Condensed Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Revenues:
Company Drive-In sales	$ 64,286	$ 95,313	$ 151,438	$ 199,196
Franchise Drive-Ins:
Franchise royalties and fees	34,328	36,047	74,467	75,969
Lease revenue	1,675	1,399	3,056	2,991
Other	(131)	401	748	807
Total revenues	100,158	133,160	229,709	278,963
Costs and expenses:
Food and packaging	17,616	26,213	41,732	55,159
Payroll and other employee benefits	25,332	35,359	57,098	71,723
Other operating expenses, exclusive of depreciation and amortization included below	14,278	20,100	33,704	43,008
Total cost of Company Drive-In sales	57,226	81,672	132,534	169,890
Selling, general and administrative	18,296	20,785	38,050	41,725
Depreciation and amortization	9,734	11,057	20,011	22,056
Other operating income, net	(7,725)	(2,566)	(10,565)	(2,965)
Total costs and expenses	77,531	110,948	180,030	230,706
Income from operations	22,627	22,212	49,679	48,257
Interest expense	7,227	6,467	14,416	12,689
Interest income	(262)	(105)	(756)	(205)
Net interest expense	6,965	6,362	13,660	12,484
Income before income taxes	15,662	15,850	36,019	35,773
Provision for income taxes	4,699	5,031	11,938	12,496
Net income	$ 10,963	$ 10,819	$ 24,081	$ 23,277
Basic income per share (usd per share)	$ 0.25	$ 0.22	$ 0.54	$ 0.47
Diluted income per share (usd per share)	0.25	0.22	0.53	0.46
Cash dividends declared per common share (usd per share)	$ 0.14	$ 0.11	$ 0.28	$ 0.22