Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Revenues:
Company Drive-In sales	$ 92,309	$ 81,848	$ 192,447	$ 175,347
Franchise Drive-Ins:
Franchise royalties and fees	32,407	26,582	70,671	57,803
Lease revenue	979	715	2,044	1,601
Other	524	596	913	1,642
Total revenues	126,219	109,741	266,075	236,393
Costs and expenses:
Food and packaging	25,828	23,043	54,401	49,279
Payroll and other employee benefits	33,880	30,031	69,151	63,371
Other operating expenses, exclusive of depreciation and amortization included below	19,924	18,437	42,529	40,244
Total cost of Company Drive-In sales	79,632	71,511	166,081	152,894
Selling, general and administrative	18,138	15,886	36,926	32,891
Depreciation and amortization	11,539	10,031	23,199	20,065
Other operating (income) expense, net	(81)	(36)	340	(165)
Total costs and expenses	109,228	97,392	226,546	205,685
Income from operations	16,991	12,349	39,529	30,708
Interest expense	6,318	6,384	12,599	12,767
Interest income	(97)	(144)	(199)	(261)
Net interest expense	6,221	6,240	12,400	12,506
Income before income taxes	10,770	6,109	27,129	18,202
Provision for income taxes	3,108	2,002	9,382	5,887
Net income	$ 7,662	$ 4,107	$ 17,747	$ 12,315
Basic income per share	$ 0.14	$ 0.07	$ 0.33	$ 0.22
Diluted income per share	$ 0.14	$ 0.07	$ 0.32	$ 0.21