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Assumptions Used to Determine Defined Benefit Plans Costs (Detail) (Pension Plans, Defined Benefit)	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Pension Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.83%	5.49%	5.88%
Expected return on plan assets	8.25%	8.75%	8.75%
Rate of compensation increase	2.96%	2.95%	2.88%

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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