Ciena (CIEN) 10-Q 11 Mar 20 2020 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Jan. 31, 2020	Mar. 06, 2020
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jan. 31, 2020
Document Transition Report	false
Entity File Number	001-36250
Entity Registrant Name	Ciena Corp
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	23-2725311
Entity Address, Address Line One	7035 Ridge Road
Entity Address, City or Town	Hanover
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	21076
City Area Code	410
Local Phone Number	694-5700
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	CIEN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		153,503,455
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Central Index Key	0000936395
Current Fiscal Year End Date	--10-31

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Revenue:
Total revenue	$ 832,912	$ 778,527
Cost of goods sold:
Total cost of goods sold	462,377	455,186
Gross profit	370,535	323,341
Operating expenses:
Research and development	130,900	128,633
Selling and marketing	107,066	98,113
General and administrative	42,468	39,243
Amortization of intangible assets	5,853	5,528
Significant asset impairments and restructuring costs	4,472	2,273
Acquisition and integration costs	1,819	1,608
Total operating expenses	292,578	275,398
Income from operations	77,957	47,943
Interest and other income, net	3,646	4,253
Interest expense	(8,815)	(9,441)
Loss on extinguishment and modification of debt	(646)	0
Income before income taxes	72,142	42,755
Provision for income taxes	9,814	9,139
Net income	$ 62,328	$ 33,616
Basic net income (loss) per common share (in dollars per share)	$ 0.40	$ 0.22
Diluted net income (loss) per potential common share (in dollars per share)	$ 0.40	$ 0.21
Weighted average basic common shares outstanding (in shares)	154,334	156,314
Weighted average dilutive potential common shares outstanding (in shares)	155,738	158,174
Products
Revenue:
Total revenue	$ 687,215	$ 642,532
Cost of goods sold:
Total cost of goods sold	389,013	380,442
Services
Revenue:
Total revenue	145,697	135,995
Cost of goods sold:
Total cost of goods sold	$ 73,364	$ 74,744

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Net income	$ 62,328	$ 33,616
Change in unrealized gain (loss) on available-for-sale securities, net of tax	(86)	301
Change in cumulative translation adjustments	(2,982)	1,150
Other comprehensive loss	(5,627)	(4,860)
Total comprehensive income	56,701	28,756
Change in unrealized gain (loss) on foreign currency forward contracts, net of tax
Change in unrealized gain (loss) on foreign currency forward contracts and forward starting interest rate swaps, net of tax	(1,079)	1,560
Change in unrealized loss on forward starting interest rate swaps, net of tax
Change in unrealized gain (loss) on foreign currency forward contracts and forward starting interest rate swaps, net of tax	$ (1,480)	$ (7,871)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jan. 31, 2020	Oct. 31, 2019
Current assets:
Cash and cash equivalents	$ 837,286	$ 904,045
Short-term investments	110,067	109,940
Accounts receivable, net of allowance for doubtful accounts of $22.3 million and $20.1 million as of January 31, 2020 and October 31, 2019, respectively.	655,105	724,854
Inventories, net	342,673	345,049
Prepaid expenses and other	321,313	297,914
Total current assets	2,266,444	2,381,802
Long-term investments	10,076	10,014
Equipment, building, furniture and fixtures, net		286,884
Equipment, building, furniture and fixtures, net	277,739
Operating right-of-use assets	50,148
Goodwill	310,913	297,937
Other intangible assets, net	125,640	112,781
Deferred tax asset, net	699,439	714,942
Other long-term assets	90,488	88,986
Total assets	3,830,887	3,893,346
Current liabilities:
Accounts payable	311,748	344,819
Accrued liabilities and other short-term obligations	273,305	382,740
Deferred revenue	122,410	111,381
Operating lease liabilities	18,623
Current portion of long-term debt	7,000	7,000
Total current liabilities	733,086	845,940
Long-term deferred revenue	44,425	45,492
Other long-term obligations	125,607	148,747
Long-term operating lease liabilities	53,333
Long-term debt, net	680,786	680,406
Total liabilities	1,637,237	1,720,585
Commitments and contingencies (Note 21)
Stockholders’ equity:
Preferred stock – par value $0.01; 20,000,000 shares authorized; zero shares issued and outstanding	0	0
Common stock – par value $0.01; 290,000,000 shares authorized; 153,946,833 and 154,403,850 shares issued and outstanding	1,539	1,544
Additional paid-in capital	6,801,907	6,837,714
Accumulated other comprehensive loss	(27,711)	(22,084)
Accumulated deficit	(4,582,085)	(4,644,413)
Total stockholders’ equity	2,193,650	2,172,761
Total liabilities and stockholders’ equity	$ 3,830,887	$ 3,893,346

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jan. 31, 2020	Oct. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 22.3	$ 20.1
Stockholders’ equity:
Preferred stock par value per share (in dollars per share)	$ 0.1	$ 0.01
Preferred stock shares authorized (in shares)	20,000,000	20,000,000
Preferred stock shares issued (in shares)	0	0
Preferred stock shares outstanding (in shares)	0	0
Common stock par value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock shares authorized (in shares)	290,000,000	290,000,000
Common stock shares issued (in shares)	153,946,833	154,403,850
Common stock shares outstanding (in shares)	153,946,833	154,403,850

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Cash flows provided by (used in) operating activities:
Net income	$ 62,328	$ 33,616
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation of equipment, building, furniture and fixtures, and amortization of leasehold improvements	25,782	21,513
Share-based compensation costs	15,602	13,755
Amortization of intangible assets	9,687	8,947
Deferred taxes	10,788	5,037
Provision for inventory excess and obsolescence	6,699	4,673
Provision for warranty	7,898	3,891
Other	4,540	3,356
Changes in assets and liabilities:
Accounts receivable	64,938	38,544
Inventories	(4,481)	(67,555)
Prepaid expenses and other	(29,792)	1,133
Operating lease right-of-use assets	4,176
Accounts payable, accruals and other obligations	(142,229)	(76,351)
Deferred revenue	8,926	(4,664)
Short and long-term operating lease liabilities	(5,098)
Net cash provided by (used in) operating activities	39,764	(14,105)
Cash flows provided by (used in) investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(26,820)	(15,345)
Purchase of available for sale securities	(29,733)	(68,516)
Proceeds from maturities of available for sale securities	30,000	60,000
Proceeds from sales of available for sale securities	0	98,265
Settlement of foreign currency forward contracts, net	(73)	(4,650)
Acquisition of business, net of cash acquired	(28,300)	0
Purchase of equity investment	0	(333)
Net cash provided by (used in) investing activities	(54,926)	69,421
Cash flows used in financing activities:
Payment of long-term debt	0	(1,750)
Payment of debt issuance costs	(382)	0
Payment of finance lease obligations	(722)
Payment of finance lease obligations		(758)
Payment for debt conversion liability	0	(111,268)
Shares repurchased for tax withholdings on vesting of stock unit awards	(12,572)	(10,026)
Repurchases of common stock - repurchase program	(49,203)	(19,721)
Proceeds from issuance of common stock	11,862	10,899
Net cash used in financing activities	(51,017)	(132,624)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(643)	695
Net decrease in cash, cash equivalents and restricted cash	(66,822)	(76,613)
Cash, cash equivalents and restricted cash at beginning of period	904,161	745,423
Cash, cash equivalents and restricted cash at end of period	837,339	668,810
Supplemental disclosure of cash flow information
Cash paid during the period for interest	9,325	10,007
Cash paid during the period for income taxes, net	8,325	3,402
Operating lease payments	5,642
Non-cash investing and financing activities
Purchase of equipment in accounts payable	5,905	5,471
Repurchase of common stock in accrued liabilities from repurchase program	1,501	1,441
Conversion of debt conversion liability into 1,585,140 shares of common stock	0	$ 52,944
Operating lease right-of-use assets subject to lease liability	$ 1,157

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Parenthetical)	3 Months Ended
	Jan. 31, 2019shares
Statement of Cash Flows [Abstract]
Conversion of debt conversion liability into 1,585,140 shares of common stock (in shares)	1,585,140

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Changes in Stockholders’ Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Oct. 31, 2018		154,318,531
Beginning balance at Oct. 31, 2018	$ 1,929,334	$ 1,543	$ 6,881,223	$ (5,780)	$ (4,947,652)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,616				33,616
Other comprehensive income (loss)	(4,860)			(4,860)
Repurchase of common stock - repurchase program (in shares)		(591,897)
Repurchase of common stock - repurchase program	(21,162)	$ (6)	(21,156)
Issuance of shares from employee equity plans (in shares)		1,329,352
Issuance of shares from employee equity plans	10,899	$ 13	10,886
Share-based compensation expense	13,755		13,755
Settlement of debt conversion liability (in shares)		1,585,140
Settlement of debt conversion liability	52,944	$ 16	52,928
Shares repurchased for tax withholdings on vesting of stock unit awards (in shares)		(304,916)
Shares repurchased for tax withholdings on vesting of stock unit awards	(10,026)	$ (3)	(10,023)
Ending balance (in shares) at Jan. 31, 2019		156,336,210
Ending balance at Jan. 31, 2019	$ 2,054,305	$ 1,563	6,927,613	(10,640)	(4,864,231)
Beginning balance (in shares) at Oct. 31, 2019	154,403,850	154,403,850
Beginning balance at Oct. 31, 2019	$ 2,172,761	$ 1,544	6,837,714	(22,084)	(4,644,413)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	62,328				62,328
Other comprehensive income (loss)	(5,627)			(5,627)
Repurchase of common stock - repurchase program (in shares)		(1,288,111)
Repurchase of common stock - repurchase program	(50,704)	$ (13)	(50,691)
Issuance of shares from employee equity plans (in shares)		1,128,096
Issuance of shares from employee equity plans	11,862	$ 11	11,851
Share-based compensation expense	15,602		15,602
Shares repurchased for tax withholdings on vesting of stock unit awards (in shares)		(297,002)
Shares repurchased for tax withholdings on vesting of stock unit awards	$ (12,572)	$ (3)	(12,569)
Ending balance (in shares) at Jan. 31, 2020	153,946,833	153,946,833
Ending balance at Jan. 31, 2020	$ 2,193,650	$ 1,539	$ 6,801,907	$ (27,711)	$ (4,582,085)

