Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ (37,286)	$ 38,796
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	58,634	65,303
Stock-based compensation	71,608	52,015
Other non-cash items, net	(2,721)	304
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	88,254	21,195
Accounts payable and accrued expenses	4,124	(16,539)
Accrued compensation and benefits	(23,442)	(22,348)
Deferred revenue	25,325	82,794
Accrued income taxes	(12,777)	(30,005)
Other current assets and prepaid expenses	(6,336)	(4,964)
Other noncurrent assets and liabilities	64,546	(759)
Net cash provided by operating activities	229,929	185,792
Cash flows from investing activities:
Additions to property and equipment	(59,579)	(18,666)
Purchase of intangible asset	0	(3,000)
Purchases of short- and long-term marketable securities	(18,950)	(18,063)
Proceeds from maturities of short- and long-term marketable securities	20,677	13,640
Acquisitions of businesses, net of cash acquired	(86,737)	(3,000)
Purchases of investments	(7,500)	(1,000)
Settlement of net investment hedges	4,509	0
Net cash used in investing activities	(147,580)	(30,089)
Cash flows from financing activities:
Borrowings under credit facility	205,000	200,000
Repayments of borrowings under credit facility	(150,000)	(220,000)
Repurchases of common stock	(89,995)	(100,000)
Proceeds from issuance of common stock	4,158	7,472
Contingent consideration	(1,575)	(7,750)
Payments of withholding taxes in connection with stock-based awards	(44,191)	(44,797)
Net cash used in financing activities	(76,603)	(165,075)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,143	(3,609)
Net increase in cash, cash equivalents, and restricted cash	7,889	(12,981)
Cash, cash equivalents, and restricted cash, beginning of period	261,093	281,209
Cash, cash equivalents, and restricted cash, end of period	$ 268,982	$ 268,228