Employee Benefit Plans - Expected Benefit Payments (Details) - USD ($) $ in Thousands	Aug. 25, 2018	Aug. 26, 2017	Aug. 27, 2016
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2019	$ 1,261
2020	545
2021	323
2022	469
2023	431
Thereafter	4,420
Total benefit payments	7,449	$ 8,382	$ 9,000
SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2019	1,057
2020	1,114
2021	1,316
2022	1,314
2023	1,478
Thereafter	21,268
Total benefit payments	$ 27,547	$ 28,801	$ 30,696