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Accumulated Pension Benefit Obligation for ORPB Plan (Detail) (Other Postretirement Benefit Plans, Defined Benefit)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2013 Scenario, Forecast
Defined Benefit Plan Disclosure [Line Items]
Health care costs trend rate assumed for next year	7.50%	7.50%
Rate of increase to which the cost of benefits is assumed to decline (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2017	2018

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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