Accumulated Other Comprehensive Income (Loss) Reclassification from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 27, 2017	May 28, 2016	May 27, 2017	May 28, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service credit (net of tax)	$ 0	$ 1,243	$ 25,035	$ 3,545
Amortization of net actuarial loss (net of tax)	6	260	9,702	751
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications	6	(983)	(15,333)	(2,794)
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	(1,243)	(25,035)	(3,545)
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	$ 260	$ 9,702	$ 751