Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Revenues:
Company Drive-In sales	$ 296,101	$ 425,795	$ 436,031
Franchise Drive-Ins:
Franchise royalties and fees	170,527	170,319	161,342
Lease revenue	7,436	7,459	5,583
Other	3,203	2,747	3,133
Total revenues	477,267	606,320	606,089
Company Drive-Ins:
Food and packaging	80,971	118,136	121,701
Payroll and other employee benefits	107,477	150,260	151,801
Other operating expenses, exclusive of depreciation and amortization included below	61,463	88,424	90,436
Total cost of Company Drive-In sales	249,911	356,820	363,938
Selling, general and administrative	78,687	82,089	79,336
Depreciation and amortization	39,248	44,418	45,892
Provision for impairment of long-lived assets	1,140	232	1,440
Other operating income, net	(14,994)	(4,691)	(945)
Total costs and expenses	353,992	478,868	489,661
Income from operations	123,275	127,452	116,428
Interest expense	29,206	26,714	25,114
Interest income	(1,398)	(516)	(408)
Loss from early extinguishment of debt	0	8,750	0
Net interest expense	27,808	34,948	24,706
Income before income taxes	95,467	92,504	91,722
Provision for income taxes	31,804	28,437	27,237
Net income	$ 63,663	$ 64,067	$ 64,485
Basic income per share (usd per share)	$ 1.47	$ 1.32	$ 1.23
Diluted income per share (usd per share)	1.45	1.29	1.20
Cash dividends declared per common share (usd per share)	$ 0.56	$ 0.44	$ 0.27