Interim Financial Statements

Interim Financial Statements	3 Months Ended
	Jan. 31, 2020
Quarterly Financial Data [Abstract]
Interim Financial Statements	INTERIM FINANCIAL STATEMENTS The interim financial statements included herein for Ciena Corporation and its wholly owned subsidiaries (“Ciena”) have been prepared by Ciena, without audit, pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”). In the opinion of management, the financial statements included in this report reflect all normal recurring adjustments that Ciena considers necessary for the fair statement of the results of operations of Ciena for the interim periods covered and of the financial position of Ciena at the date of the interim balance sheets. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to SEC rules and regulations. The Condensed Consolidated Balance Sheet as of October 31, 2019 was derived from audited financial statements, but does not include all disclosures required by GAAP. However, Ciena believes that the disclosures are adequate to understand the information presented herein. The operating results for interim periods are not necessarily indicative of the operating results for the entire year. These financial statements should be read in conjunction with Ciena’s audited consolidated financial statements and the notes thereto included in Ciena’s annual report on Form 10-K for the fiscal year ended October 31, 2019 . Ciena has a 52 or 53-week fiscal year, with quarters ending on the Saturday nearest to the last day of January, April, July and October, respectively, of each year. Fiscal 2020 and 2019

Significant Accounting Policies

Significant Accounting Policies	3 Months Ended
	Jan. 31, 2020
Accounting Policies [Abstract]
Significant Accounting Policies	SIGNIFICANT ACCOUNTING POLICIES Except for the changes in certain policies described below, there have been no material changes to Ciena’s significant accounting policies, compared to the accounting policies described in Note 1 , Ciena Corporation and Significant Accounting Policies and Estimates, in Notes to Consolidated Financial Statements in Item 8 of Part II of the 2019 Annual Report. Newly Issued Accounting Standards - Effective Leases In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Codification ASC 842 , Leases , which requires an entity to recognize assets and liabilities on the balance sheet for the rights and obligations created by leased assets and to provide additional disclosures. Effective November 1, 2019 , Ciena adopted ASC 842 which requires right-of-use ("ROU") assets and lease liabilities to be recorded on the balance sheet for leases. The guidance specifies that at the inception of a contract, an entity must determine whether the contract is or contains a lease. The contract is or contains a lease if the contract conveys the right to control the use of the property, plant, or equipment for a designated term in exchange for consideration. Ciena’s evaluation of its contracts followed the assessment of whether there was a right to obtain substantially all of the economic benefits from the use and the right to direct the use of the identified asset in the contract. Operating leases are included in the Operating right-of-use assets (“Operating ROU assets”), Operating lease liabilities and Long-term operating lease liabilities in the Condensed Consolidated Balance Sheets. Finance leases are included in Equipment, building, furniture and fixtures, net (“Finance ROU assets”), Accrued liabilities and other short-term obligations and Other long-term obligations are included in the Condensed Consolidated Balance Sheets. Ciena adopted the guidance on a modified retrospective basis as of November 1, 2019 , such that related amounts in prior periods have not been restated. Ciena has operating and finance leases that primarily relate to real property. As a practical expedient, Ciena has elected the “package of practical expedients” and, as a result, did not reassess existing lease identifications, lease classifications or initial direct costs. As a practical expedient, Ciena has elected not to capitalize leases with a term of 12 months or less without a purchase option that it is likely to exercise. Also as a practical expedient for disclosure, Ciena has elected not to separate lease and non-lease components on operating and finance leases. Lease components are payment items directly attributable to the use of the underlying asset, while non-lease components are explicit elements of a contract not directly related to the use of the underlying asset, including pass through operating expenses like common area maintenance and utilities. Operating ROU assets and lease liabilities and Finance ROU assets and lease liabilities are recognized on the Condensed Consolidated Balance Sheets at the present value of the future lease payments over the life of the lease term. Ciena uses discount rates based on incremental borrowing rates, on a collateralized basis, for the respective underlying assets, for terms similar to the respective leases when implicit rates for leases are not determinable. Operating lease costs are included as rent expense in the Condensed Consolidated Statements of Operations. Fixed base payments on operating leases paid directly to the lessor are recorded as lease expense on a straight-line basis. Related variable payments based on usage, changes in an index, or market rate are expensed as incurred. Finance ROU assets are generally amortized on a straight line basis over the lease term with the interest expense on the lease liability recorded using the interest method. The amortization and interest expense are recorded separately in the Condensed Consolidated Statements of Operations. Upon adoption, Ciena recorded Operating ROU assets of $53.3 million and lease liabilities of $76.0 million related to its operating leases. As of October 31, 2019 , the restructuring reserve liability for vacated office space of $11.1 million was included in Accrued liabilities and other short-term obligations and Other long-term obligations on the Condensed Consolidated Balance Sheet under prior accounting guidance. Upon adoption of the updated guidance, the existing lease reserve liability was reclassified as a reduction to the Operating ROU assets. ROU assets will be tested for impairment when circumstances indicate that the carrying values may not be recoverable. The adoption of this guidance did not require a cumulative effect adjustment or have an impact on the Condensed Consolidated Statements of Income or Condensed Consolidated Statements of Cash Flows. Opening Balance Adjustments The following table summarizes the cumulative effect of the changes made to Ciena’s Condensed Consolidated Balance Sheet in connection with the adoption of ASC 842 (in millions): Balance at October 31, 2019 New Lease Accounting Standard Adjusted Balance at November 1, 2019 ASSETS: Operating right-of-use assets $ — $ 53,334 (1) $ 53,334 Total assets $ 3,893,346 $ 53,334 $ 3,946,680 LIABILITIES AND STOCKHOLDERS’ EQUITY: Accrued liabilities and other short-term obligations $ 382,740 $ (1,484 ) (2) $ 381,256 Short-term lease liabilities $ — 20,498 (3) $ 20,498 Other long-term obligations $ 148,747 (21,244 ) (4) $ 127,503 Long-term operating lease liabilities $ — 55,564 (5) $ 55,564 Total liabilities and stockholders equity $ 3,893,346 $ 53,334 $ 3,946,680 (1) Represents $76.0 million of operating leases recognized as Operating ROU assets upon adoption of ASC 842, less $5.4 million of deferred rent, $6.2 million of tenant improvement allowances, $1.5 million of short-term restructuring reserve liability and $9.6 million of long-term restructuring reserve liability all recognized as a reduction to Right-of-use assets. (2) Represents $1.5 million of short-term restructuring reserve liability recognized as a reduction to Operating ROU assets. (3) Represents $20.5 million of lease liabilities for operating leases. (4) Represents $9.6 million of long-term restructuring reserve liability, $5.4 million of deferred rent, and $6.2 million of tenant improvement allowances recognized as a reduction to Right-of-use assets. (5) Represents $55.6 million of lease liabilities for operating leases. See Note 15 for additional information. Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-13 ( “ASU 2018-13” ), Fair Value Measurement (Topic 820): Disclosure Framework which modifies the disclosure requirements on fair value measurements. Ciena adopted ASU 2018-13 beginning the first quarter of fiscal year 2020. Adoption of ASU 2018-13 did not have a material effect on Ciena’s financial position or results of operations. Newly Issued Accounting Standards - Not Yet Effective In June 2016, the FASB issued ASU No. 2016-13 ( “ASU 2016-13” ), Financial Instruments - Credit Losses, which requires measurement and recognition of expected credit losses for financial assets held based on historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. ASU 2016-13 is effective for Ciena beginning in the first quarter of fiscal 2021, and early adoption is permitted. Ciena is currently evaluating the impact of this accounting standard update on its Consolidated Financial Statements and related disclosures.

