Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Cash flows from operating activities
Net income	$ 47,916	$ 36,701	$ 36,085
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	42,210	40,387	41,914
Stock-based compensation expense	3,742	3,630	4,295
Net loss from early extinguishment of debt		4,443
Other	(1,628)	2,381	788
(Increase) decrease in operating assets:
Restricted cash	(1,428)	(2,431)	2,586
Accounts receivable and other assets	(5,977)	1,613	(2,591)
Increase (decrease) in operating liabilities:
Accounts payable	640	2,324	(932)
Accrued and other liabilities	7,347	5,129	(828)
Income taxes	10,726	(6,338)	13,811
Total adjustments	55,632	51,138	59,043
Net cash provided by operating activities	103,548	87,839	95,128
Cash flows from investing activities:
Purchases of property and equipment	(79,008)	(41,338)	(24,175)
Proceeds from sale of assets	2,148	33,475	9,929
Other	6,337	6,679	(9,863)
Net cash used in investing activities	(70,523)	(1,184)	(24,109)
Cash flows from financing activities:
Payments on and purchases of debt	(9,976)	(189,499)	(15,220)
Proceeds from borrowings		155,000
Restricted cash for securitization obligations	181	1,921	269
Purchases of treasury stock	(79,786)	(36,582)	(30,000)
Proceeds from exercise of stock options	17,407	16,343	280
Debt issuance and extinguishment costs	(151)	(5,137)	(57)
Other	(2,902)	(3,452)	(3,153)
Net cash used in financing activities	(75,227)	(61,406)	(47,881)
Net increase (decrease) in cash and cash equivalents	(42,202)	25,249	23,138
Cash and cash equivalents at beginning of year	77,896	52,647	29,509
Cash and cash equivalents at end of year	35,694	77,896	52,647
Cash paid during the year for:
Interest	23,701	27,352	29,283
Income taxes (net of refunds)	14,143	25,440	11,114
Non-cash investing and financing activities:
Change in obligation to acquire treasury stock	259	(1,102)	1,102
Notes receivable and direct financing leases from property dispositions		8,661
Stock options exercised by stock swap	4,634
Change in obligation for purchase of property and equipment	3,097	(477)	(1,061)
Dividend payable	$ 4,852