Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jul. 01, 2017	Jul. 02, 2016
Cash flows from operating activities:
Net income (loss)	$ (11,196)	$ (25,992)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	64,187	64,721
Stock-based compensation	56,139	51,821
Excess tax benefits from stock-based awards	(397)	(94)
Other non-cash items, net	1,536	246
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	34,913	58,499
Accounts payable, accrued expenses and other current liabilities	2,594	(17,303)
Accrued compensation and benefits	(50,518)	7,442
Deferred revenue	45,985	44,592
Accrued and deferred income taxes	(17,832)	(17,470)
Other current assets and prepaid expenses	(7,317)	4,249
Other noncurrent assets and liabilities	(16,028)	(1,115)
Net cash provided by operating activities	102,066	169,596
Cash flows from investing activities:
Additions to property and equipment	(19,333)	(16,632)
Purchases of short- and long-term marketable securities	(14,173)	(44,605)
Proceeds from maturities of short- and long-term marketable securities	13,440	0
Acquisitions of businesses, net of cash acquired	(4,960)	(164,191)
Proceeds from sales of investments	15,218	0
Net cash used in investing activities	(9,808)	(225,428)
Cash flows from financing activities:
Borrowings	150,000	670,000
Repayments of borrowings under credit facility	(190,000)	(560,000)
Payments for Repurchase of Common Stock	34,994	0
Proceeds from issuance of common stock	3,978	19
Excess tax benefits from stock-based awards	397	94
Credit facility origination costs	(184)	(6,759)
Contingent consideration	(11,054)	(10,621)
Payments of withholding taxes in connection with vesting of stock-based awards	(26,244)	(20,636)
Net cash provided by (used in) financing activities	(108,101)	72,097
Effect of exchange rate changes on cash and cash equivalents	(1,397)	4,944
Net increase (decrease) in cash and cash equivalents	(17,240)	21,209
Cash and cash equivalents, beginning of period	277,935	273,417
Cash and cash equivalents, end of period	$ 260,695	$ 294,626