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Comprehensive Income (Changes in AOCI by component) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 29, 2015
Aug. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of year $ (1,808) $ 849
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]    
OCI before reclassifications 2,044 176
Amounts reclassified from AOCI (2,510) (2,833)
Net current-period OCI (466) (2,657)
Balance at end of year (2,274) (1,808)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of year (1,808) 1,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]    
OCI before reclassifications 2,044 25
Amounts reclassified from AOCI (2,510) (2,833)
Net current-period OCI (466) (2,808)
Balance at end of year (2,274) (1,808)
Unrealized Gains and Losses on Available- for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of year 0 (151)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]    
OCI before reclassifications 0 151
Amounts reclassified from AOCI 0 0
Net current-period OCI 0 151
Balance at end of year $ 0 $ 0