% 3.49% 3.99%
Postretirement Benefits Other than Pensions
     
Net periodic benefit cost      
Discount rate (as a percent) 4.75% 5.50% 5.50%
Benefit obligations at year-end      
Discount rate 3.75% 4.75% 5.50%