Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 26, 2017	Aug. 27, 2016
Deferred tax assets:
Net operating loss and credit carryforwards	$ 48,062	$ 50,859
Accrued benefits	96,664	93,212
Other	56,052	68,600
Total deferred tax assets	200,778	212,671
Less: Valuation allowances	(13,501)	(13,338)
Net deferred tax asset	187,277	199,333
Deferred tax liabilities:
Property and equipment	(117,580)	(93,943)
Inventory	(333,422)	(315,563)
Prepaid Expenses	(60,920)	(27,395)
Other	(11,158)	(10,077)
Total deferred tax liabilities	(523,080)	(446,978)
Net deferred tax liability	$ (335,803)	$ (247,645)