Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net Income (Loss)	$ 244,876	$ 180,832
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	51,263	54,144
Amortization of right-of-use lease assets	16,165	15,459
Stock-based compensation	107,363	113,204
Other non-cash items, net	1,903	649
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	127,972	107,507
Accounts payable and accrued expenses	(35,405)	(48,345)
Accrued compensation and benefits	(15,301)	(16,451)
Deferred revenue	34,532	40,971
Accrued income taxes	5,565	18,087
Other current assets and prepaid expenses	(7,735)	(21,745)
Operating lease liabilities	(2,596)	(10,293)
Other noncurrent assets and liabilities	(8,864)	4,052
Net cash provided by operating activities	519,738	438,071
Cash flows from investing activities:
Additions to property and equipment	(5,575)	(8,202)
Acquisitions of businesses, net of cash acquired	0	(93,457)
Settlement of net investment hedges	12,260	(2,224)
Net cash provided by (used in) investing activities	6,685	(103,883)
Cash flows from financing activities:
Borrowings under credit facility	860,000	739,845
Repayments of Senior Notes	(500,000)	0
Repayments of borrowings under credit facility and acquired debt	(720,125)	(435,671)
Repurchases of common stock	(150,000)	0
Proceeds from issuance of common stock	13,307	12,709
Payments of withholding taxes in connection with stock-based awards	(52,871)	(71,184)
Payment of deferred acquisition consideration	0	(620,040)
Other financing activity	(1,410)	0
Net cash used in financing activities	(551,099)	(374,341)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(6,048)	829
Net change in cash, cash equivalents, and restricted cash	(30,724)	(39,324)
Cash, cash equivalents, and restricted cash, beginning of period	266,466	288,798
Cash, cash equivalents, and restricted cash, end of period	235,742	249,474
Supplemental disclosure of non-cash financing and investing activities:
Operating right-of-use assets obtained in exchange for operating lease liabilities	$ 11,294	$ 2,847