Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ (22,528)	$ 21,799
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	39,558	42,727
Stock-based compensation	56,374	35,357
Other non-cash items, net	247	189
Loss on disposal of fixed assets	32	22
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	54,501	32,027
Accounts payable and accrued expenses	423	(9,474)
Accrued compensation and benefits	(28,291)	(29,656)
Deferred revenue	36,947	59,027
Accrued income taxes	(15,677)	(14,134)
Other current assets and prepaid expenses	1,723	(7,217)
Other noncurrent assets and liabilities	39,035	5,931
Net cash provided by operating activities	162,344	136,598
Cash flows from investing activities:
Additions to property and equipment	(51,268)	(11,139)
Purchase of intangible asset	0	(3,000)
Purchases of short- and long-term marketable securities	(14,460)	(13,794)
Proceeds from maturities of short- and long-term marketable securities	14,227	8,240
Acquisitions of businesses, net of cash acquired	(69,453)	(3,000)
Purchases of investments	(7,500)	0
Settlement of net investment hedges	114	0
Net cash used in investing activities	(128,340)	(22,693)
Cash flows from financing activities:
Borrowings under credit facility	205,000	50,000
Repayments of borrowings under credit facility	(110,000)	(120,000)
Repurchases of common stock	(64,994)	0
Proceeds from issuance of common stock	4,158	7,472
Contingent consideration	(1,575)	(3,176)
Payments of withholding taxes in connection with stock-based awards	(34,491)	(33,942)
Net cash used in financing activities	(1,902)	(99,646)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,237	5,837
Net increase in cash, cash equivalents, and restricted cash	34,339	20,096
Cash, cash equivalents, and restricted cash, beginning of period	261,093	281,209
Cash, cash equivalents, and restricted cash, end of period	$ 295,432	$ 301,305