Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 313,081	$ 476,923	$ 130,695
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	87,694	85,239	80,817
Amortization of right-of-use lease assets	34,346	37,295	38,687
Stock-based compensation	174,863	177,289	115,149
Loss (gain) on investment	31,854	(68,829)	0
Gain on divestiture of business	(29,808)	0	0
Other non-cash items, net	(4,560)	(1,381)	(3,167)
Provision (benefit) from deferred income taxes	42,963	(158,105)	(24,641)
Accounts receivable	(165,006)	(119,418)	(32,365)
Accounts payable and accrued expenses	6,957	25,096	(5,135)
Accrued compensation and benefits	(6,645)	16,775	10,282
Deferred revenue	57,586	58,702	17,046
Income taxes	(15,329)	13,979	(26,616)
Other current assets and prepaid expenses	(40,643)	(14,206)	36,189
Operating lease liabilities	(13,610)	(7,129)	(11,110)
Other noncurrent assets and liabilities	(38,417)	(153,421)	(92,023)
Net cash provided by operating activities	435,326	368,809	233,808
Cash flows from investing activities:
Additions to property and equipment	(19,496)	(24,713)	(20,196)
Purchases of short- and long-term marketable securities	0	(7,562)	(33,869)
Proceeds from sales of short- and long-term marketable securities	0	56,170	1,521
Proceeds from maturities of short- and long-term marketable securities	0	9,861	30,521
Acquisitions of businesses, net of cash acquired	(282,943)	(718,030)	(483,478)
Proceeds from sales of investments	46,906	0	0
Purchases of investments	0	(4,000)	0
Purchase of intangible assets	(6,451)	(550)	(11,050)
Settlement of net investment hedges	24,857	965	(9,421)
Divestiture of business, net	32,518	0	0
Other investing activities	3,408	0	0
Net cash used in investing activities	(201,201)	(687,859)	(525,972)
Cash flows from financing activities:
Proceeds from issuance of Senior Notes	0	0	1,000,000
Borrowings under credit facility	264,000	600,000	455,000
Repayments of Senior Notes	0	0	(500,000)
Repayments of borrowings under credit facility	(355,000)	(168,000)	(610,125)
Repurchases of common stock	(125,000)	(30,000)	0
Proceeds from issuance of common stock	21,207	21,575	18,382
Debt issuance costs	0	0	(17,107)
Debt early redemption premium	0	0	(15,000)
Payments of withholding taxes in connection with stock-based awards	(68,991)	(52,957)	(33,740)
Payments of principal for financing leases	(297)	(354)	0
Net cash (used in) provided by financing activities	(264,081)	370,264	297,410
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(24,203)	(127)	25
Net change in cash, cash equivalents, and restricted cash	(54,159)	51,087	5,271
Cash, cash equivalents, and restricted cash, beginning of period	327,047	275,960	270,689
Cash, cash equivalents, and restricted cash, end of period	272,888	327,047	275,960
Supplemental disclosure of non-cash financing activities:
Withholding taxes in connection with stock-based awards, accrued	$ 0	$ 120	$ 0