Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	6 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 197,849	$ 182,643
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	30,962	28,296
Amortization of lease right-of-use assets	21,517	20,510
Stock-based compensation expense	22,327	18,028
Deferred income taxes	(2,802)	(3,091)
Changes in assets and liabilities, net of effects of acquisitions
Accounts receivable, net of reserves	(15,421)	(21,835)
Accounts payable and accrued expenses	(724)	10,356
Accrued compensation	(20,879)	(23,518)
Deferred fees	12,445	10,775
Taxes payable, net of prepaid taxes	16,688	(12,182)
Lease liabilities, net	(20,549)	(13,924)
Other, net	(11,477)	(598)
Net cash provided by operating activities	229,936	195,460
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, equipment, leasehold improvements and internal-use software	(28,758)	(51,899)
Acquisition of business, net of cash and cash equivalents acquired	(41,916)	0
Purchases of investments	(1,250)	(2,236)
Proceeds from maturity or sale of investments	2,176	4,199
Net cash used in investing activities	(69,748)	(49,936)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchases of common stock	(114,640)	(158,595)
Dividend payments	(58,186)	(54,363)
Proceeds from employee stock plans	28,526	50,487
Other financing activities	(2,359)	(1,586)
Net cash used by financing activities	(146,659)	(164,057)
Effect of exchange rate changes on cash and cash equivalents	3,550	2,222
Net increase (decrease) in cash and cash equivalents	17,079	(16,311)
Cash and cash equivalents at beginning of period	585,605	359,799
Cash and cash equivalents at end of period	$ 602,684	$ 343,488