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Asset Retirement Obligations (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Feb. 25, 2012	Feb. 26, 2011
Asset Retirement Obligations [Abstract]
Range of years discount for estimated future costs to decommission its nuclear laundry facilities, minimum years (in years)	1Y
Range of years discount for estimated future costs to decommission its nuclear laundry facilities, maximum years (in years)	32Y
Rollforward of asset retirement liabilities [Abstract]
Beginning balance	$ 9,488
Accretion expense	316	295
Ending balance	$ 9,804

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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