Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 46,089	$ 23,515
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,088	18,835
Amortization of right-of-use lease assets	8,860	9,391
Stock-based compensation	45,942	46,088
Gain on investment	(9,766)	0
Other non-cash items, net	(273)	(331)
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	57,316	10,315
Accounts payable and accrued expenses	12,959	12,381
Accrued compensation and benefits	2,853	(9,252)
Deferred revenue	(13,696)	(851)
Accrued income taxes	(8,328)	44,537
Other current assets and prepaid expenses	(13,474)	4,288
Operating lease liabilities	(2,343)	(9,501)
Other noncurrent assets and liabilities	(10,491)	(35,653)
Net cash provided by operating activities	137,736	113,762
Cash flows from investing activities:
Additions to property and equipment	(3,362)	(2,857)
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
Purchases of investments	0	(1,000)
Purchase of intangible assets	(450)	(550)
Settlement of net investment hedges	6,473	(7,359)
Net cash provided by investing activities	2,661	46,703
Cash flows from financing activities:
Repayments of borrowings under credit facility	0	(18,000)
Repurchases of common stock	(119,739)	0
Payments of withholding taxes in connection with stock-based awards	(49,165)	(24,500)
Payments of principal for financing leases	(239)	(279)
Net cash used in financing activities	(169,143)	(42,779)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,661)	5,553
Net change in cash, cash equivalents, and restricted cash	(30,407)	123,239
Cash, cash equivalents, and restricted cash, beginning of period	327,046	275,960
Cash, cash equivalents, and restricted cash, end of period	296,639	399,199
Supplemental disclosure of non-cash financing activities:
Withholding taxes in connection with stock-based awards, accrued	0	(931)
Repurchases of common stock, accrued	$ (5,260)	$ 0