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Accumulated Other Comprehensive Income (Loss) Reclassification from AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 25, 2017
Feb. 27, 2016
Feb. 25, 2017
Feb. 27, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior service credit (net of tax) $ 12,177 $ 1,242 $ 25,035 $ 2,302
Amortization of net actuarial loss (net of tax) 4,764 260 9,696 491
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications (7,413) (982) (15,339) (1,811)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Operating expenses [Member] | Amortization of prior service credit        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior service credit (net of tax) (12,177) (1,242) (25,035) (2,302)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Operating expenses [Member] | Amortization of net actuarial loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of net actuarial loss (net of tax) $ 4,764 $ 260 $ 9,696 $ 491