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Asset Retirement Obligations (Tables)
 9 Months Ended
May 26, 2012
Asset Retirement Obligations [Abstract]  
Reconciliation of asset retirement liabilities
A reconciliation of the Company's asset retirement liability is as follows (in thousands):

     
May 26,
2012
 
Beginning balance as of August 27, 2011
 
$
9,488
 
Accretion expense
   
473
 
Ending balance as of May 26, 2012
 
$
9,961