Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 135,768	$ 132,777
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	43,468	40,169
Amortization of right-of-use lease assets	17,536	18,956
Stock-based compensation	83,863	90,828
Loss on investment	34,847	0
Other non-cash items, net	(110)	(720)
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	12,310	(9,854)
Accounts payable and accrued expenses	(23,388)	6,142
Accrued compensation and benefits	(16,544)	(7,038)
Deferred revenue	47,012	52,210
Accrued income taxes	(6,279)	(4,944)
Other current assets and prepaid expenses	(20,569)	(17,049)
Operating lease liabilities	(3,360)	(9,982)
Other noncurrent assets and liabilities	(24,493)	(56,041)
Net cash provided by operating activities	280,061	235,454
Cash flows from investing activities:
Additions to property and equipment	(5,510)	(8,242)
Purchases of short- and long-term marketable securities	0	(7,562)
Proceeds from sales of short- and long-term marketable securities	0	56,170
Proceeds from maturities of short- and long-term marketable securities	0	9,861
Acquisitions of businesses, net of cash acquired	0	(717,198)
Proceeds from sale of investments	42,693	0
Purchases of investments	0	(1,000)
Purchase of intangible assets	(4,454)	(550)
Settlement of net investment hedges	11,308	(1,803)
Net cash provided by (used in) investing activities	44,037	(670,324)
Cash flows from financing activities:
Borrowings under credit facility	0	600,000
Repayments of borrowings under credit facility	(175,000)	(98,000)
Repurchases of common stock	(125,000)	0
Proceeds from issuance of common stock	10,857	10,484
Payments of withholding taxes in connection with stock-based awards	(50,595)	(27,242)
Payments of principal for financing leases	(239)	(279)
Net cash (used in) provided by financing activities	(339,977)	484,963
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(3,739)	543
Net change in cash, cash equivalents, and restricted cash	(19,618)	50,636
Cash, cash equivalents, and restricted cash, beginning of period	327,046	275,960
Cash, cash equivalents, and restricted cash, end of period	$ 307,428	$ 326,596