Note 10 - Related Parties (Details) - Affiliated Rents Paid for Restaurant Property Lease (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 12, 2014	Feb. 13, 2013	Feb. 12, 2014	Feb. 13, 2013
AFFILIATED COSTS INCURRED:
General and administrative expenses	$ 8,117	$ 7,652	$ 16,184	$ 15,072
AFFILIATED COSTS INCURRED AS A PERCENTAGE OF RELATIVE TOTAL COMPANY COSTS	0.21%	0.27%	0.21%	0.27%
Affiliated Cost Incurred [Member]
AFFILIATED COSTS INCURRED:
General and administrative expenses				25
Other operating expenses, occupancy costs and opening costs			163	145
Total			163	170
Relative Company Cost [Member]
AFFILIATED COSTS INCURRED:
General and administrative expenses			16,184	15,072
Capital expenditures			19,082	11,435
Other operating expenses, occupancy costs and opening costs			41,814	36,780
Total			$ 77,080	$ 63,287