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Accumulated Other Comprehensive Income (Loss) Reclassification from AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 24, 2018
Feb. 25, 2017
Feb. 24, 2018
Feb. 25, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior service credit (net of tax) $ 0 $ 12,177 $ 0 $ 25,035
Amortization of net actuarial loss (net of tax) 7 4,764 13 9,696
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications 7 (7,413) 13 (15,339)
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) 0 (12,177) 0 (25,035)
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) $ 7 $ 4,764 $ 13 $ 9,696