Revenue

Revenue	3 Months Ended
	Jan. 31, 2020
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE Disaggregation of Revenue Ciena’s disaggregated revenue represents similar groups that depict the nature, amount, and timing of revenue and cash flows for Ciena’s various offerings. The sales cycle, contractual obligations, customer requirements, and go-to-market strategies may differ for each of its product categories, resulting in different economic risk profiles for each category. The tables below (in thousands) set forth Ciena’s disaggregated revenue for the respective period: Quarter Ended January 31, 2020 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 591,549 $ — $ — $ — $ 591,549 Packet Networking 67,508 — — — 67,508 Platform Software and Services — 51,888 — — 51,888 Blue Planet Automation Software and Services — — 15,466 — 15,466 Maintenance Support and Training — — — 61,793 61,793 Installation and Deployment — — — 34,954 34,954 Consulting and Network Design — — — 9,754 9,754 Total revenue by product line $ 659,057 $ 51,888 $ 15,466 $ 106,501 $ 832,912 Timing of revenue recognition: Products and services at a point in time $ 659,057 $ 13,114 $ 3,736 $ 4,197 $ 680,104 Services transferred over time — 38,774 11,730 102,304 152,808 Total revenue by timing of revenue recognition $ 659,057 $ 51,888 $ 15,466 $ 106,501 $ 832,912 Quarter Ended January 31, 2019 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 548,997 $ — $ — $ — $ 548,997 Packet Networking 71,569 — — — 71,569 Platform Software and Services — 41,598 — — 41,598 Blue Planet Automation Software and Services — — 14,974 — 14,974 Maintenance Support and Training — — — 61,277 61,277 Installation and Deployment — — — 30,622 30,622 Consulting and Network Design — — — 9,490 9,490 Total revenue by product line $ 620,566 $ 41,598 $ 14,974 $ 101,389 $ 778,527 Timing of revenue recognition: Products and services at a point in time $ 620,566 $ 16,044 $ 6,228 $ 3,566 $ 646,404 Services transferred over time — 25,554 8,746 97,823 132,123 Total revenue by timing of revenue recognition $ 620,566 $ 41,598 $ 14,974 $ 101,389 $ 778,527 Effective the beginning of fiscal 2020, Ciena’s Global Sales and Marketing organization combined its previous North America and Caribbean and Latin America (“CALA”) regions into a new “Americas” sales region. Accordingly, Ciena reflects its sales geographically around the following markets: (i) Americas; (ii) Europe, Middle East and Africa (“EMEA”); and (iii) Asia Pacific, Japan and India (“APAC”). Within each geographic area, we maintain specific teams or personnel that focus on a particular region, country, customer or market vertical. These teams include sales management, account salespersons and sales engineers, as well as services professionals and commercial management personnel, who ensure that we maintain a high-touch, consultative relationship with our customers. For the periods below, Ciena’s geographic distribution of revenue was as follows (in thousands): Quarter Ended January 31, 2020 2019 Geographic distribution: Americas $ 574,004 $ 516,481 EMEA 129,965 129,190 APAC 128,943 132,856 Total revenue by geographic distribution $ 832,912 $ 778,527 • Networking Platforms reflects sales of Ciena’s Converged Packet Optical and Packet Networking product lines . • Converged Packet Optical - includes the 6500 Packet-Optical Platform, 5430 Reconfigurable Switching System, Waveserver® stackable interconnect system (“Waveserver”), the family of CoreDirector® Multiservice Optical Switches and the OTN configuration for the 5410 Reconfigurable Switching System. This product line also includes sales of the Z-Series Packet-Optical Platform. • Packet Networking - includes the 3000 family of service delivery switches and service aggregation switches and the 5000 family of service aggregation switches. This product line also includes the 8700 Packetwave Platform, the Ethernet packet configuration for the 5410 Service Aggregation Switch, and the 6500 Packet Transport System (PTS), which combines packet switching, control plane operation, and integrated optics. The Networking Platforms segment also includes sales of operating system software and enhanced software features embedded in each of the product lines above. Revenue from this segment is included in product revenue on the Condensed Consolidated Statements of Operations. Operating system software and enhanced software features embedded in Ciena hardware are each considered distinct performance obligations for which the revenue is generally recognized upfront at a point in time upon transfer of control. • Platform Software and Services provides analytics, data, and planning tools to assist customers in managing Ciena’s Networking Platforms products in their networks. Ciena’s platform software includes its Manage, Control and Plan (MCP) domain controller solution, OneControl Unified Management System, ON-Center® Network and Service Management Suite, Ethernet Services Manager, Optical Suite Release and Planet Operate. Platform software-related services revenue includes sales of subscription, installation, support, and consulting services related to Ciena’s software platforms, operating system software and enhanced software features embedded in each of the Networking Platforms product lines above. Revenue from the software portion of this segment is included in product revenue on the Condensed Consolidated Statements of Operations. Revenue from services portions of this segment is included in services revenue on the Condensed Consolidated Statements of Operations. • Blue Planet® Automation Software and Services is a comprehensive, open software suite, together with related services, that allows customers to use enhanced knowledge about their networks to drive adaptive optimization of their services and operations. Ciena’s Blue Planet Automation Platform includes multi-domain service orchestration (MDSO), network function virtualization (NFV), management and orchestration (NFV MANO), analytics, network health predictor (NHP), route optimization and assurance (ROA), inventory management, unified assurance and analytics (UAA) and Ciena’s SDN Multilayer Controller and virtual wide area network (V-WAN) application. Services revenue includes sales of subscription, installation, support, consulting and design services related to Ciena’s Blue Planet Automation Platform. Revenue from the software portion of this segment is included in product revenue on the Condensed Consolidated Statements of Operations. Revenue from services portions of this segment is included in services revenue on the Condensed Consolidated Statements of Operations. Ciena’s software platform revenue typically reflects sales of either perpetual or term-based software licenses, and these sales are considered a distinct performance obligation where revenue is generally recognized upfront at a point in time upon transfer of control. Revenue from software subscription and support are recognized ratably over the period during which the services are performed. Revenue from professional services for solution customization, software and solution support services, consulting and design, and build-operate-transfer services relating to Ciena’s software offerings are recognized over time with Ciena applying the input method to determine the amount of revenue to be recognized in a given period. • Global Services reflects sales of a broad range of Ciena’s services for maintenance support and training, installation and deployment, and consulting and network design activities. Revenue from this segment is included in services revenue on the Condensed Consolidated Statements of Operations. Ciena’s Global Services are considered a distinct performance obligation where revenue is generally recognized over time. Revenue from maintenance support is recognized ratably over the period during which the services are performed. Revenue from installation and deployment services and consulting and network design services are recognized over time with Ciena applying the input method to determine the amount of revenue to be recognized in a given period. Revenue from training services is generally recognized at a point in time upon completion of the service. Contract Balances The following table provides information about receivables, contract assets and contract liabilities (deferred revenue) from contracts with customers (in thousands): Balance at January 31, 2020 Balance at October 31, 2019 Accounts receivable, net $ 655,105 $ 724,854 Contract assets $ 83,717 $ 84,046 Deferred revenue $ 166,835 $ 156,873 Our contract assets represent unbilled accounts receivable where transfer of a product or service has occurred but invoicing is conditional upon completion of future performance obligations. These amounts are primarily related to installation and deployment and professional services arrangements where transfer of control has occurred, but Ciena has not yet invoiced the customer. Contract assets are included in prepaid expenses and other current assets in the Condensed Consolidated Balance Sheets. See Note 11 for further discussion. Contract liabilities consist of deferred revenue and represent advanced payments against non-cancelable customer orders received prior to revenue recognition. Ciena recognized approximately $49.0 million and $39.4 million of revenue during the first three months of fiscal 2020 and 2019 that was included in the deferred revenue balance at October 31, 2019 and November 1, 2018 , respectively. Revenue recognized due to changes in transaction price from performance obligations satisfied or partially satisfied in previous periods was immaterial during the three months ended January 31, 2020 and 2019 . Capitalized Contract Acquisition Costs Capitalized contract acquisition costs consist of deferred sales commissions, and were $13.1 million and $15.7 million as of January 31, 2020 and October 31, 2019 , respectively, and were included in other current assets and other assets. The amortization expense associated with these costs was $5.6 million and $4.1 million during the first three months of fiscal 2020 and 2019 , respectively, and was included in sales and marketing expense. Remaining Performance Obligations Remaining Performance Obligations (RPO) are comprised of non-cancelable customer purchase orders for products and services that are awaiting transfer of control for revenue recognition under the applicable contract terms. As of January 31, 2020 , the aggregate amount of RPO was $905 million . As of January 31, 2020 , Ciena expects approximately 82% of the RPO to be recognized as revenue within the next twelve months .

Business Combinations

Business Combinations	3 Months Ended
	Jan. 31, 2020
Business Combinations [Abstract]
Business Combinations	BUSINESS COMBINATIONS Centina Systems, Inc. Acquisition On November 2, 2019 Ciena acquired Centina Systems, Inc. (“Centina”), a provider of service assurance analytics and network performance management solutions, for approximately $34.0 million in cash. This transaction has been accounted for as the acquisition of a business. During the first quarter of fiscal 2020, Ciena incurred approximately $0.5 million of acquisition-related costs associated with this transaction. These costs primarily reflect fees associated with financial, legal and accounting advisors. The following table summarizes the final purchase price allocation related to the acquisition based on the estimated fair value of the acquired assets and assumed liabilities (in thousands): Amount Cash and cash equivalents $ 5,718 Accounts receivable 610 Prepaid expenses and other 536 Equipment, furniture and fixtures 17 Goodwill 13,055 Customer relationships and contracts 400 Developed technology 22,200 Accounts payable (47 ) Accrued liabilities (286 ) Deferred revenue (1,493 ) Deferred tax liability (6,692 ) Total purchase consideration $ 34,018 Customer relationships and contracts represent agreements with existing Centina customers and have an estimated useful life of two years . Developed technology represents purchased technology that has reached technological feasibility and for which Centina had substantially completed development as of the date of acquisition. Fair value was determined using future discounted cash flows related to the projected income stream of the developed technology for a discrete projection period. Cash flows were discounted to their present value as of the closing date. Developed technology is amortized on a straight-line basis over its estimated useful life of five years . The goodwill generated from the acquisition of Centina is primarily related to expected synergies. The total goodwill amount was recorded in the Blue Planet Automation Software and Services segment. The goodwill is not deductible for income tax purposes. Pro forma disclosures have not been included due to immateriality.

Restructuring Costs

Restructuring Costs	3 Months Ended
	Jan. 31, 2020
Restructuring and Related Activities [Abstract]
Restructuring Costs	RESTRUCTURING COSTS Ciena has undertaken a number of restructuring activities intended to reduce expense and to better align its workforce and costs with market opportunities, product development and business strategies. The following table sets forth the restructuring activity and balance of the restructuring liability accounts, which are included in Accrued liabilities and other short-term obligations on our Condensed Consolidated Balance Sheets, for the three months ended January 31, 2020 (in thousands): Workforce reduction Consolidation of excess facilities and other restructuring activities Total Balance at October 31, 2019 $ 3,983 $ 11,160 $ 15,143 Charges 1,204 (1) 3,268 (2) 4,472 Adjustments related to ASC 842 — (11,160 ) (3) (11,160 ) Cash payments (2,955 ) (3,268 ) (6,223 ) Balance at January 31, 2020 $ 2,232 $ — $ 2,232 Current restructuring liabilities $ 2,232 $ — $ 2,232 Non-current restructuring liabilities $ — $ — $ — (1) Reflects a global workforce reduction of approximately 22 employees during the three months ended January 31, 2020 as part of a business optimization strategy to improve gross margin, constrain operating expense and redesign certain business processes. (2) Primarily represents variable costs and imputed interest expense related to restructured facilities (3) Represents restructuring reserve liability recognized as a reduction to Operating right-of-use assets, net in relation to adoption of ASC 842. See Notes 2 and 15 for further discussion. The following table sets forth the restructuring activity and balance of the restructuring liability accounts, which are included in Accrued liabilities and other short-term obligations on our Condensed Consolidated Balance Sheets for the three months ended January 31, 2019 (in thousands): Workforce reduction Consolidation of excess facilities Total Balance at October 31, 2018 $ 2,108 $ 1,739 $ 3,847 Charges 1,752 (1) 521 (2) 2,273 Cash payments (3,009 ) (548 ) (3,557 ) Balance at January 31, 2019 $ 851 $ 1,712 $ 2,563 Current restructuring liabilities $ 851 $ 525 $ 1,376 Non-current restructuring liabilities $ — $ 1,187 $ 1,187 (1) Reflects a global workforce reduction of approximately 10 employees during the three months ended January 31, 2019 as part of a business optimization strategy to improve gross margin, constrain operating expense and redesign certain business processes. (2)

