Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 26, 2017	Aug. 27, 2016
Income Tax Disclosure [Abstract]
Beginning balance	$ 27,726	$ 28,434
Additions based on tax positions related to the current year	7,089	7,172
Additions for tax positions of prior years	278	95
Reductions for tax positions of prior years	(6,954)	(2,405)
Reductions due to settlements	(1,964)	(858)
Reductions due to statute of limitations	(3,974)	(4,712)
Ending balance	$ 22,201	$ 27,726