Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Revenues:
Company Drive-In sales	$ 108,445	$ 110,070	$ 285,607	$ 294,037
Franchise Drive-Ins:
Franchise royalties and fees	35,833	35,801	91,749	90,831
Lease revenue	1,089	2,056	3,524	4,605
Other	1,267	1,500	2,903	3,317
Total revenues	146,634	149,427	383,783	392,790
Costs and expenses:
Food and packaging	30,776	30,600	80,954	83,011
Payroll and other employee benefits	37,924	38,539	102,837	106,363
Other operating expenses, exclusive of depreciation and amortization included below	21,356	22,261	62,143	65,899
Total cost of company drive-in sales	90,056	91,400	245,934	255,273
Selling, general and administrative	16,943	16,951	48,540	48,452
Depreciation and amortization	9,783	10,288	30,447	31,264
Provision for impairment of long-lived assets		203		376
Other operating income, net	(142)	(151)	(353)	(613)
Total costs and expenses	116,640	118,691	324,568	334,752
Income from operations	29,994	30,736	59,215	58,038
Interest expense	7,170	7,836	22,293	23,807
Interest income	(153)	(174)	(462)	(477)
Loss from early extinguishment of debt			492
Net interest expense	7,017	7,662	22,323	23,330
Income before income taxes	22,977	23,074	36,892	34,708
Provision for income taxes	8,184	8,667	12,389	13,125
Net income	$ 14,793	$ 14,407	$ 24,503	$ 21,583
Basic income per share	$ 0.26	$ 0.24	$ 0.43	$ 0.36
Diluted income per share	$ 0.26	$ 0.24	$ 0.43	$ 0.36