Interest and Other Income, Net

Interest and Other Income, Net	3 Months Ended
	Jan. 31, 2020
Other Income and Expenses [Abstract]
Interest and Other Income, Net	INTEREST AND OTHER INCOME, NET The components of interest and other income, net, are as follows (in thousands): Quarter Ended January 31, 2020 2019 Interest income $ 3,390 $ 3,872 Gains on non-hedge designated foreign currency forward contracts 637 22 Foreign currency exchange gains (losses) (771 ) 783 Other 390 (424 ) Interest and other income, net $ 3,646 $ 4,253 Ciena Corporation, as the U.S. parent entity, uses the U.S. Dollar as its functional currency; however, some of its foreign branch offices and subsidiaries use local currencies as their functional currencies. Ciena recorded $0.8 million in foreign currency exchange rate losses during the first three months of fiscal 2020 and $0.8 million in foreign currency exchange rate gains during the first three months of fiscal 2019 , as a result of monetary assets and liabilities that were transacted in a currency other than the entity’s functional currency, and the related remeasurement adjustments were recorded in interest and other income, net, on the Condensed Consolidated Statements of Operations. From time to time, Ciena uses foreign currency forwards to hedge this type of balance sheet exposure. These forwards are not designated as hedges for accounting purposes, and any net gain or loss associated with these derivatives is reported in interest and other income, net, on the Condensed Consolidated Statements of Operations. During the first three months of fiscal 2020 , Ciena recorded gains of $0.6 million from non-hedge designated foreign currency forward contracts. During the first three months of fiscal 2019 , Ciena recorded minimal gains from non-hedge designated foreign currency forward contracts.

Income Taxes

Income Taxes	3 Months Ended
	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES On December 2, 2019, the U.S. Department of the Treasury released final regulations and proposed regulations under Section 59A, Base Erosion and Anti-Abuse Tax (“BEAT”). BEAT, which requires certain U.S. corporations to pay a minimum tax associated with deductible payments to non-U.S. related parties, was enacted by the Tax Cuts and Jobs Act (the “Tax Act”). Also, on December 2, 2019, the U.S. Department of the Treasury released final regulations that provide additional guidance with respect to the foreign tax credit regime under the Tax Act. The effective tax rate for the three months ended January 31, 2020 was lower than the effective tax rate for the three months ended January 31, 2019 , primarily due to the effect of the final regulations on December 2, 2019.

Short-Term and Long-Term Invest

Short-Term and Long-Term Investments	3 Months Ended
	Jan. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Short-Term and Long-Term Investments	SHORT-TERM AND LONG-TERM INVESTMENTS As of the dates indicated, investments are comprised of the following (in thousands): January 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. government obligations: Included in short-term investments $ 109,962 $ 105 $ — $ 110,067 Included in long-term investments 10,073 3 — 10,076 $ 120,035 $ 108 $ — $ 120,143 October 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. government obligations: Included in short-term investments $ 109,715 $ 225 $ — $ 109,940 Included in long-term investments 10,017 — (3 ) 10,014 $ 119,732 $ 225 $ (3 ) $ 119,954 The following table summarizes the final legal maturities of debt investments at January 31, 2020 (in thousands): Amortized Cost Estimated Fair Value Less than one year $ 109,962 $ 110,067 Due in 1-2 years 10,073 10,076 $ 120,035 $ 120,143

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Jan. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS As of the date indicated, the following table summarizes the assets and liabilities that are recorded at fair value on a recurring basis (in thousands): January 31, 2020 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 632,620 $ — $ — $ 632,620 Bond mutual fund 50,180 — — 50,180 U.S. government obligations — 120,143 — 120,143 Foreign currency forward contracts — 273 — 273 Total assets measured at fair value $ 682,800 $ 120,416 $ — $ 803,216 Liabilities: Foreign currency forward contracts $ — $ 710 $ — $ 710 Forward starting interest rate swaps — 22,225 — 22,225 Contingent consideration — — 3,705 3,705 Total liabilities measured at fair value $ — $ 22,935 $ 3,705 $ 26,640 October 31, 2019 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 759,114 $ — $ — $ 759,114 U.S. government obligations — 119,954 — 119,954 Foreign currency forward contracts — 1,570 — 1,570 Total assets measured at fair value $ 759,114 $ 121,524 $ — $ 880,638 Liabilities: Foreign currency forward contracts $ — $ 35 $ — $ 35 Forward starting interest rate swaps — 21,093 — 21,093 Contingent consideration — — 3,705 3,705 Total liabilities measured at fair value $ — $ 21,128 $ 3,705 $ 24,833 As of the date indicated, the assets and liabilities above are presented on Ciena’s Condensed Consolidated Balance Sheets as follows (in thousands): January 31, 2020 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 682,800 $ — $ — $ 682,800 Short-term investments — 110,067 — 110,067 Prepaid expenses and other — 273 — 273 Long-term investments — 10,076 — 10,076 Total assets measured at fair value $ 682,800 $ 120,416 $ — $ 803,216 Liabilities: Accrued liabilities and other short-term obligations $ — $ 710 $ 3,705 $ 4,415 Other long-term obligations — 22,225 — 22,225 Total liabilities measured at fair value $ — $ 22,935 $ 3,705 $ 26,640 October 31, 2019 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 759,114 $ — $ — $ 759,114 Short-term investments — 109,940 — 109,940 Prepaid expenses and other — 1,570 — 1,570 Long-term investments — 10,014 — 10,014 Total assets measured at fair value $ 759,114 $ 121,524 $ — $ 880,638 Liabilities: Accrued liabilities and other short-term obligations $ — $ 35 $ — $ 35 Other long-term obligations — 21,093 3,705 24,798 Total liabilities measured at fair value $ — $ 21,128 $ 3,705 $ 24,833 Ciena did not have any transfers between Level 1 and Level 2 fair value measurements during the periods presented. Ciena’s Level 3 liability includes $3.7 million in accrued liabilities and other short-term obligations as of January 31, 2020 . This reflects a contingent consideration element of a three-year payout arrangement associated with Ciena’s purchase of DonRiver Holdings, LLC (“DonRiver”) in the fourth quarter of fiscal 2018. As of January 31, 2020 , there was no material change to the fair value.

Inventories

Inventories	3 Months Ended
	Jan. 31, 2020
Inventory Disclosure [Abstract]
Inventories	INVENTORIES As of the dates indicated, inventories are comprised of the following (in thousands): January 31, October 31, Raw materials $ 106,522 $ 99,041 Work-in-process 11,728 13,657 Finished goods 219,907 226,622 Deferred cost of goods sold 49,256 53,051 Gross inventories 387,413 392,371 Provision for excess and obsolescence (44,740 ) (47,322 ) Inventories, net $ 342,673 $ 345,049 Ciena writes down its inventory for estimated obsolescence or unmarketable inventory by an amount equal to the difference between the cost of inventory and the estimated net realizable value based on assumptions about future demand, which are affected by changes in Ciena’s strategic direction, discontinuance of a product or introduction of newer versions of products, declines in the sales of or forecasted demand for certain products, and general market conditions. During the first three months of fiscal 2020 , Ciena recorded a provision for excess and obsolescence of $6.7 million , primarily related to a decrease in the forecasted demand for certain Networking Platforms products. Deductions from the provision for excess and obsolete inventory relate primarily to disposal activities.

Prepaid Expenses and Other

Prepaid Expenses and Other	3 Months Ended
	Jan. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
PREPAID EXPENSES AND OTHER	PREPAID EXPENSES AND OTHER As of the dates indicated, prepaid expenses and other are comprised of the following (in thousands): January 31, October 31, Prepaid VAT and other taxes $ 87,706 $ 84,706 Contract assets for unbilled accounts receivable 83,717 84,046 Prepaid expenses 65,806 48,680 Product demonstration equipment, net 37,866 38,900 Other non-trade receivables 36,236 28,136 Capitalized contract acquisition costs 9,391 11,677 Deferred deployment expense 318 125 Derivative assets 273 1,570 Restricted cash — 74 $ 321,313 $ 297,914 Depreciation of product demonstration equipment was $2.2 million during the first three months of each of fiscal 2020 and 2019 . For further discussion on contract assets and capitalized contract acquisition costs, see Note 3 above.

