Employee Benefit Plans - Expected Benefit Payments (Details) - USD ($) $ in Thousands	Aug. 31, 2019	Aug. 25, 2018	Aug. 26, 2017
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2020	$ 960
2021	189
2022	250
2023	317
2024	307
Thereafter	3,543
Total benefit payments	5,566	$ 7,449	$ 8,382
SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2020	1,125
2021	1,125
2022	1,340
2023	1,338
2024	1,513
Thereafter	29,526
Total benefit payments	$ 35,967	$ 27,547	$ 28,801