Income Taxes - Reconciliation of Provision for Income Taxes (Detail)		8 Months Ended	12 Months Ended
	Dec. 31, 2017	Aug. 25, 2018	Aug. 25, 2018	Aug. 26, 2017	Aug. 27, 2016
Income Tax Disclosure [Abstract]
Federal tax at statutory U.S. income tax rate	35.00%	21.00%	25.90%	35.00%	35.00%
State income taxes, net			1.90%	1.30%	1.60%
Transition tax			1.60%
Share-based compensation			(1.60%)	(1.40%)
Impact of tax reform			(9.60%)
Other			0.10%	(1.40%)	(1.50%)
Effective tax rate			18.30%	33.50%	35.10%