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Schedule of Accumulated Benefit Obligations In Excess Of Fair Value of Plan Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 25, 2012
Nov. 27, 2011
Accumulated benefit obligations in excess of plan assets    
Aggregate accumulated benefit obligation $ 1,335,827 $ 1,133,801
Aggregate fair value of plan assets 859,373 713,818
Projected benefit obigations in excess of plan assets    
Aggregate projected benefit obligation 1,388,650 1,203,677
Aggregate fair value of plan assets $ 894,362 $ 771,914