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Actuarial Assumptions Used in Determining Projected Benefit Obligation (Detail)	12 Months Ended
	Aug. 25, 2012	Aug. 27, 2011	Aug. 28, 2010
Weighted average discount rate	3.90%	5.13%	5.25%
Expected long-term rate of return on plan assets	7.50%	8.00%	8.00%

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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