Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Aug. 31, 2020 USD ($)	Aug. 31, 2019 USD ($)	Aug. 31, 2018 USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 372,938	$ 352,790	$ 267,085
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	57,614	60,463	57,285
Amortization of lease right-of-use assets	43,185	0	0
Stock-based compensation expense	36,579	32,400	31,516
Deferred income taxes	10,626	(2,278)	(1,910)
Impairment charge	16,500	0	0
Loss on sale of assets	172	196	140
Changes in assets and liabilities, net of effects of acquisitions
Accounts receivable, net of reserves	(8,608)	10,205	(8,417)
Accounts payable and accrued expenses	12,427	(2,290)	12,077
Accrued compensation	16,446	(1,743)	5,735
Deferred fees	5,571	458	6,035
Taxes payable, net of prepaid taxes	(24,224)	(19,238)	27,659
Lease liabilities, net	(33,340)	0	0
Other, net	(46)	(3,827)	(11,537)
Net cash provided by operating activities	505,840	427,136	385,668
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, equipment, leasehold improvements and intangible assets	(77,642)	(59,370)	(33,520)
Purchases of investments	(2,736)	(11,135)	(12,470)
Proceeds from maturity or sale of investments	6,746	14,405	12,459
Acquisition of businesses and investments, net of cash and cash equivalents acquired	0	0	(15,000)
Net cash used in investing activities	(73,632)	(56,100)	(48,531)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of common stock	(199,625)	(220,372)	(303,955)
Dividend payments	(110,439)	(100,052)	(89,408)
Repayment of debt	0	(575,000)	0
Proceeds from debt	0	575,000	0
Proceeds from employee stock plans	95,520	107,051	71,610
Tax benefits from share-based payment arrangements	0	0	0
Other financing activities, net	(3,531)	(901)	1,716
Net cash used in financing activities	(218,075)	(214,274)	(320,037)
Effect of exchange rate changes on cash and cash equivalents	11,673	(5,586)	(3,208)
Net increase in cash and cash equivalents	225,806	151,176	13,892
Cash and cash equivalents at beginning of period	359,799	208,623	194,731
Cash and cash equivalents at end of period	585,605	359,799	208,623
Supplemental Disclosure of Cash Flow Information
Cash paid during the year for interest	12,876	19,509	15,676
Cash paid during the year for income taxes, net of refunds	69,092	89,997	68,707
Supplemental Disclosure of Non-Cash Transactions
Dividends declared, not paid	$ 29,283	$ 27,445	$ 24,443