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Pension and Other Postretirement Benefits (Detail) - Weighted-average assumptions of net periodic benefit cost	9 Months Ended
	Oct. 06, 2012	Oct. 08, 2011
Pension Benefits [Member]
Weighted-average assumptions:
Discount rate	4.35%	5.10%
Expected return on plan assets	6.00%	6.00%
Rate of compensation increase
Other Benefits [Member]
Weighted-average assumptions:
Discount rate	4.35%	5.10%
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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