Note 1 - Nature of Operations and Significant Accounting Policies (Details) - Reclassified Expenses (USD $)	3 Months Ended												4 Months Ended				12 Months Ended
	May 08, 2013		Feb. 13, 2013		Nov. 21, 2012		May 09, 2012		Feb. 15, 2012		Nov. 23, 2011		Aug. 31, 2013		Aug. 29, 2012		Aug. 28, 2013	Aug. 29, 2012	Aug. 31, 2011
Note 1 - Nature of Operations and Significant Accounting Policies (Details) - Reclassified Expenses [Line Items]
Other operating expenses	$ 0.175	[1]	$ 0.173	[1]	$ 0.181	[1]	$ 0.165	[1]	$ 0.158	[1]	$ 0.175	[1]	$ 0.193	[1]	$ 0.170	[1]	$ 66,381,000	$ 54,233,000	$ 56,830,000
Occupancy costs	(0.056)	[1]	(0.060)	[1]	(0.055)	[1]	(0.053)	[1]	(0.056)	[1]	(0.057)	[1]	(0.063)	[1]	(0.055)	[1]	(21,537,000)	(17,985,000)	(18,090,000)
Group insurance																	(1,763,000)	(1,868,000)	(2,036,000)
401K employer match																	(322,000)	(212,000)
Employee meals																	(8,000)	(15,000)	(681,000)
Payroll and related costs	0.331	[1]	0.351	[1]	0.345	[1]	0.330	[1]	0.346	[1]	0.343	[1]	0.340	[1]	0.345	[1]	126,306,000	112,028,000	115,119,000
Group insurance																	1,763,000	1,868,000	2,036,000
401K employer match																	322,000	212,000
Employee meals																	8,000	15,000	681,000
Scenario, Previously Reported [Member]
Note 1 - Nature of Operations and Significant Accounting Policies (Details) - Reclassified Expenses [Line Items]
Other operating expenses																	90,011,000	74,313,000	77,637,000
Occupancy costs																	(21,537,000)	(17,985,000)	(18,090,000)
Group insurance																	(1,763,000)	(1,868,000)	(2,036,000)
401K employer match																	(322,000)	(212,000)
Employee meals																	(8,000)	(15,000)	(681,000)
Payroll and related costs																	124,213,000	109,933,000	112,402,000
Group insurance																	1,763,000	1,868,000	2,036,000
401K employer match																	322,000	212,000
Employee meals																	$ 8,000	$ 15,000	$ 681,000

[1] The quarters ended August 28, 2013 and August 29, 2012 consists of four four-week periods. All other quarters presented represent three four-week periods.