Sales and Pretax Income (Losses) for Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended											4 Months Ended				12 Months Ended
	May 09, 2012		Feb. 15, 2012		Nov. 23, 2011		May 04, 2011		Feb. 09, 2011		Nov. 17, 2010	Aug. 29, 2012		Aug. 31, 2011		Aug. 29, 2012 Location	Aug. 31, 2011 Location	Aug. 25, 2010 Location
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales																		$ 3,320
Pretax income (loss)																(1,123)	610	(3,492)
Income tax (expense) benefit on discontinued operations																419	(223)	1,102
Discontinued operations, net of taxes	$ (86)	[1]	$ (276)	[1]	$ (379)	[1]	$ (369)	[1]	$ 981	[1]	$ (181)	$ 38	[1]	$ (45)	[1]	$ (704)	$ 386	$ (2,281)
Discontinued locations closed during the period																0	0	22

[1] The year ended August 29, 2012 consists of four four-week periods and the quarter ended August 31, 2011 consists of five four-week periods. All other quarters presented represent three four-week periods.