Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 30, 2014	Aug. 31, 2013
Deferred tax assets:
Net operating loss and credit carryforwards	$ 40,507	$ 41,785
Insurance reserves	16,354	16,237
Accrued benefits	79,932	67,350
Pension	21,493	18,004
Other	43,078	45,597
Total deferred tax assets	201,364	188,973
Less: Valuation allowances	(10,604)	(11,593)
Net deferred tax assets	190,760	177,380
Deferred tax liabilities:
Property and equipment	(59,016)	(84,512)
Inventory	(273,005)	(262,653)
Other	(36,785)	(27,341)
Total deferred tax liabilities	(368,806)	(374,506)
Net deferred tax liability	$ (178,046)	$ (197,126)