Condensed Consolidated Statements Of Cash Flows $ in Thousands	12 Months Ended
	Aug. 31, 2016 USD ($)	Aug. 31, 2015 USD ($)	Aug. 31, 2014 USD ($)
Cash flows from operating activities:
Net income	$ 64,067	$ 64,485	$ 47,916
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44,418	45,892	42,210
Stock-based compensation expense	3,766	3,520	3,742
Loss from early extinguishment of debt	8,750
Other	270	9,366	735
(Increase) decrease in operating assets:
Restricted cash	(2,829)	(61)	(1,428)
Accounts receivable and other assets	2,109	2,885	(5,977)
Increase (decrease) in operating liabilities:
Accounts payable	380	(1,288)	640
Accrued and other liabilities	4,520	10,296	7,347
Income taxes	(9,242)	1,267	8,363
Total adjustments	52,142	71,877	55,632
Net cash provided by operating activities	116,209	136,362	103,548
Cash flows from investing activities:
Purchases of property and equipment	(46,553)	(42,153)	(79,008)
Proceeds from sale of assets	16,206	13,701	2,148
Other	(3,713)	3,132	6,337
Net cash used in investing activities	(34,060)	(25,320)	(70,523)
Cash flows from financing activities:
Payments on debt	(422,090)	(90,290)	(9,976)
Proceeds from borrowings	563,000	91,000
Restricted cash for securitization obligations	6,587	151	181
Purchases of treasury stock	(150,444)	(120,463)	(79,786)
Proceeds from exercise of stock options	3,842	18,732	17,407
Payment of dividends	(21,309)	(18,808)
Debt issuance and extinguishment costs	(18,420)	(12)	(151)
Other	1,586	145	(2,902)
Net cash used in financing activities	(37,248)	(119,545)	(75,227)
Net increase (decrease) in cash and cash equivalents	44,901	(8,503)	(42,202)
Cash and cash equivalents at beginning of year	27,191	35,694	77,896
Cash and cash equivalents at end of year	72,092	27,191	35,694
Cash paid during the year for:
Interest	24,883	23,330	23,701
Income taxes (net of refunds)	27,821	11,360	14,143
Non-cash investing and financing activities:
Change in obligation to acquire treasury stock	(2,099)	3,323	259
Stock options exercised by stock swap	6,396	3,385	4,634
Accrued PP&E at period end	3,471	3,346	3,297
Dividend payable	$ 44	$ 13	$ 4,852