Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011
Revenues:
Company Drive-In sales	$ 87,185	$ 86,435	$ 183,967	$ 183,709
Franchise Drive-Ins:
Franchise royalties	25,590	24,813	54,381	53,825
Franchise fees	364	517	649	886
Lease revenue	1,261	1,152	2,549	2,519
Other	684	606	1,817	1,730
Total revenues	115,084	113,523	243,363	242,669
Costs and expenses:
Food and packaging	24,686	24,564	52,411	51,563
Payroll and other employee benefits	32,740	32,718	67,824	68,275
Other operating expenses, exclusive of depreciation and amortization included below	20,727	20,810	43,638	43,216
Total costs and expenses	78,153	78,092	163,873	163,054
Selling, general and administrative	16,084	15,285	31,501	31,566
Depreciation and amortization	10,510	10,367	20,976	20,667
Provision for impairment of long-lived assets	173	176	173	264
Total operating expenses	104,920	103,920	216,523	215,551
Other operating income (expense), net	384	(2)	462	275
Income from operations	10,548	9,601	27,302	27,393
Interest expense	7,930	8,141	15,971	16,423
Interest income	(139)	(149)	(303)	(352)
Gain from early extinguishment of debt		(5,205)		(5,205)
Net interest expense	7,791	2,787	15,668	10,866
Income before income taxes	2,757	6,814	11,634	16,527
Provision for income taxes	1,080	2,466	4,458	4,937
Net income	$ 1,677	$ 4,348	$ 7,176	$ 11,590
Basic income per share	$ 0.03	$ 0.07	$ 0.12	$ 0.19
Diluted income per share	$ 0.03	$ 0.07	$ 0.12	$ 0.19