Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jul. 29, 2017	Jul. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ (36,428)	$ 147,226
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Excess tax benefits from stock-based compensation	0	(1,778)
Depreciation and amortization	118,365	80,979
Loss on disposal of property and equipment	3,506	458
Loss on sold and held for sale software product lines	24,315	0
Net gain on sale of investments	0	(122)
Amortization of debt issuance costs and debt discount	15,571	13,493
Provision (recovery) for doubtful accounts receivable and sales allowances	8,914	(1,946)
Non-cash purchase accounting adjustments to inventory	5,853	20,775
Non-cash stock-based compensation expense	94,471	88,805
Impairment of equity investments	2,870	0
Changes in assets and liabilities, net of acquisitions and divestitures:
Accounts receivable	(16,558)	988
Inventories	(6,044)	5,601
Prepaid expenses and other assets	(16,029)	(9,725)
Deferred tax assets	63	(109)
Accounts payable	(27,370)	5,519
Accrued employee compensation	(56,803)	(57,520)
Deferred revenue	(20,900)	5,359
Other accrued liabilities	(48,799)	(43,874)
Restructuring liabilities	(365)	(1,223)
Net cash provided by operating activities	44,632	252,906
Cash flows from investing activities:
Purchases of non-marketable equity and debt investments	0	(2,000)
Proceeds from maturities and sale of short-term investments	0	150,323
Purchases of property and equipment	(28,618)	(59,810)
Net cash paid in connection with acquisitions	0	(564,888)
Proceeds from collection of note receivable	250	250
Net proceeds from sale of software product line	31,769	0
Net cash provided by (used in) investing activities	3,401	(476,125)
Cash flows from financing activities:
Payment of principal related to the term loan	(60,000)	0
Payment of debt issuance costs	0	(891)
Payment of principal related to capital leases	0	(282)
Payment of accrued merger consideration to dissenting stockholder of Ruckus Wireless, Inc.	(41,280)	0
Common stock repurchases	0	(841,562)
Proceeds from issuance of common stock	41,283	49,195
Payment of cash dividends to stockholders	(67,448)	(61,706)
Proceeds from term loan	0	787,255
Proceeds from noncontrolling interest	0	2,550
Excess tax benefits from stock-based compensation	0	1,778
Net cash used in financing activities	(127,445)	(63,663)
Effect of exchange rate fluctuations on cash and cash equivalents	1,706	(926)
Net decrease in cash and cash equivalents	(77,706)	(287,808)
Cash and cash equivalents, beginning of period	1,257,075	1,440,882
Cash and cash equivalents, end of period	1,179,369	1,153,074
Supplemental disclosures of cash flow information:
Cash paid for interest	36,454	24,264
Cash paid for income taxes	5,306	46,163
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Acquisition of a business by the issuance of stock and accrual for an appraisal demand submitted by a dissenting stockholder of that business	$ 0	$ 623,116