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Pension and Savings Plans - Additional Information (Detail) - USD ($) | 4 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 25, 2018 | Aug. 31, 2019 | Aug. 25, 2018 | Aug. 26, 2017
Retirement Benefits [Abstract] |  |  |  |
Consecutive years of highest compensation used to determine defined benefit pension plan benefits |  | 5 years |  |
Annual contributions by the Company to pension plans | $ 11,400,000 |  | $ 11,596,000 |
Pension termination charges (refund) | $ 130,300,000 | $ (6,796,000) | 130,263,000 |
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 |  | $ 25,800,000 | $ 23,100,000 | $ 21,000,000

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