Other Balance Sheet Details

Other Balance Sheet Details	3 Months Ended
	Jan. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Other Balance Sheet Details	OTHER BALANCE SHEET DETAILS As of the dates indicated, accrued liabilities and other short-term obligations are comprised of the following (in thousands): January 31, October 31, Compensation, payroll related tax and benefits (1) $ 68,924 $ 182,363 Warranty 51,190 48,498 Vacation 22,708 22,290 Contingent consideration 3,705 4,372 Contingent compensation 2,880 — Finance lease obligations 2,710 2,764 Interest payable 717 1,007 Other 120,471 121,446 $ 273,305 $ 382,740 (1) Reduction is primarily due to the timing of bonus payments to employees under our annual cash incentive compensation plan. The following table summarizes the activity in Ciena’s accrued warranty for the fiscal periods indicated (in thousands): Three Months Ended January 31, Beginning Balance Current Period Provisions Settlements Ending Balance 2019 $ 44,740 3,891 (4,183 ) $ 44,448 2020 $ 48,498 7,898 (5,206 ) $ 51,190

Derivative Instruments

Derivative Instruments	3 Months Ended
	Jan. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	DERIVATIVE INSTRUMENTS Foreign Currency Derivatives As of January 31, 2020 and October 31, 2019 , Ciena had forward contracts to hedge its foreign exchange exposure in order to reduce the variability in its Canadian Dollar- and Indian Rupee-denominated expense, which principally relates to research and development activities. The notional amount of these contracts was approximately $180.4 million and $197.4 million as of January 31, 2020 and October 31, 2019 , respectively. These foreign exchange contracts have maturities of 24 months or less and have been designated as cash flow hedges. As of January 31, 2020 and October 31, 2019 , Ciena had forward contracts to hedge its foreign exchange exposure in order to reduce the variability in various currencies of certain balance sheet items. The notional amount of these contracts was approximately $187.7 million and $206.0 million as of January 31, 2020 and October 31, 2019 , respectively. These foreign exchange contracts have maturities of 12 months or less and have not been designated as hedges for accounting purposes. Interest Rate Derivatives Ciena is exposed to floating rates of LIBOR interest on its term loan borrowings (see Note 16 below) and has hedged such risk by entering into floating to fixed interest rate swap arrangements (“interest rate swaps”). The interest rate swaps fix the LIBOR rate for $350.0 million of the New 2025 Term Loan (as defined in Note 16 below) at 2.957% through September 2023. The total notional amount of interest rate swaps in effect was $350.0 million as of January 31, 2020 and October 31, 2019 . Ciena expects the variable rate payments to be received under the terms of the interest rate swaps to offset exactly the forecasted variable rate payments on the equivalent notional amounts of the term loan. These derivative contracts have been designated as cash flow hedges. Other information regarding Ciena’s derivatives is immaterial for separate financial statement presentation. See Note 6 and Note 9 above.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	3 Months Ended
	Jan. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	ACCUMULATED OTHER COMPREHENSIVE INCOME The following table summarizes the changes in accumulated balances of other comprehensive income (“AOCI”), net of tax, for the three months ended January 31, 2020 : Unrealized Gain/ Unrealized Gain/(Loss) on Unrealized Gain/(Loss) on Cumulative (Loss) on Available-for-sale Securities Foreign Currency Forward Contracts Forward Starting Interest Rate Swaps Foreign Currency Translation Adjustment Total Balance at October 31, 2019 $ 152 $ 925 $ (13,686 ) $ (9,475 ) $ (22,084 ) Other comprehensive loss before reclassifications (86 ) (921 ) (1,718 ) (2,982 ) (5,707 ) Amounts reclassified from AOCI — (158 ) 238 — 80 Balance at January 31, 2020 $ 66 $ (154 ) $ (15,166 ) $ (12,457 ) $ (27,711 ) The following table summarizes the changes in AOCI, net of tax, for the three months ended January 31, 2019 : Unrealized Unrealized Loss on Unrealized Loss on Cumulative Loss on Available-for-sale Securities Foreign Currency Forward Contracts Forward Starting Interest Rate Swaps Foreign Currency Translation Adjustment Total Balance at October 31, 2018 $ (425 ) $ (3,060 ) $ 6,417 $ (8,712 ) $ (5,780 ) Other comprehensive income (loss) before reclassifications 301 402 (7,593 ) 1,150 (5,740 ) Amounts reclassified from AOCI — 1,158 (278 ) — 880 Balance at January 31, 2019 $ (124 ) $ (1,500 ) $ (1,454 ) $ (7,562 ) $ (10,640 ) All amounts reclassified from AOCI related to settlement (gains) losses on foreign currency forward contracts designated as cash flow hedges impacted research and development expense on the Condensed Consolidated Statements of Operations. All amounts reclassified from AOCI related to settlement (gains) losses on forward starting interest rate swaps designated as cash flow hedges impacted interest and other income, net, on the Condensed Consolidated Statements of Operations.

Leases Leases

Leases Leases	3 Months Ended
	Jan. 31, 2020
Leases [Abstract]
Leases	LEASES Ciena leases over 1.4 million square feet of facilities globally related to the ongoing operations of its business segments and related functions. Ciena’s principal executive offices are located in Hanover, Maryland. Ciena’s largest facilities are research and development centers located in Ottawa, Canada and Gurgaon, India. Ciena also has engineering and/or service delivery facilities located in San Jose, California; Petaluma, California; Alpharetta, Georgia; Quebec, Canada; Austin, Texas; and Pune and Bangalore, India. In addition, Ciena leases various smaller offices in regions throughout the world to support sales and services operations. Office facilities are leased under various non-cancelable operating or finance leases. Ciena's current leases have remaining terms that vary up to 13 years . Certain leases provide for options to extend up to 10 years and/or options to terminate within eight years . As previously disclosed in Note 2 , the restructuring reserve liability related to our subleased space and vacated space for which subleases are being pursued was $11.1 million as of October 31, 2019 . Upon Ciena’s adoption of ASC 842 on November 1, 2019 , the existing Accrued liabilities and other short-term obligations and Other long-term obligations were reclassified as a reduction of the Operating right-of-use assets recorded in accordance with the updated guidance. Leases included in the Condensed Consolidated Balance Sheets were as follows: Classification As of January 31, 2020 Operating leases: Operating ROU Assets Operating right-of-use assets $ 50,148 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities 71,956 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 71,235 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (14,548 ) Buildings, net $ 56,687 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 66,831 The components of lease expense included in the Condensed Consolidated Statement of Operations were as follows: Three months ended Classification January 31, 2020 Operating lease costs Operating expense $ 4,457 Finance lease cost: Amortization of finance ROU asset Operating expense 1,140 Interest on finance lease liabilities Interest expense 1,244 Total finance lease cost 2,384 Non-capitalized lease cost Operating expense 621 Variable lease cost (1) Operating expense 1,311 Net lease cost (2) $ 8,773 (1) Variable lease costs includes expenses relating to insurance, taxes, maintenance and other costs required by the applicable operating lease. Variable lease costs are determined by whether they are to be included in base rent and if amounts are based on a consumer price index. (2) Excludes other operating expense of $4.3 million for the three months ended January 31, 2020 , related to amortization of leasehold improvements. Lease expense (excluding amortization of leasehold improvements of $2.4 million ) incurred in the three months ended January 31, 2019 was $6.8 million . Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of January 31, 2020 were as follows: Operating Leases Finance Leases Total Remaining fiscal 2020 $ 15,778 $ 7,512 $ 23,290 2021 18,261 7,491 25,752 2022 13,440 7,932 21,372 2023 10,157 8,008 18,165 2024 8,052 8,024 16,076 Thereafter 12,205 64,616 76,821 Total lease payments 77,893 103,583 181,476 Less: Imputed interest (5,937 ) (36,752 ) (42,689 ) Present value of lease liabilities 71,956 66,831 138,787 Less: Current portion of present value of minimum lease payments (18,623 ) (2,710 ) (21,333 ) Long-term portion of present value of minimum lease payments $ 53,333 $ 64,121 $ 117,454 As of January 31, 2020 , the weighted average remaining lease terms and weighted average discount rates for operating and finance leases were as follows: Weighted-average remaining lease term in years: Operating leases 4.91 Finance leases 12.62 Weighted-average discount rates: Operating leases 2.39 % Finance leases 7.56 % There was no significant non-cash lease activity for the three months ended January 31, 2020 . As of October 31, 2019 , minimum aggregate rentals under operating leases were as follows: 2020 2021 2022 2023 2024 Thereafter Total Operating leases (1) $ 28,776 $ 24,184 $ 16,767 $ 13,393 $ 10,632 $ 26,110 $ 119,862 1) The amount for operating lease commitments above include estimated variable expenses relating to insurance, taxes, maintenance and other costs required by the applicable operating lease.
Leases	LEASES Ciena leases over 1.4 million square feet of facilities globally related to the ongoing operations of its business segments and related functions. Ciena’s principal executive offices are located in Hanover, Maryland. Ciena’s largest facilities are research and development centers located in Ottawa, Canada and Gurgaon, India. Ciena also has engineering and/or service delivery facilities located in San Jose, California; Petaluma, California; Alpharetta, Georgia; Quebec, Canada; Austin, Texas; and Pune and Bangalore, India. In addition, Ciena leases various smaller offices in regions throughout the world to support sales and services operations. Office facilities are leased under various non-cancelable operating or finance leases. Ciena's current leases have remaining terms that vary up to 13 years . Certain leases provide for options to extend up to 10 years and/or options to terminate within eight years . As previously disclosed in Note 2 , the restructuring reserve liability related to our subleased space and vacated space for which subleases are being pursued was $11.1 million as of October 31, 2019 . Upon Ciena’s adoption of ASC 842 on November 1, 2019 , the existing Accrued liabilities and other short-term obligations and Other long-term obligations were reclassified as a reduction of the Operating right-of-use assets recorded in accordance with the updated guidance. Leases included in the Condensed Consolidated Balance Sheets were as follows: Classification As of January 31, 2020 Operating leases: Operating ROU Assets Operating right-of-use assets $ 50,148 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities 71,956 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 71,235 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (14,548 ) Buildings, net $ 56,687 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 66,831 The components of lease expense included in the Condensed Consolidated Statement of Operations were as follows: Three months ended Classification January 31, 2020 Operating lease costs Operating expense $ 4,457 Finance lease cost: Amortization of finance ROU asset Operating expense 1,140 Interest on finance lease liabilities Interest expense 1,244 Total finance lease cost 2,384 Non-capitalized lease cost Operating expense 621 Variable lease cost (1) Operating expense 1,311 Net lease cost (2) $ 8,773 (1) Variable lease costs includes expenses relating to insurance, taxes, maintenance and other costs required by the applicable operating lease. Variable lease costs are determined by whether they are to be included in base rent and if amounts are based on a consumer price index. (2) Excludes other operating expense of $4.3 million for the three months ended January 31, 2020 , related to amortization of leasehold improvements. Lease expense (excluding amortization of leasehold improvements of $2.4 million ) incurred in the three months ended January 31, 2019 was $6.8 million . Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of January 31, 2020 were as follows: Operating Leases Finance Leases Total Remaining fiscal 2020 $ 15,778 $ 7,512 $ 23,290 2021 18,261 7,491 25,752 2022 13,440 7,932 21,372 2023 10,157 8,008 18,165 2024 8,052 8,024 16,076 Thereafter 12,205 64,616 76,821 Total lease payments 77,893 103,583 181,476 Less: Imputed interest (5,937 ) (36,752 ) (42,689 ) Present value of lease liabilities 71,956 66,831 138,787 Less: Current portion of present value of minimum lease payments (18,623 ) (2,710 ) (21,333 ) Long-term portion of present value of minimum lease payments $ 53,333 $ 64,121 $ 117,454 As of January 31, 2020 , the weighted average remaining lease terms and weighted average discount rates for operating and finance leases were as follows: Weighted-average remaining lease term in years: Operating leases 4.91 Finance leases 12.62 Weighted-average discount rates: Operating leases 2.39 % Finance leases 7.56 % There was no significant non-cash lease activity for the three months ended January 31, 2020 . As of October 31, 2019 , minimum aggregate rentals under operating leases were as follows: 2020 2021 2022 2023 2024 Thereafter Total Operating leases (1) $ 28,776 $ 24,184 $ 16,767 $ 13,393 $ 10,632 $ 26,110 $ 119,862 1) The amount for operating lease commitments above include estimated variable expenses relating to insurance, taxes, maintenance and other costs required by the applicable operating lease.

