Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities:
Net Income (Loss)	$ 757,241	$ 244,876
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	49,990	51,263
Amortization of right-of-use lease assets	17,728	16,165
Stock-based compensation	126,466	107,363
Gain on divestiture of businesses	(464,602)	0
Other non-cash items, net	(2,052)	1,903
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	135,414	127,972
Accounts payable and accrued expenses	81,706	(35,405)
Accrued compensation and benefits	(37,897)	(15,301)
Deferred revenue	(48,648)	34,532
Accrued income taxes	108,888	5,565
Other current assets and prepaid expenses	(145,805)	(7,735)
Operating lease liabilities	12,414	(2,596)
Other noncurrent assets and liabilities	(181)	(8,864)
Net cash provided by operating activities	590,662	519,738
Cash flows from investing activities:
Additions to property and equipment	(5,011)	(5,575)
Settlement of net investment hedges	16,706	12,260
Divestiture of businesses	523,306	0
Net cash provided by investing activities	535,001	6,685
Cash flows from financing activities:
Borrowings under credit facility	76,250	860,000
Repayments of Senior Notes	0	(500,000)
Repayments of borrowings under credit facility	(76,250)	(720,125)
Repurchases of common stock	(826,159)	(150,000)
Proceeds from issuance of common stock	13,162	13,307
Payments of withholding taxes in connection with stock-based awards	(52,816)	(52,871)
Other financing activity	(1,007)	(1,410)
Net cash used in financing activities	(866,820)	(551,099)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(4,146)	(6,048)
Net change in cash, cash equivalents, and restricted cash	254,697	(30,724)
Cash, cash equivalents, and restricted cash, beginning of period	184,988	266,466
Cash, cash equivalents, and restricted cash, end of period	439,685	235,742
Supplemental disclosure of non-cash financing and investing activities:
Operating right-of-use assets obtained in exchange for operating lease liabilities	$ 25,770	$ 11,294