Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Feb. 29, 2012	Feb. 28, 2011
Cash flows from operating activities:
Net income	$ 7,176	$ 11,590
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,976	20,667
Stock-based compensation expense	2,134	3,130
Gain from early extinguishment of debt		(5,205)
Amortization of debt costs to interest expense	1,351	1,625
Other	(2,095)	(572)
Decrease in operating assets:
Restricted cash	5,611	2,443
Accounts receivable and other assets	5,480	54
Decrease in operating liabilities:
Accounts payable	(1,157)	(87)
Accrued and other liabilities	(6,656)	(1,928)
Income taxes	(4,981)	(4,202)
Total adjustments	20,663	15,925
Net cash provided by operating activities	27,839	27,515
Cash flows from investing activities:
Purchases of property and equipment	(7,822)	(9,550)
Proceeds from sale of assets	7,993	2,060
Other	(3,759)	3,879
Net cash used in investing activities	(3,588)	(3,611)
Cash flows from financing activities:
Payments on and purchases of debt	(7,516)	(82,847)
Purchases of treasury stock	(10,451)
Other	(1,844)	2,585
Net cash used in financing activities	(19,811)	(80,262)
Net increase (decrease) in cash and cash equivalents	4,440	(56,358)
Cash and cash equivalents at beginning of period	29,509	86,036
Cash and cash equivalents at end of period	33,949	29,678
Supplemental cash flow information:
Additions to capital lease obligations	$ 1,856