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Accumulated Other Comprehensive Income (Loss) Reclassification from AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 25, 2017
Nov. 26, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of prior service credit (net of tax) $ 0 $ 12,858
Amortization of net actuarial loss (net of tax) 6 4,932
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications 6 (7,926)
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 (12,858)
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) $ 6 $ 4,932