Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2013	Nov. 30, 2012
Cash flows from operating activities
Net income	$ 8,208	$ 6,133
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,034	10,595
Stock-based compensation expense	828	1,043
Other	(1,383)	169
Decrease in operating assets:
Restricted cash	4,912	2,091
Accounts receivable and other assets	3,799	3,857
Increase (decrease) in operating liabilities:
Accounts payable	(3,088)	695
Accrued and other liabilities	(4,947)	(4,424)
Income taxes	9,700	(5,397)
Total adjustments	19,855	8,629
Net cash provided by operating activities	28,063	14,762
Cash flows from investing activities
Purchases of property and equipment	(7,618)	(5,892)
Proceeds from sale of assets	616	2,115
Other	1,271	513
Net cash used in investing activities	(5,731)	(3,264)
Cash flows from financing activities
Payments on debt	(2,446)	(3,759)
Purchases of treasury stock	(7,155)	(16,882)
Proceeds from exercise of stock options	5,961	327
Other	(695)	(1,101)
Net cash used in financing activities	(4,335)	(21,415)
Net increase (decrease) in cash and cash equivalents	17,997	(9,917)
Cash and cash equivalents at beginning of period	77,896	52,647
Cash and cash equivalents at end of period	95,893	42,730
Non-cash financing activities:
Change in obligation to acquire treasury stock	$ 355	$ 1,194