Comprehensive Income (Loss) Reclassification from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 26, 2016	Nov. 28, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service credit (net of tax)	$ 12,858	$ 1,060
Amortization of net actuarial loss (net of tax)	(4,932)	(231)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications	(7,926)	(829)
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)	(12,858)	(1,060)
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)	$ (4,932)	$ (231)