Employee Benefit Plans - Expected Benefit Payments (Details) - USD ($) $ in Thousands	Aug. 26, 2017	Aug. 27, 2016	Aug. 29, 2015
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2018	$ 896
2019	732
2020	566
2021	396
2022	572
Thereafter	5,220
Total benefit payments	8,382	$ 9,000	$ 8,479
SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2018	1,049
2019	1,051
2020	1,113
2021	1,325
2022	1,326
Thereafter	22,937
Total benefit payments	$ 28,801	$ 30,696	$ 23,755