Leases - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
	Aug. 28, 2021	Aug. 28, 2021	Aug. 29, 2020
Accumulated amortization related to finance lease assets		$ 107.0	$ 107.3
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows from operating leases		300.6	$ 352.9
Land and Building
Additional leases not yet commenced, undiscounted future payments	$ 40.1	40.1
Vehicles
Additional leases not yet commenced, undiscounted future payments	$ 69.2	$ 69.2
Minimum
Operating lease commencement date	2022
Maximum
Operating lease commencement date	2023