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Assumptions Used to Determine Defined Benefit Plans Costs (Detail) (Pension Plan, Defined Benefit [Member])
12 Months Ended
Dec. 29, 2013
Dec. 30, 2012
Dec. 25, 2011
Pension Plan, Defined Benefit [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Discount rate 4.08% 4.83% 5.49%
Expected return on plan assets 7.94% 7.95% 8.46%
Rate of compensation increase 2.97% 2.96% 2.95%