Condensed Consolidated Statements Of Cash Flows $ in Thousands	12 Months Ended
	Aug. 31, 2015 USD ($)	Aug. 31, 2014 USD ($)	Aug. 31, 2013 USD ($)
Cash flows from operating activities
Net income	$ 64,485	$ 47,916	$ 36,701
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	45,892	42,210	40,387
Stock-based compensation expense	3,520	3,742	3,630
Net loss from early extinguishment of debt			4,443
Other	3,743	(1,628)	2,381
(Increase) decrease in operating assets:
Restricted cash	(61)	(1,428)	(2,431)
Accounts receivable and other assets	2,885	(5,977)	1,613
Increase (decrease) in operating liabilities:
Accounts payable	(1,288)	640	2,324
Accrued and other liabilities	10,296	7,347	5,129
Income taxes	6,890	10,726	(6,338)
Total adjustments	71,877	55,632	51,138
Net cash provided by operating activities	136,362	103,548	87,839
Cash flows from investing activities:
Purchases of property and equipment	(42,153)	(79,008)	(41,338)
Proceeds from sale of assets	13,701	2,148	33,475
Other	3,132	6,337	6,679
Net cash used in investing activities	(25,320)	(70,523)	(1,184)
Cash flows from financing activities:
Payments on debt	(90,290)	(9,976)	(189,499)
Proceeds from borrowings	91,000		155,000
Restricted cash for securitization obligations	151	181	1,921
Purchases of treasury stock	(120,463)	(79,786)	(36,582)
Proceeds from exercise of stock options	18,732	17,407	16,343
Payment of dividends	(18,808)
Debt issuance and extinguishment costs	(12)	(151)	(5,137)
Other	145	(2,902)	(3,452)
Net cash used in financing activities	(119,545)	(75,227)	(61,406)
Net increase (decrease) in cash and cash equivalents	(8,503)	(42,202)	25,249
Cash and cash equivalents at beginning of year	35,694	77,896	52,647
Cash and cash equivalents at end of year	27,191	35,694	77,896
Cash paid during the year for:
Interest	23,330	23,701	27,352
Income taxes (net of refunds)	11,360	14,143	25,440
Non-cash investing and financing activities:
Change in obligation to acquire treasury stock	3,323	259	(1,102)
Notes receivable and direct financing leases from property dispositions			8,661
Stock options exercised by stock swap	3,385	4,634
Change in obligation for purchase of property and equipment	(2,121)	3,097	$ (477)
Dividend payable	$ 13	$ 4,852