Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net Income (Loss)	$ 733,997	$ 376,333	$ 245,540
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	102,504	108,119	104,760
Amortization of right-of-use lease assets	32,912	33,288	32,402
Stock-based compensation	216,205	223,461	206,459
Other non-cash items, net	(3,516)	(1,625)	(4,065)
Provision (benefit) from deferred income taxes	(26,283)	(39,040)	16,676
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	(121,052)	(34,629)	(98,607)
Accounts payable and accrued expenses	(636)	(24,368)	15,918
Accrued compensation and benefits	20,526	8,404	7,845
Deferred revenue	37,753	81,399	56,572
Accrued income taxes	89,856	65,006	4,639
Other current assets and prepaid expenses	(8,458)	(16,137)	6,974
Operating lease liabilities	(10,345)	(13,245)	(1,929)
Other noncurrent assets and liabilities	(195,767)	(16,982)	17,677
Net cash provided by operating activities	867,696	749,984	610,861
Cash flows from investing activities:
Additions to property and equipment	(11,008)	(14,378)	(23,814)
Acquisitions of businesses, net of cash acquired	(6,532)	(93,457)	(828,271)
Settlement of net investment hedges	(20,753)	(13,078)	(7,602)
Other investing activities	0	(3,901)	(6,428)
Net cash used in investing activities	(38,293)	(124,814)	(866,115)
Cash flows from financing activities:
Borrowings under credit facility	860,000	1,084,845	1,540,000
Repayments of senior notes	(500,000)	0	0
Repayments of borrowings under credit facility and acquired debt	(912,958)	(1,038,921)	(1,197,000)
Repurchases of common stock	(299,998)	0	0
Proceeds from issuance of common stock	26,062	25,674	21,652
Payments of withholding taxes in connection with stock-based awards	(80,205)	(102,001)	(82,448)
Credit facility origination costs	(1,171)	0	(13,355)
Payment of deferred acquisition consideration	0	(620,040)	0
Other financing activity	(239)	(282)	(536)
Net cash provided by (used in) financing activities	(908,509)	(650,725)	268,313
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(2,372)	3,223	2,851
Net change in cash, cash equivalents, and restricted cash	(81,478)	(22,332)	15,910
Cash, cash equivalents, and restricted cash, beginning of period	266,466	288,798	272,888
Cash, cash equivalents, and restricted cash, end of period	$ 184,988	$ 266,466	$ 288,798