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Commitments and Contingencies (Tables)
 3 Months Ended
Nov. 24, 2012
Commitments and Contingencies [Abstract]  
Changes to environmental liabilities
The changes to the Company's environmental liabilities for the thirteen weeks ended November 24, 2012 are as follows (in thousands):

   
November 24, 2012
 
Beginning balance as of August 25, 2012
 $20,020 
Costs incurred for which reserves have been provided
  (247 )
Insurance proceeds received
  33 
Interest accretion
  136 
Changes in discount rates
  (72 )
      
Balance as of November 24, 2012
 $19,870 
Anticipated payments and insurance proceeds of identified environmental remediation liabilities
Anticipated payments and insurance proceeds of currently identified environmental remediation liabilities as of November 24, 2012, for the next five fiscal years and thereafter, as measured in current dollars, are reflected below (in thousands).

(In thousands)
2013
2014
2015
2016
2017
Thereafter
Total
Estimated costs - current dollars
   
$
5,012
 
$
2,470
 
$
1,437
 
$
950
 
$
752
 
$
11,860
 
$
22,481
 
                                               
Estimated insurance proceeds
     
(126
)
 
(173
)
 
(159
)
 
(173
)
 
(159
)
 
(1,743
)
 
(2,533
)
                                               
Net anticipated costs
   
$
4,886
 
$
2,297
 
$
1,278
 
$
777
 
$
593
 
$
10,117
 
$
19,948
 
                                               
Effect of inflation
                                         
6,839
 
Effect of discounting
                                         
(6,917
)
                                               
Balance as of November 24, 2012
                                       
$
19,870