Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Cash flows from operating activities:
Net income (loss)	$ 77,289	$ (37,286)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	60,677	58,634
Amortization of right-of-use lease assets	29,467	0
Stock-based compensation	73,605	71,608
Other non-cash items, net	(2,786)	(2,721)
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	54,662	88,254
Accounts payable and accrued expenses	4,255	4,124
Accrued compensation and benefits	878	(23,442)
Deferred revenue	3,357	25,325
Accrued income taxes	(44,445)	(12,777)
Other current assets and prepaid expenses	15,311	(6,336)
Operating lease liabilities	(8,871)	0
Other noncurrent assets and liabilities	(63,565)	64,546
Net cash provided by operating activities	199,834	229,929
Cash flows from investing activities:
Additions to property and equipment	(15,412)	(59,579)
Purchases of short- and long-term marketable securities	(26,087)	(18,950)
Proceeds from sales of short- and long-term marketable securities	1,521	0
Proceeds from maturities of short- and long-term marketable securities	24,271	20,677
Acquisitions of businesses, net of cash acquired	(468,520)	(86,737)
Purchases of investments	0	(7,500)
Purchase of intangible assets	(11,050)	0
Settlement of net investment hedges	(1,729)	4,509
Net cash used in investing activities	(497,006)	(147,580)
Cash flows from financing activities:
Proceeds from issuance of Senior Notes	1,000,000	0
Borrowings under credit facility	455,000	205,000
Repayments of Senior Notes	(500,000)	0
Repayments of borrowings under credit facility	(490,125)	(150,000)
Repurchases of common stock	0	(89,995)
Proceeds from issuance of common stock	8,980	4,158
Debt issuance costs	(17,083)	0
Contingent consideration	0	(1,575)
Debt early redemption premium	(15,000)	0
Payments of withholding taxes in connection with stock-based awards	(33,232)	(44,191)
Net cash provided by (used in) financing activities	408,540	(76,603)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(4,127)	2,143
Net change in cash, cash equivalents, and restricted cash	107,241	7,889
Cash, cash equivalents, and restricted cash, beginning of period	270,689	261,093
Cash, cash equivalents, and restricted cash, end of period	$ 377,930	$ 268,982