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Postretirement Benefits Postretirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components $ 29
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components (23)
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensice Income (Loss) in Next Fiscal Year, Net Losses 144
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year (357)
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 325
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation $ (261)