Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	May 31, 2016	May 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 194,508	$ 178,867
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	28,222	24,229
Stock-based compensation expense	22,433	17,112
Deferred income taxes	3,015	3,041
Loss (gain) on sale of assets	2	(17)
Tax benefits from share-based payment arrangements	(13,327)	(23,926)
Changes in assets and liabilities, net of effects of acquisitions
Accounts receivable, net of reserves	(11,316)	(1,159)
Accounts payable and accrued expenses	3,474	5,973
Accrued compensation	(1,809)	(5,496)
Deferred fees	3,696	5,951
Taxes payable, net of prepaid taxes	20,313	16,213
Prepaid expenses and other assets	1,250	78
Deferred rent and other non-current liabilities	10,812	1,873
Other working capital accounts, net	(169)	103
Net cash provided by operating activities	261,104	222,842
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of businesses, net of cash acquired	(264,087)	(33,556)
Purchases of investments	(12,934)	(12,437)
Proceeds from sales of investments	12,423	7,535
Purchases of property, equipment and leasehold improvements, net of proceeds from dispositions	(34,671)	(15,391)
Net cash used in investing activities	(299,269)	(53,849)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividend payments	(54,042)	(48,404)
Repurchase of common stock	(192,823)	(177,556)
Proceeds from debt	265,000	35,000
Debt issuance costs	(12)	(32)
Proceeds from employee stock plans	38,845	51,852
Tax benefits from share-based payment arrangements	13,327	23,926
Net cash provided by (used in) financing activities	70,295	(115,214)
Effect of exchange rate changes on cash and cash equivalents	(3,608)	(12,262)
Net increase in cash and cash equivalents	28,522	41,517
Cash and cash equivalents at beginning of period	158,914	116,378
Cash and cash equivalents at end of period	$ 187,436	$ 157,895