Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 28, 2019
Cash flows from operating activities:
Net income	$ 23,515	$ 35,455
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,835	19,588
Amortization of right-of-use lease assets	9,391	8,757
Stock-based compensation	46,088	27,936
Other non-cash items, net	(331)	(1,223)
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	10,315	34,314
Accounts payable and accrued expenses	12,381	(11,959)
Accrued compensation and benefits	(9,252)	(3,563)
Deferred revenue	(851)	(34,952)
Accrued income taxes	44,537	(42,702)
Other current assets and prepaid expenses	4,288	(1,974)
Operating lease liabilities	(9,501)	(393)
Other noncurrent assets and liabilities	(35,653)	(21,772)
Net cash provided by operating activities	113,762	7,512
Cash flows from investing activities:
Additions to property and equipment	(2,857)	(4,707)
Purchases of short- and long-term marketable securities	(7,562)	(5,592)
Proceeds from sales of short- and long-term marketable securities	56,170	0
Proceeds from maturities of short- and long-term marketable securities	9,861	5,499
Acquisitions of businesses, net of cash acquired	0	(467,749)
Purchases of investments	(1,000)	0
Purchase of intangible assets	(550)	0
Settlement of net investment hedges	(7,359)	(870)
Net cash provided by (used in) investing activities	46,703	(473,419)
Cash flows from financing activities:
Borrowings under credit facility	0	455,000
Repayments of borrowings under credit facility	(18,000)	0
Debt issuance costs	0	(1,005)
Payments of withholding taxes in connection with stock-based awards	(24,500)	(22,849)
Payments on principal for financing leases	(279)	0
Net cash provided by (used in) financing activities	(42,779)	431,146
Effect of exchange rate changes on cash, cash equivalents and restricted cash	5,553	1,991
Net change in cash, cash equivalents, and restricted cash	123,239	(32,770)
Cash, cash equivalents, and restricted cash, beginning of period	275,960	270,689
Cash, cash equivalents, and restricted cash, end of period	399,199	237,919
Supplemental disclosure of non-cash financing activities:
Withholding taxes in connection with stock-based awards, accrued	$ (931)	$ 0