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Summary of Company's Balance Sheet Related Pension and Other Postretirement Benefit Plan (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 20, 2013
Dec. 29, 2012
Post-Retirement Plans [Abstract]    
Current benefit liability $ 1,288 $ 1,288
Noncurrent benefit liability 156,095 159,158
Accumulated other comprehensive loss, net of tax $ 109,598 $ 110,567