Short-Term and Long-Term Debt

Short-Term and Long-Term Debt	3 Months Ended
	Jan. 31, 2020
Debt Disclosure [Abstract]
Short-Term and Long-Term Debt	SHORT-TERM AND LONG-TERM DEBT New 2025 Term Loan Pursuant to a Credit Agreement, dated July 15, 2014, as amended (the “Credit Agreement”), by and among Ciena, the lenders party thereto and Bank of America, N.A., as administrative agent (the “Administrative Agent”), Ciena maintained an existing senior secured term loan with an outstanding aggregate principal amount of $693.0 million as of January 23, 2020 and maturing on September 28, 2025 (the “Old 2025 Term Loan”). On January 23, 2020, Ciena, as borrower, and Ciena Communications, Inc., Ciena Government Solutions, Inc., Ciena Communications International, LLC and Blue Planet Software, Inc., as guarantors, entered into a Refinancing Amendment to Credit Agreement with the lenders party thereto and the Administrative Agent (the “Refinancing Agreement”), pursuant to which Ciena consummated a permitted refinancing of the entire outstanding amount of the Old 2025 Term Loan, and in accordance therewith, incurred new senior secured term loans in an aggregate principal amount of $693.0 million and maturing on September 28, 2025 (the “New 2025 Term Loan”). The proceeds of the New 2025 Term Loan were used in their entirety to refinance the 2025 Term Loan. This arrangement was primarily accounted for as a modification of debt and, as such, $0.1 million of debt issuance costs associated with the New 2025 Term Loan was expensed. The Refinancing Agreement amends the Credit Agreement and provides that the New 2025 Term Loan will, among other things: • mature on September 28, 2025; • amortize in equal quarterly installments in aggregate amounts equal to 0.25% , or $1.73 million , of the principal amount of the New 2025 Term Loan as of January 23, 2020, with the balance payable at maturity; • be subject to mandatory prepayment provisions on the occurrence of certain specified events substantially similar to the 2025 Term Loan, including certain asset sales, debt issuances, and receipt of annual Excess Cash Flow (as defined in the Credit Agreement); • bear interest, at Ciena’s election, at a per annum rate equal to (a) LIBOR (subject to a floor of 0.00% ) plus an applicable margin of 1.75% , or (b) a base rate (subject to a floor of 1.00% ) plus an applicable margin of 0.75% ; and • be repayable at any time at Ciena’s election, provided that repayment of the New 2025 Term Loan with proceeds of certain indebtedness prior to July 23, 2020 will require a prepayment premium of 1.00% of the aggregate principal amount of such prepayment. Except as amended by the Refinancing Agreement, the remaining terms of the Credit Agreement remain in full force and effect. The net carrying values of Ciena’s term loans were comprised of the following for the fiscal periods indicated (in thousands): January 31, 2020 October 31, 2019 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value Term Loan Payable due September 28, 2025 (New) $ 693,000 $ (1,824 ) $ (3,390 ) $ 687,786 $ — Term Loan Payable due September 28, 2025 (Old) $ — $ — $ — $ — $ 687,406 Deferred debt issuance costs that were deducted from the carrying amounts of the term loans totaled $3.4 million at January 31, 2020 and $3.6 million at October 31, 2019 . Deferred debt issuance costs are amortized using the straight-line method, which approximates the effect of the effective interest rate, through the maturity of the term loans. The amortization of deferred debt issuance costs for these term loans are included in interest expense, and were $0.2 million during the first three months of fiscal 2020 and fiscal 2019 . The carrying value of the term loans listed above is also net of any unamortized debt discounts. As of January 31, 2020 , the estimated fair value of the New 2025 Term Loan was $694.7 million . Ciena’s term loan is categorized as Level 2 in the fair value hierarchy. Ciena estimated the fair value of its term loan using a market approach based on observable inputs, such as current market transactions involving comparable securities.

Earnings Per Share Calculation

Earnings Per Share Calculation	3 Months Ended
	Jan. 31, 2020
Earnings Per Share [Abstract]
Earnings Per Share Calculation	EARNINGS PER SHARE CALCULATION The following tables (in thousands except per share amounts) reconcile basic net income per common share (“Basic EPS”) and diluted net income per potential common share (“Diluted EPS”). Basic EPS is computed using the weighted average number of common shares outstanding. Diluted EPS is computed using the weighted average number of the following, in each case, to the extent the effect is not anti-dilutive: (i) common shares outstanding; (ii) shares issuable upon vesting of stock unit awards; and (iii) shares issuable under Ciena’s employee stock purchase plan and upon exercise of outstanding stock options, using the treasury stock method. Quarter Ended January 31, Numerator 2020 2019 Net income used to calculate Basic and Diluted EPS $ 62,328 $ 33,616 Quarter Ended January 31, Denominator 2020 2019 Basic weighted average shares outstanding 154,334 156,314 Add: Shares underlying outstanding stock options and stock unit awards and issuable under employee stock purchase plan 1,404 1,860 Dilutive weighted average shares outstanding 155,738 158,174 Quarter Ended January 31, EPS 2020 2019 Basic EPS $ 0.40 $ 0.22 Diluted EPS $ 0.40 $ 0.21 The following table summarizes the weighted average shares excluded from the calculation of the denominator for Diluted EPS due to their anti-dilutive effect for the periods indicated (in thousands): Quarter Ended January 31, 2020 2019 Shares underlying stock options and stock unit awards 731 401 Total shares excluded due to anti-dilutive effect 731 401

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Jan. 31, 2020
Equity [Abstract]
Stockholders' Equity	STOCKHOLDERS’ EQUITY Stock Repurchase Program On December 13, 2018, Ciena announced that its Board of Directors authorized a program to repurchase up to $500 million of Ciena’s common stock. The amount and timing of repurchases are subject to a variety of factors including liquidity, cash flow, stock price, and general business and market conditions. The program may be modified, suspended, or discontinued at any time. The following table summarizes activity of the stock repurchase program, reported based on trade date: Shares Repurchased Weighted-Average Price per Share Amount Repurchased (in thousands) Cumulative balance at October 31, 2019 3,838,466 $ 39.10 $ 150,076 Repurchase of common stock under the stock repurchase program 1,288,111 39.36 50,704 Cumulative balance at January 31, 2020 5,126,577 $ 39.16 $ 200,780 The purchase price for the shares of Ciena’s stock repurchased is reflected as a reduction of common stock and additional paid-in capital. Stock Repurchases Related to Stock Unit Award Tax Withholdings Ciena repurchases shares of common stock to satisfy employee tax withholding obligations due on vesting of stock unit awards. The purchase price of $ 12.6 million for the shares of Ciena’s stock repurchased during the first three months of fiscal 2020 is reflected as a reduction to stockholders’ equity. Ciena is required to allocate the purchase price of the repurchased shares as a reduction of common stock and additional paid-in capital.

Share-Based Compensation Expens

Share-Based Compensation Expense	3 Months Ended
	Jan. 31, 2020
Share-based Payment Arrangement [Abstract]
Share-Based Compensation Expense	SHARE-BASED COMPENSATION EXPENSE The following table summarizes share-based compensation expense for the periods indicated (in thousands): Quarter Ended January 31, 2020 2019 Product costs $ 671 $ 637 Service costs 842 770 Share-based compensation expense included in cost of goods sold 1,513 1,407 Research and development 3,849 3,391 Sales and marketing 4,613 3,785 General and administrative 5,527 5,112 Share-based compensation expense included in operating expense 13,989 12,288 Share-based compensation expense capitalized in inventory, net 100 60 Total share-based compensation $ 15,602 $ 13,755 As of January 31, 2020 , total unrecognized share-based compensation expense was approximately $141.7 million , which relates to unvested stock unit awards and is expected to be recognized over a weighted-average period of 1.7

