Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
Feb. 28, 2015	Feb. 28, 2014
Cash flows from operating activities:
Net income	$ 17,747us-gaap_NetIncomeLoss	$ 12,315us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,199us-gaap_DepreciationAndAmortization	20,065us-gaap_DepreciationAndAmortization
Stock-based compensation expense	1,785us-gaap_ShareBasedCompensation	1,839us-gaap_ShareBasedCompensation
Other	(775)	(2,321)
Decrease in operating assets:
Restricted cash	5,884	3,447
Accounts receivable and other assets	7,776	6,277
Increase (decrease) in operating liabilities:
Accounts payable	(411)	(2,216)
Accrued and other liabilities	(4,748)	(5,215)
Income taxes	6,326	1,729
Total adjustments	39,036	23,605
Net cash provided by operating activities	56,783	35,920
Cash flows from investing activities:
Purchases of property and equipment	(23,351)	(31,587)
Proceeds from sale of assets	2,332	1,030
Other	3,088	3,002
Net cash used in investing activities	(17,931)	(27,555)
Cash flows from financing activities:
Payments on debt	(4,895)us-gaap_RepaymentsOfLongTermDebt	(4,893)us-gaap_RepaymentsOfLongTermDebt
Proceeds from borrowings	48,500us-gaap_ProceedsFromIssuanceOfDebt
Purchases of treasury stock	(95,597)	(57,847)
Proceeds from exercise of stock options	14,323	12,327
Payment of dividends	(9,469)us-gaap_PaymentsOfDividends
Other	(176)	(731)
Net cash used in financing activities	(47,314)	(51,144)
Net increase in cash and cash equivalents	(8,462)	(42,779)
Cash and cash equivalents at beginning of period	35,694	77,896
Cash and cash equivalents at end of period	27,232	35,117
Cash paid during the period for:
Income taxes (net of refunds)	1,708us-gaap_IncomeTaxesPaidNet	4,638us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities:
Change in obligation to acquire treasury stock	(259)	530
Change in obligation for purchase of property and equipment	$ (174)	$ 371

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