Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	May 31, 2012	May 31, 2011
Cash flows from operating activities:
Net income	$ 21,583	$ 6,939
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,264	30,806
Stock-based compensation expense	3,204	4,474
Net loss from early extinguishment of debt		23,025
Other	(1,162)	1,938
(Increase) decrease in operating assets:
Restricted cash	2,455	(4,816)
Accounts receivable and other assets	(611)	(7,269)
Increase (decrease) in operating liabilities:
Accounts payable	834	1,488
Accrued and other liabilities	(1,286)	(1,832)
Income taxes	7,665	(6,517)
Total adjustments	42,363	41,297
Net cash provided by operating activities	63,946	48,236
Cash flows from investing activities:
Purchases of property and equipment	(12,938)	(14,739)
Proceeds from sale of assets	8,562	2,710
Other	(7,806)	1,373
Net cash used in investing activities	(12,182)	(10,656)
Cash flows from financing activities:
Payments on and purchases of debt	(11,271)	(585,235)
Proceeds from borrowings		535,000
Restricted cash for securitization obligations	190	6,245
Debt issuance and extinguishment costs		(39,883)
Purchases of treasury stock	(25,534)
Other	(2,986)	(878)
Net cash used in financing activities	(39,601)	(84,751)
Net increase (decrease) in cash and cash equivalents	12,163	(47,171)
Cash and cash equivalents at beginning of period	29,509	86,036
Cash and cash equivalents at end of period	41,672	38,865
Supplemental cash flow information:
Additions to capital lease obligations	$ 2,036	$ 886