Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Cash flows from operating activities:
Net income (loss)	$ (29,065)	$ 35,676
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	42,904	42,205
Stock-based compensation	38,025	24,064
Excess tax benefits from stock-based awards	(56)	(163)
Other non-cash items, net	204	(1)
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	63,617	22,711
Accounts payable, accrued expenses and other current liabilities	(25,907)	(9,976)
Accrued compensation and benefits	8,215	(7,222)
Deferred revenue	24,019	32,200
Accrued and deferred income taxes	(8,826)	(16,565)
Other current assets and prepaid expenses	(1,882)	(4,942)
Other noncurrent assets and liabilities	(1,109)	(12,363)
Net cash provided by operating activities	110,139	105,624
Cash flows from investing activities:
Additions to property and equipment	(8,866)	(14,107)
Purchases of investments	0	(1,000)
Acquisitions of businesses, net of cash acquired	(164,191)	180
Net cash used by investing activities	(173,057)	(14,927)
Cash flows from financing activities:
Borrowings under credit facility	170,000	35,000
Repayments of borrowings under credit facility	0	(116,250)
Proceeds from issuance of common stock	1	6
Excess tax benefits from stock-based awards	56	163
Credit facility origination costs	(1,050)	0
Payments of withholding taxes in connection with vesting of stock-based awards	(15,471)	(21,864)
Net cash provided (used) by financing activities	152,286	(102,945)
Effect of exchange rate changes on cash and cash equivalents	5,671	(13,591)
Net increase (decrease) in cash and cash equivalents	95,039	(25,839)
Cash and cash equivalents, beginning of period	273,417	293,654
Cash and cash equivalents, end of period	368,456	267,815
Acquired entity name: ColdLight [Member]
Cash flows from financing activities:
Contingent consideration	$ (1,250)	$ 0