Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2021	Jun. 27, 2020
Cash flows from operating activities:
Net income	$ 183,980	$ 77,289
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	62,670	60,677
Amortization of right-of-use lease assets	28,031	29,467
Stock-based compensation	133,896	73,605
Other non-cash items, net	(1,108)	(2,786)
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	(4,110)	54,662
Accounts payable and accrued expenses	15,834	4,255
Accrued compensation and benefits	121	878
Deferred revenue	30,733	3,357
Income taxes	(13,524)	(44,445)
Other current assets and prepaid expenses	426	15,311
Operating lease liabilities	(13,106)	(8,871)
Other noncurrent assets and liabilities	(100,355)	(63,565)
Net cash provided by operating activities	323,488	199,834
Cash flows from investing activities:
Additions to property and equipment	(11,662)	(15,412)
Purchases of short- and long-term marketable securities	(7,562)	(26,087)
Proceeds from sales of short- and long-term marketable securities	56,170	1,521
Proceeds from maturities of short- and long-term marketable securities	9,861	24,271
Acquisitions of businesses, net of cash acquired	(717,779)	(468,520)
Purchase of intangible assets	(550)	(11,050)
Other investing activities	(3,291)	(1,729)
Net cash used in investing activities	(674,813)	(497,006)
Cash flows from financing activities:
Proceeds from issuance of Senior Notes	0	1,000,000
Borrowings under credit facility	600,000	455,000
Repayments of Senior Notes	0	(500,000)
Repayments of borrowings under credit facility	(128,000)	(490,125)
Proceeds from issuance of common stock	10,484	8,980
Debt issuance costs	0	(17,083)
Debt early redemption premium	0	(15,000)
Payments of withholding taxes in connection with stock-based awards	(42,215)	(33,232)
Payments of principal for financing leases	(279)	0
Net cash provided by financing activities	439,990	408,540
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1,646	(4,127)
Net change in cash, cash equivalents, and restricted cash	90,311	107,241
Cash, cash equivalents, and restricted cash, beginning of period	275,960	270,689
Cash, cash equivalents, and restricted cash, end of period	366,271	377,930
Supplemental disclosure of non-cash financing activities:
Withholding taxes in connection with stock-based awards, accrued	$ 9,979	$ 0