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Pension and Other Postretirement Benefits (Detail) - Weighted-average assumptions used to determine net periodic benefit cost	3 Months Ended
	Mar. 23, 2013	Mar. 24, 2012
Pension Plans, Defined Benefit [Member]
Weighted-average assumptions:
Discount rate	3.70%	4.35%
Expected return on plan assets	6.00%	6.00%
Rate of compensation increase
Other Benefits [Member]
Weighted-average assumptions:
Discount rate	3.70%	4.35%
Expected return on plan assets
Rate of compensation increase

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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