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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 29, 2015
Aug. 30, 2014
Aug. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of prior service credit (net of tax) $ 3,428 $ 3,582 $ 3,226
Amortization of net actuarial loss (net of tax) (918) (749) $ (1,264)
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total reclassifications (net of tax) (2,510) (2,833)  
Cost of Sales [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of prior service credit (net of tax) (3,428) (3,582)  
Cost of Sales [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of net actuarial loss (net of tax) $ 918 $ 749