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Postretirement Benefits Amounts Recognized in Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 30, 2012
Jan. 01, 2012
Compensation and Retirement Disclosure [Abstract]    
Prior service cost $ 3,394 $ 3,753
Net gain (2,311) (1,864)
Deferred Tax Liabilities, Other Comprehensive Income (414) (736)
Accumulated other comprehensive income $ 669 $ 1,153