Condensed Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Revenues:
Company Drive-In sales	$ 53,090	$ 64,286	$ 115,630	$ 151,438
Franchise Drive-Ins:
Franchise royalties and fees	33,737	34,328	74,515	74,467
Lease revenue	1,401	1,675	3,085	3,056
Other	(126)	(131)	300	748
Total revenues	88,102	100,158	193,530	229,709
Costs and expenses:
Food and packaging	14,601	17,616	32,314	41,732
Payroll and other employee benefits	21,083	25,332	43,857	57,098
Other operating expenses, exclusive of depreciation and amortization included below	11,370	14,278	24,949	33,704
Total cost of Company Drive-In sales	47,054	57,226	101,120	132,534
Selling, general and administrative	16,846	18,296	36,615	38,050
Depreciation and amortization	9,560	9,734	18,926	20,011
Other operating income, net	(272)	(7,725)	(493)	(10,565)
Total costs and expenses	73,188	77,531	156,168	180,030
Income from operations	14,914	22,627	37,362	49,679
Interest expense	8,138	7,227	15,813	14,416
Interest income	(455)	(262)	(837)	(756)
Loss from debt transactions	1,310	0	1,310	0
Net interest expense	8,993	6,965	16,286	13,660
Income before income taxes	5,921	15,662	21,076	36,019
Provision for income taxes	(13,686)	4,699	(9,961)	11,938
Net income	$ 19,607	$ 10,963	$ 31,037	$ 24,081
Basic income per share (usd per share)	$ 0.51	$ 0.25	$ 0.80	$ 0.54
Diluted income per share (usd per share)	0.51	0.25	0.79	0.53
Cash dividends declared per common share (usd per share)	$ 0.16	$ 0.14	$ 0.32	$ 0.28