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Assumptions Used to Determine Postretirement Cost (Detail) (Other Postretirement Benefit Plans, Defined Benefit)	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.75%	5.30%	5.80%
Health care cost trend on coverage	6.50%	6.50%	6.50%
Ultimate trend rate	5.00%	5.00%	5.00%
Year that ultimate trend rate is reached	2016	2015	2014

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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