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Change in Fair Value of Level 3 Assets (Detail) (USD $) In Thousands, unless otherwise specified				12 Months Ended
	Aug. 25, 2012	Aug. 27, 2011	Aug. 28, 2010	Aug. 25, 2012 Level 3 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Beginning balance	$ 181,409	$ 156,883	$ 117,243	$ 5,281
Assets held				55
Assets sold during the year				168
Sales and settlements				(3,100)
Ending balance	$ 181,409	$ 156,883	$ 117,243	$ 2,404

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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