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Pension and Savings Plans - Additional Information (Detail) - USD ($) $ in Thousands | 4 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 25, 2018 | Aug. 29, 2020 | Aug. 31, 2019 | Aug. 25, 2018
Pension and Savings Plans |  |  |  |
Consecutive years of highest compensation used to determine defined benefit pension plan benefits |  | 5 years |  |
Annual contributions by the Company to pension plans | $ 11,400 |  |  |
Pension termination charges (refund) | $ 130,300 | $ 0 | $ (6,796) | $ 130,263
Periodic pension benefit expense |  | $ 0 |  |
Percentage of company matching retirement savings plan contributions that vest immediately |  | 100.00% |  |
Percentage of savings option up to qualified earnings |  | 25.00% |  |
Annual contribution by employer towards 401(k) Plan |  | $ 29,800 | $ 25,800 | $ 23,100

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