Segments and Entity-Wide Disclo

Segments and Entity-Wide Disclosures	3 Months Ended
	Jan. 31, 2020
Segment Reporting [Abstract]
Segments and Entity-Wide Disclosures	SEGMENTS AND ENTITY-WIDE DISCLOSURES Segment Reporting Ciena has the following operating segments for reporting purposes: (i) Networking Platforms; (ii) Platform Software and Services; (iii) Blue Planet Automation Software and Services; and (iv) Global Services. During fiscal 2019, Ciena separated its previous Software and Software-Related Services segment into two stand-alone operating segments. Because Ciena previously disclosed its Platform Software and Services and Blue Planet Automation Software and Services as distinct product lines in its presentation of segment revenue for Software and Software-Related Services, there is no significant change to the presentation of segment revenues as a result of this separation. Comparative periods have been retrospectively adjusted to disclose segment profit for Platform Software and Services and Blue Planet Automation Software and Services. See Note 3 to Ciena’s Condensed Consolidated Financial Statements included in Item 1 of Part I of this report. Ciena's long-lived assets, including equipment, building, furniture and fixtures, finite-lived intangible assets and maintenance spares, are not reviewed by Ciena's chief operating decision maker for purposes of evaluating performance and allocating resources. As of January 31, 2020 , equipment, building, furniture and fixtures, net, totaled $277.7 million , and operating right of use assets, net totaled $50.1 million , primarily supporting asset groups within Ciena’s Networking Platforms, Platform Software and Services and Blue Planet Automation Software and Services segments and supporting Ciena’s unallocated selling and general and administrative activities. As of January 31, 2020 , $17.9 million of Ciena’s intangible assets, net were assigned to asset groups within Ciena’s Networking Platforms segment and $107.7 million of Ciena’s intangible assets, net were assigned to asset groups within Ciena’s Blue Planet Automation Software and Services segment. As of January 31, 2020 , $65.7 million , $156.2 million and $89.0 million of Ciena’s Goodwill was assigned to asset groups within Ciena’s Networking Platforms, Platform Software and Services and Blue Planet Automation Software and Services segments, respectively. As of January 31, 2020 , all of the maintenance spares, net, totaling $54.9 million , were assigned to asset groups within Ciena’s Global Services segment. Segment Revenue The table below sets forth Ciena’s segment revenue for the respective periods (in thousands): Quarter Ended January 31, 2020 2019 Revenue: Networking Platforms Converged Packet Optical $ 591,549 $ 548,997 Packet Networking 67,508 71,569 Total Networking Platforms 659,057 620,566 Platform Software and Services 51,888 41,598 Blue Planet Automation Software and Services 15,466 14,974 Global Services Maintenance Support and Training 61,793 61,277 Installation and Deployment 34,954 30,622 Consulting and Network Design 9,754 9,490 Total Global Services 106,501 101,389 Consolidated revenue $ 832,912 $ 778,527 Segment Profit (Loss) Segment profit (loss) is determined based on internal performance measures used by Ciena’s chief executive officer to assess the performance of each operating segment in a given period. In connection with that assessment, the chief executive officer excludes the following items: selling and marketing costs; general and administrative costs; amortization of intangible assets; significant asset impairments and restructuring costs; acquisition and integration costs; interest and other income, net; interest expense; loss on extinguishment and modification of debt and provision for income taxes. The table below sets forth Ciena’s segment profit (loss) and the reconciliation to consolidated net income during the respective periods indicated (in thousands): Quarter Ended January 31, 2020 2019 Segment profit (loss): Networking Platforms $ 168,270 $ 136,590 Platform Software and Services 28,951 20,464 Blue Planet Automation Software and Services (3,113 ) (2,047 ) Global Services 45,527 39,701 Total segment profit 239,635 194,708 Less: Non-performance operating expenses Selling and marketing 107,066 98,113 General and administrative 42,468 39,243 Amortization of intangible assets 5,853 5,528 Significant asset impairments and restructuring costs 4,472 2,273 Acquisition and integration costs 1,819 1,608 Add: Other non-performance financial items Interest expense and other income, net (5,169 ) (5,188 ) Loss on extinguishment and modification of debt (646 ) — Less: Provision for income taxes 9,814 9,139 Consolidated net income $ 62,328 $ 33,616 Entity-Wide Reporting Ciena’s operating segments each engage in business across three geographic regions: Americas; Europe, Middle East and Africa (“EMEA”); and Asia-Pacific, Japan and India (“APAC”). Americas include activities in North America and South America (previously, Caribbean and Latin America (“CALA”)). The following table reflects Ciena’s geographic distribution of revenue principally based on the relevant location for Ciena’s delivery of products and performance of services. For the periods below, Ciena’s geographic distribution of revenue was as follows (in thousands): Quarter Ended January 31, 2020 2019 Americas $ 574,004 $ 516,481 EMEA 129,965 129,190 APAC 128,943 132,856 Total $ 832,912 $ 778,527 Ciena’s revenue includes $524.3 million and $464.1 million of United States revenue for the first quarter of fiscal 2020 and 2019 , respectively. No other country accounted for 10% or more of total revenue for the periods presented above. The following table reflects Ciena’s geographic distribution of equipment, building, furniture and fixtures, net, with any country accounting for at least 10% of total equipment, building, furniture and fixtures, net, specifically identified. Equipment, building, furniture and fixtures, net, attributable to geographic regions outside of the U.S. and Canada are reflected as “Other International.” For the periods below, Ciena’s geographic distribution of equipment, building, furniture and fixtures, net, was as follows (in thousands): January 31, October 31, Canada $ 209,101 $ 211,901 United States 51,819 58,119 Other International 16,819 16,864 Total $ 277,739 $ 286,884 For the periods below, the only customers that accounted for at least 10% of Ciena’s revenue were as follows (in thousands): Quarter Ended January 31, 2020 2019 Verizon $ 114,548 $ 88,775 AT&T 84,010 94,172 Web-scale provider n/a 89,514 Total $ 198,558 $ 272,461 n/a Denotes revenue representing less than 10% of total revenue for the period The Web-scale provider noted above contributed greater than 10% of total revenue for the first time in fiscal 2019 and purchased products from each of Ciena’s operating segments excluding Blue Planet Automation Software and Services. The other customers identified above purchased products and services from each of Ciena’s operating segments.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Jan. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Canadian Grant During fiscal 2018, Ciena entered into agreements related to the Evolution of Networking Services through a Corridor in Quebec and Ontario for Research and Innovation (“ENCQOR”) project with the Canadian federal government, the government of the province of Ontario and the government of the province of Quebec to develop a 5G technology corridor between Quebec and Ontario to promote research and development, small business enterprises and entrepreneurs in Canada. Under these agreements, Ciena can receive up to an aggregate CAD$ 57.6 million (approximately $43.5 million ) in reimbursement from the three Canadian government entities for eligible costs over a period commencing on February 20, 2017 and ending on March 31, 2022. Ciena anticipates receiving recurring disbursements over this period. Amounts received under the agreements are subject to recoupment in the event that Ciena fails to achieve certain minimum investment, employment and project milestones. As of January 31, 2020 , Ciena has recorded CAD $32.5 million (approximately $24.6 million ) in cumulative benefits as a reduction in research and development expense of which CAD $3.6 million (approximately $2.7 million ) was recorded in the first three months of fiscal 2020. As of January 31, 2020 , amounts receivable from this grant were CAD $12.0 million (approximately $9.1 million ). Tax Contingencies Ciena is subject to various tax liabilities arising in the ordinary course of business. Ciena does not expect that the ultimate settlement of these tax liabilities will have a material effect on its results of operations, financial position or cash flows. Litigation Ciena is subject to various legal proceedings, claims and other matters arising in the ordinary course of business, including those that relate to employment, commercial, tax and other regulatory matters. Ciena is also subject to intellectual property related claims, including claims against third parties that may involve contractual indemnification obligations on the part of Ciena. Ciena does not expect that the ultimate costs to resolve such matters will have a material effect on its results of operations, financial position or cash flows.

