Pension and Savings Plans - Additional Information (Detail) - USD ($)	4 Months Ended	12 Months Ended
	Aug. 25, 2018	Aug. 25, 2018	Aug. 26, 2017	Aug. 27, 2016
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	$ 17,761,000
Termination settlement costs	130,300,000
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		$ 23,100,000	$ 21,000,000	$ 19,700,000