Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Cash flows from operating activities:
Net income	$ 71,205	$ 63,663	$ 64,067
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	38,355	39,248	44,418
Stock-based compensation expense	4,556	3,942	3,766
Loss from debt transactions	1,310	0	8,750
Provision (benefit) for deferred income taxes	(15,812)	(2,469)	4,509
Gain on disposition of assets	(5,086)	(14,994)	(4,691)
Other	3,276	1,265	452
(Increase) decrease in operating assets:
Restricted cash	889	886	(2,829)
Accounts receivable and other assets	(4,354)	1,918	2,109
Increase (decrease) in operating liabilities:
Accounts payable	(2,507)	(4,404)	380
Accrued and other liabilities	(151)	(10,884)	4,520
Income taxes	(135)	(3,299)	(9,242)
Total adjustments	20,341	11,209	52,142
Net cash provided by operating activities	91,546	74,872	116,209
Cash flows from investing activities:
Purchases of property and equipment	(36,690)	(46,528)	(46,553)
Proceeds from sale of assets	21,646	91,741	16,206
Proceeds from the sale of investments in refranchised drive-in operations	0	8,357	0
Issuance of notes receivable	(15,779)	(7,338)	(12,705)
Collections on notes receivable	16,232	11,911	7,229
Other	530	2,345	1,763
Net cash provided by (used in) investing activities	(14,061)	60,488	(34,060)
Cash flows from financing activities:
Purchases of treasury stock	(141,095)	(171,562)	(150,444)
Payment of dividends	(23,914)	(24,062)	(21,309)
Payments on debt	(173,125)	(24,416)	(422,090)
Debt issuance and extinguishment costs	(5,145)	(10)	(18,420)
Proceeds from borrowings	253,000	83,000	563,000
Restricted cash for securitization obligations	33,460	(46,730)	6,587
Proceeds from exercise of stock options	4,147	2,682	3,842
Other	(7,318)	(4,014)	1,586
Net cash used in financing activities	(59,990)	(185,112)	(37,248)
Net increase (decrease) in cash and cash equivalents	17,495	(49,752)	44,901
Cash and cash equivalents at beginning of year	22,340	72,092	27,191
Cash and cash equivalents at end of year	39,835	22,340	72,092
Cash paid during the year for:
Interest	30,581	27,082	24,883
Income taxes (net of refunds)	18,764	37,642	27,821
Non-cash investing and financing activities:
Change in obligation to acquire treasury stock	(1,917)	1,350	(2,099)
Stock options exercised by stock swap	12,375	451	6,396
Accrued PP&E at year end	$ 4,783	$ 1,577	$ 3,471