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