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Note 7. Asset Retirement Obligations (Details) - Reconciliation of the Asset Retirement Liability (USD $) In Thousands, unless otherwise specified	9 Months Ended
	May 25, 2013	May 26, 2012
Reconciliation of the Asset Retirement Liability [Abstract]
Balance	$ 10,120
Accretion expense	497	473
Balance	$ 10,617

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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