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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 25, 2018 | Aug. 26, 2017 | Aug. 27, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of prior service credit (net of tax) | $ 0 | $ (25,035) | $ (4,788)
Amortization of net actuarial loss (net of tax) | 27 | 9,705 | 1,010
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications (net of tax) | $ 27 | (15,330) | (3,778)
Operating Expense [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) |  | (25,035) | (4,788)
Operating Expense [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) |  | $ 9,705 | $ 1,010

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