Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Cash flows from operating activities:
Net income (loss)	$ 42,611	$ (22,528)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	40,193	39,558
Stock-based compensation	48,420	56,374
Other non-cash items, net	(1,926)	247
Loss on disposal of fixed assets	231	32
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	20,187	54,501
Accounts payable and accrued expenses	12,193	423
Accrued compensation and benefits	(4,629)	(28,291)
Deferred revenue	17,393	36,947
Accrued income taxes	(43,815)	(15,677)
Other current assets and prepaid expenses	681	1,723
Other noncurrent assets and liabilities	(36,210)	39,035
Net cash provided by operating activities	95,329	162,344
Cash flows from investing activities:
Additions to property and equipment	(10,243)	(51,268)
Purchases of short- and long-term marketable securities	(10,151)	(14,460)
Proceeds from maturities of short- and long-term marketable securities	9,971	14,227
Acquisitions of businesses, net of cash acquired	(468,520)	(69,453)
Purchases of investments	0	(7,500)
Settlement of net investment hedges	2,200	114
Net cash used in investing activities	(476,743)	(128,340)
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 borrowings under credit facility	(480,000)	(110,000)
Repurchases of common stock	0	(64,994)
Proceeds from issuance of common stock	8,980	4,158
Payments for debt issuance costs	(16,266)	0
Contingent consideration	0	(1,575)
Payments of withholding taxes in connection with stock-based awards	(23,571)	(34,491)
Net cash provided by (used in) financing activities	944,143	(1,902)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(5,740)	2,237
Net change in cash, cash equivalents, and restricted cash	556,989	34,339
Cash, cash equivalents, and restricted cash, beginning of period	270,689	261,093
Cash, cash equivalents, and restricted cash, end of period	$ 827,678	$ 295,432