Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net Income (Loss)	$ 245,540	$ 313,081	$ 476,923
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	104,760	87,694	85,239
Amortization of right-of-use lease assets	32,402	34,346	37,295
Stock-based compensation	206,459	174,863	177,289
Loss (gain) on investment	0	31,854	(68,829)
Gain on divestiture of business	0	(29,808)	0
Other non-cash items, net	(4,065)	(4,560)	(1,381)
Provision (benefit) from deferred income taxes	16,676	42,963	(158,105)
Accounts receivable	(98,607)	(165,006)	(119,418)
Accounts payable and accrued expenses	15,918	6,957	25,096
Accrued compensation and benefits	7,845	(6,645)	16,775
Deferred revenue	56,572	57,586	58,702
Accrued income taxes	4,639	(15,329)	13,979
Other current assets and prepaid expenses	6,974	(40,643)	(14,206)
Operating lease liabilities	(1,929)	(13,610)	(7,129)
Other noncurrent assets and liabilities	17,677	(38,417)	(153,421)
Net cash provided by operating activities	610,861	435,326	368,809
Cash flows from investing activities:
Additions to property and equipment	(23,814)	(19,496)	(24,713)
Purchases of short- and long-term marketable securities	0	0	(7,562)
Proceeds from sales of short- and long-term marketable securities	0	0	56,170
Proceeds from maturities of short- and long-term marketable securities	0	0	9,861
Acquisitions of businesses, net of cash acquired	(828,271)	(282,943)	(718,030)
Proceeds from sale of investments	349	46,906	0
Purchases of investments	(5,823)	0	(4,000)
Purchase of intangible assets	(800)	(6,451)	(550)
Settlement of net investment hedges	(7,602)	24,857	965
Divestitures of businesses and assets, net	(154)	32,518	0
Other investing activities	0	3,408	0
Net cash used in investing activities	(866,115)	(201,201)	(687,859)
Cash flows from financing activities:
Borrowings under credit facility	1,540,000	264,000	600,000
Repayments of borrowings under credit facility	(1,197,000)	(355,000)	(168,000)
Repurchases of common stock	0	(125,000)	(30,000)
Proceeds from issuance of common stock	21,652	21,207	21,575
Payments of withholding taxes in connection with stock-based awards	(82,448)	(68,991)	(52,957)
Payments of principal for financing leases	(536)	(297)	(354)
Credit facility origination costs	(13,355)	0	0
Net cash provided by (used in) financing activities	268,313	(264,081)	370,264
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	2,851	(24,203)	(127)
Net change in cash, cash equivalents, and restricted cash	15,910	(54,159)	51,087
Cash, cash equivalents, and restricted cash, beginning of period	272,888	327,047	275,960
Cash, cash equivalents, and restricted cash, end of period	$ 288,798	$ 272,888	$ 327,047