Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	May 31, 2017	May 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 198,707	$ 194,508
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	33,770	28,222
Stock-based compensation expense	20,873	22,433
Loss on sale of business	1,223
Deferred income taxes	8,829	3,015
Loss on disposition of assets	33	2
Tax benefits from share-based payment arrangements	(9,798)	(13,327)
Changes in assets and liabilities, net of effects of acquisitions
Accounts receivable, net of reserves	(29,310)	(11,316)
Accounts payable and accrued expenses	1,548	3,474
Accrued compensation	(17,299)	(1,809)
Deferred fees	2,638	3,696
Taxes payable, net of prepaid taxes	6,081	20,313
Prepaid expenses and other assets	440	1,250
Deferred rent and other non-current liabilities	2,766	10,812
Other working capital accounts, net	(189)	(169)
Net cash provided by operating activities	220,312	261,104
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of businesses, net of cash acquired	(301,843)	(264,087)
Purchases of investments	(29,982)	(12,934)
Proceeds from sales of investments	23,399	12,423
Purchases of property, equipment and leasehold improvements	(25,981)	(34,671)
Net cash used in investing activities	(334,407)	(299,269)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividend payments	(59,124)	(54,042)
Repurchases of common stock	(214,766)	(192,823)
Proceeds from debt	575,000	265,000
Repayment of Debt	(300,000)
Sale of business	(1,223)
Debt issuance costs	(437)	(12)
Proceeds from employee stock plans	42,159	38,845
Tax benefits from share-based payment arrangements	9,798	13,327
Net cash provided by financing activities	51,407	70,295
Effect of exchange rate changes on cash and cash equivalents	(3,961)	(3,608)
Net (decrease) increase in cash and cash equivalents	(66,649)	28,522
Cash and cash equivalents at beginning of period	228,407	158,914
Cash and cash equivalents at end of period	$ 161,758	$ 187,436