Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jul. 02, 2016	Jul. 04, 2015
Cash flows from operating activities:
Net income (loss)	$ (25,992)	$ 53,111
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	64,721	63,455
Stock-based compensation	51,821	38,135
Excess tax benefits from stock-based awards	(94)	71
Other non-cash items, net	246	(53)
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	58,499	44,906
Accounts payable, accrued expenses and other current liabilities	(17,303)	17,433
Accrued compensation and benefits	7,442	(27,462)
Deferred revenue	44,592	51,393
Accrued and deferred income taxes	(17,470)	(25,608)
Other current assets and prepaid expenses	4,249	(5,109)
Other noncurrent assets and liabilities	(1,115)	(17,809)
Net cash provided by operating activities	169,596	192,463
Cash flows from investing activities:
Additions to property and equipment	(16,632)	(20,637)
Purchases of investments	(44,605)	(11,000)
Acquisitions of businesses, net of cash acquired	(164,191)	(98,411)
Net cash used by investing activities	(225,428)	(130,048)
Cash flows from financing activities:
Borrowings	670,000	135,000
Repayments of borrowings under credit facility	(560,000)	(122,500)
Repurchases of common stock	0	(49,962)
Proceeds from issuance of common stock	19	38
Excess tax benefits from stock-based awards	94	(71)
Credit facility origination costs	(6,759)	0
Contingent consideration	(10,621)	0
Payments of withholding taxes in connection with vesting of stock-based awards	(20,636)	(29,117)
Net cash provided (used) by financing activities	72,097	(66,612)
Effect of exchange rate changes on cash and cash equivalents	4,944	(14,397)
Net increase (decrease) in cash and cash equivalents	21,209	(18,594)
Cash and cash equivalents, beginning of period	273,417	293,654
Cash and cash equivalents, end of period	$ 294,626	$ 275,060