Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	May. 31, 2015	May. 31, 2014
Cash flows from operating activities:
Net income	$ 38,189	$ 29,091
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	34,634	31,087
Stock-based compensation expense	2,572	2,784
Provision for deferred income taxes	10,088	3,832
Other	(3,644)	(2,397)
(Increase) decrease in operating assets:
Restricted cash	3,312	1,979
Accounts receivable and other assets	(931)	(4,168)
Increase (decrease) in operating liabilities:
Accounts payable	2,105	(1,435)
Accrued and other liabilities	8,098	4,317
Income taxes	6,079	5,968
Total adjustments	62,313	41,967
Net cash provided by operating activities	100,502	71,058
Cash flows from investing activities:
Purchases of property and equipment	(30,867)	(54,738)
Proceeds from sale of assets	4,089	1,653
Other	4,148	(415)
Net cash used in investing activities	(22,630)	(53,500)
Cash flows from financing activities:
Payments on debt	(63,842)	(7,340)
Proceeds from borrowings	67,500
Purchases of treasury stock	(95,597)	(68,884)
Proceeds from exercise of stock options	15,763	16,700
Payment of dividends	(14,153)
Other	(315)	(1,090)
Net cash used in financing activities	(90,644)	(60,614)
Net decrease in cash and cash equivalents	(12,772)	(43,056)
Cash and cash equivalents at beginning of period	35,694	77,896
Cash and cash equivalents at end of period	22,922	34,840
Cash paid during the period for:
Income taxes (net of refunds)	2,927	4,826
Non-cash investing and financing activities:
Change in obligation to acquire treasury stock	(259)	571
Change in obligation for purchase of property and equipment	$ (2,327)	$ 3,113