Employee Benefit Plans - Expected Benefit Payments (Details) - USD ($) $ in Thousands	Aug. 29, 2020	Aug. 31, 2019	Aug. 25, 2018
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2021	$ 723
2022	214
2023	313
2024	307
2025	379
Thereafter	3,532
Total benefit payments	5,468	$ 5,566	$ 7,449
SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2021	1,194
2022	1,363
2023	1,364
2024	1,560
2025	1,625
Thereafter	31,510
Total benefit payments	$ 38,616	$ 35,967	$ 27,547