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Note 10 - Commitments and Contingencies (Tables)
 9 Months Ended
May 28, 2016
Notes Tables  
Schedule of Environmental Liabilities [Table Text Block]
 
 
May 28, 2016
 
Beginning balance as of August 29, 2015
   $ 23,307  
Costs incurred for which reserves had been provided
     (820
)
Insurance proceeds
    68  
Interest accretion
     502  
Change in discount rates
     579  
         
Balance as of May 28, 2016
   $ 23,636  
Schedule of Environmental Remediation Liabilities [Table Text Block]
(In thousands)
 
2016
 
 
2017
 
 
2018
 
 
2019
 
 
2020
 
 
Thereafter
 
 
Total
 
Estimated costs – current dollars
   $ 6,593     $ 1,829     $ 1,476     $ 1,309     $ 1,361     $ 12,493     $ 25,061  
                                                         
Estimated insurance proceeds
     (91
)
     (173
)
     (159
)
     (173
)
     (159
)
     (1,293
)
     (2,048
)
                                                         
Net anticipated costs
   $ 6,502     $ 1,656     $ 1,317     $ 1,136     $ 1,202     $ 11,200     $ 23,013  
                                                         
Effect of inflation
                                                     7,757  
Effect of discounting
                                                     (7,134
)
                                                         
Balance as of May 28, 2016
                                                   $ 23,636