Subsequent Events

Subsequent Events	3 Months Ended
	Jan. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Stock Repurchase Program From the end of the first quarter of fiscal 2020 through March 6 , 2020 , Ciena repurchased an additional 443,958 shares of its common stock, for an aggregate purchase price of $18.6 million at an average price of $41.90 per share, inclusive of repurchases pending settlement. As of March 6 , 2020 , Ciena has repurchased an aggregate of 5,570,535 shares and has an aggregate of $280.6 million of authorized funds remaining under its stock repurchase program.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	3 Months Ended
	Jan. 31, 2020
Accounting Policies [Abstract]
Newly Issued Accounting Standards - Effective and Not Yet Effective	Newly Issued Accounting Standards - Effective Leases In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Codification ASC 842 , Leases , which requires an entity to recognize assets and liabilities on the balance sheet for the rights and obligations created by leased assets and to provide additional disclosures. Effective November 1, 2019 , Ciena adopted ASC 842 which requires right-of-use ("ROU") assets and lease liabilities to be recorded on the balance sheet for leases. The guidance specifies that at the inception of a contract, an entity must determine whether the contract is or contains a lease. The contract is or contains a lease if the contract conveys the right to control the use of the property, plant, or equipment for a designated term in exchange for consideration. Ciena’s evaluation of its contracts followed the assessment of whether there was a right to obtain substantially all of the economic benefits from the use and the right to direct the use of the identified asset in the contract. Operating leases are included in the Operating right-of-use assets (“Operating ROU assets”), Operating lease liabilities and Long-term operating lease liabilities in the Condensed Consolidated Balance Sheets. Finance leases are included in Equipment, building, furniture and fixtures, net (“Finance ROU assets”), Accrued liabilities and other short-term obligations and Other long-term obligations are included in the Condensed Consolidated Balance Sheets. Ciena adopted the guidance on a modified retrospective basis as of November 1, 2019 , such that related amounts in prior periods have not been restated. Ciena has operating and finance leases that primarily relate to real property. As a practical expedient, Ciena has elected the “package of practical expedients” and, as a result, did not reassess existing lease identifications, lease classifications or initial direct costs. As a practical expedient, Ciena has elected not to capitalize leases with a term of 12 months or less without a purchase option that it is likely to exercise. Also as a practical expedient for disclosure, Ciena has elected not to separate lease and non-lease components on operating and finance leases. Lease components are payment items directly attributable to the use of the underlying asset, while non-lease components are explicit elements of a contract not directly related to the use of the underlying asset, including pass through operating expenses like common area maintenance and utilities. Operating ROU assets and lease liabilities and Finance ROU assets and lease liabilities are recognized on the Condensed Consolidated Balance Sheets at the present value of the future lease payments over the life of the lease term. Ciena uses discount rates based on incremental borrowing rates, on a collateralized basis, for the respective underlying assets, for terms similar to the respective leases when implicit rates for leases are not determinable. Operating lease costs are included as rent expense in the Condensed Consolidated Statements of Operations. Fixed base payments on operating leases paid directly to the lessor are recorded as lease expense on a straight-line basis. Related variable payments based on usage, changes in an index, or market rate are expensed as incurred. Finance ROU assets are generally amortized on a straight line basis over the lease term with the interest expense on the lease liability recorded using the interest method. The amortization and interest expense are recorded separately in the Condensed Consolidated Statements of Operations. Upon adoption, Ciena recorded Operating ROU assets of $53.3 million and lease liabilities of $76.0 million related to its operating leases. As of October 31, 2019 , the restructuring reserve liability for vacated office space of $11.1 million was included in Accrued liabilities and other short-term obligations and Other long-term obligations on the Condensed Consolidated Balance Sheet under prior accounting guidance. Upon adoption of the updated guidance, the existing lease reserve liability was reclassified as a reduction to the Operating ROU assets. ROU assets will be tested for impairment when circumstances indicate that the carrying values may not be recoverable. The adoption of this guidance did not require a cumulative effect adjustment or have an impact on the Condensed Consolidated Statements of Income or Condensed Consolidated Statements of Cash Flows. Opening Balance Adjustments The following table summarizes the cumulative effect of the changes made to Ciena’s Condensed Consolidated Balance Sheet in connection with the adoption of ASC 842 (in millions): Balance at October 31, 2019 New Lease Accounting Standard Adjusted Balance at November 1, 2019 ASSETS: Operating right-of-use assets $ — $ 53,334 (1) $ 53,334 Total assets $ 3,893,346 $ 53,334 $ 3,946,680 LIABILITIES AND STOCKHOLDERS’ EQUITY: Accrued liabilities and other short-term obligations $ 382,740 $ (1,484 ) (2) $ 381,256 Short-term lease liabilities $ — 20,498 (3) $ 20,498 Other long-term obligations $ 148,747 (21,244 ) (4) $ 127,503 Long-term operating lease liabilities $ — 55,564 (5) $ 55,564 Total liabilities and stockholders equity $ 3,893,346 $ 53,334 $ 3,946,680 (1) Represents $76.0 million of operating leases recognized as Operating ROU assets upon adoption of ASC 842, less $5.4 million of deferred rent, $6.2 million of tenant improvement allowances, $1.5 million of short-term restructuring reserve liability and $9.6 million of long-term restructuring reserve liability all recognized as a reduction to Right-of-use assets. (2) Represents $1.5 million of short-term restructuring reserve liability recognized as a reduction to Operating ROU assets. (3) Represents $20.5 million of lease liabilities for operating leases. (4) Represents $9.6 million of long-term restructuring reserve liability, $5.4 million of deferred rent, and $6.2 million of tenant improvement allowances recognized as a reduction to Right-of-use assets. (5) Represents $55.6 million of lease liabilities for operating leases. See Note 15 for additional information. Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-13 ( “ASU 2018-13” ), Fair Value Measurement (Topic 820): Disclosure Framework which modifies the disclosure requirements on fair value measurements. Ciena adopted ASU 2018-13 beginning the first quarter of fiscal year 2020. Adoption of ASU 2018-13 did not have a material effect on Ciena’s financial position or results of operations. Newly Issued Accounting Standards - Not Yet Effective In June 2016, the FASB issued ASU No. 2016-13 ( “ASU 2016-13” ), Financial Instruments - Credit Losses, which requires measurement and recognition of expected credit losses for financial assets held based on historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. ASU 2016-13 is effective for Ciena beginning in the first quarter of fiscal 2021, and early adoption is permitted. Ciena is currently evaluating the impact of this accounting standard update on its Consolidated Financial Statements and related disclosures.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	3 Months Ended
	Jan. 31, 2020
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following table summarizes the cumulative effect of the changes made to Ciena’s Condensed Consolidated Balance Sheet in connection with the adoption of ASC 842 (in millions): Balance at October 31, 2019 New Lease Accounting Standard Adjusted Balance at November 1, 2019 ASSETS: Operating right-of-use assets $ — $ 53,334 (1) $ 53,334 Total assets $ 3,893,346 $ 53,334 $ 3,946,680 LIABILITIES AND STOCKHOLDERS’ EQUITY: Accrued liabilities and other short-term obligations $ 382,740 $ (1,484 ) (2) $ 381,256 Short-term lease liabilities $ — 20,498 (3) $ 20,498 Other long-term obligations $ 148,747 (21,244 ) (4) $ 127,503 Long-term operating lease liabilities $ — 55,564 (5) $ 55,564 Total liabilities and stockholders equity $ 3,893,346 $ 53,334 $ 3,946,680 (1) Represents $76.0 million of operating leases recognized as Operating ROU assets upon adoption of ASC 842, less $5.4 million of deferred rent, $6.2 million of tenant improvement allowances, $1.5 million of short-term restructuring reserve liability and $9.6 million of long-term restructuring reserve liability all recognized as a reduction to Right-of-use assets. (2) Represents $1.5 million of short-term restructuring reserve liability recognized as a reduction to Operating ROU assets. (3) Represents $20.5 million of lease liabilities for operating leases. (4) Represents $9.6 million of long-term restructuring reserve liability, $5.4 million of deferred rent, and $6.2 million of tenant improvement allowances recognized as a reduction to Right-of-use assets. (5) Represents $55.6 million of lease liabilities for operating leases.

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Jan. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The tables below (in thousands) set forth Ciena’s disaggregated revenue for the respective period: Quarter Ended January 31, 2020 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 591,549 $ — $ — $ — $ 591,549 Packet Networking 67,508 — — — 67,508 Platform Software and Services — 51,888 — — 51,888 Blue Planet Automation Software and Services — — 15,466 — 15,466 Maintenance Support and Training — — — 61,793 61,793 Installation and Deployment — — — 34,954 34,954 Consulting and Network Design — — — 9,754 9,754 Total revenue by product line $ 659,057 $ 51,888 $ 15,466 $ 106,501 $ 832,912 Timing of revenue recognition: Products and services at a point in time $ 659,057 $ 13,114 $ 3,736 $ 4,197 $ 680,104 Services transferred over time — 38,774 11,730 102,304 152,808 Total revenue by timing of revenue recognition $ 659,057 $ 51,888 $ 15,466 $ 106,501 $ 832,912 Quarter Ended January 31, 2019 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 548,997 $ — $ — $ — $ 548,997 Packet Networking 71,569 — — — 71,569 Platform Software and Services — 41,598 — — 41,598 Blue Planet Automation Software and Services — — 14,974 — 14,974 Maintenance Support and Training — — — 61,277 61,277 Installation and Deployment — — — 30,622 30,622 Consulting and Network Design — — — 9,490 9,490 Total revenue by product line $ 620,566 $ 41,598 $ 14,974 $ 101,389 $ 778,527 Timing of revenue recognition: Products and services at a point in time $ 620,566 $ 16,044 $ 6,228 $ 3,566 $ 646,404 Services transferred over time — 25,554 8,746 97,823 132,123 Total revenue by timing of revenue recognition $ 620,566 $ 41,598 $ 14,974 $ 101,389 $ 778,527 Effective the beginning of fiscal 2020, Ciena’s Global Sales and Marketing organization combined its previous North America and Caribbean and Latin America (“CALA”) regions into a new “Americas” sales region. Accordingly, Ciena reflects its sales geographically around the following markets: (i) Americas; (ii) Europe, Middle East and Africa (“EMEA”); and (iii) Asia Pacific, Japan and India (“APAC”). Within each geographic area, we maintain specific teams or personnel that focus on a particular region, country, customer or market vertical. These teams include sales management, account salespersons and sales engineers, as well as services professionals and commercial management personnel, who ensure that we maintain a high-touch, consultative relationship with our customers. For the periods below, Ciena’s geographic distribution of revenue was as follows (in thousands): Quarter Ended January 31, 2020 2019 Geographic distribution: Americas $ 574,004 $ 516,481 EMEA 129,965 129,190 APAC 128,943 132,856 Total revenue by geographic distribution $ 832,912 $ 778,527
Contract Balances	The following table provides information about receivables, contract assets and contract liabilities (deferred revenue) from contracts with customers (in thousands): Balance at January 31, 2020 Balance at October 31, 2019 Accounts receivable, net $ 655,105 $ 724,854 Contract assets $ 83,717 $ 84,046 Deferred revenue $ 166,835 $ 156,873

Business Combinations (Tables)

Business Combinations (Tables)	3 Months Ended
	Jan. 31, 2020
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the final purchase price allocation related to the acquisition based on the estimated fair value of the acquired assets and assumed liabilities (in thousands): Amount Cash and cash equivalents $ 5,718 Accounts receivable 610 Prepaid expenses and other 536 Equipment, furniture and fixtures 17 Goodwill 13,055 Customer relationships and contracts 400 Developed technology 22,200 Accounts payable (47 ) Accrued liabilities (286 ) Deferred revenue (1,493 ) Deferred tax liability (6,692 ) Total purchase consideration $ 34,018

Restructuring Costs (Tables)

Restructuring Costs (Tables)	3 Months Ended
	Jan. 31, 2020
Restructuring and Related Activities [Abstract]
Schedule of Activity and Balance of the Restructuring Liability Accounts	The following table sets forth the restructuring activity and balance of the restructuring liability accounts, which are included in Accrued liabilities and other short-term obligations on our Condensed Consolidated Balance Sheets, for the three months ended January 31, 2020 (in thousands): Workforce reduction Consolidation of excess facilities and other restructuring activities Total Balance at October 31, 2019 $ 3,983 $ 11,160 $ 15,143 Charges 1,204 (1) 3,268 (2) 4,472 Adjustments related to ASC 842 — (11,160 ) (3) (11,160 ) Cash payments (2,955 ) (3,268 ) (6,223 ) Balance at January 31, 2020 $ 2,232 $ — $ 2,232 Current restructuring liabilities $ 2,232 $ — $ 2,232 Non-current restructuring liabilities $ — $ — $ — (1) Reflects a global workforce reduction of approximately 22 employees during the three months ended January 31, 2020 as part of a business optimization strategy to improve gross margin, constrain operating expense and redesign certain business processes. (2) Primarily represents variable costs and imputed interest expense related to restructured facilities (3) Represents restructuring reserve liability recognized as a reduction to Operating right-of-use assets, net in relation to adoption of ASC 842. See Notes 2 and 15 for further discussion. The following table sets forth the restructuring activity and balance of the restructuring liability accounts, which are included in Accrued liabilities and other short-term obligations on our Condensed Consolidated Balance Sheets for the three months ended January 31, 2019 (in thousands): Workforce reduction Consolidation of excess facilities Total Balance at October 31, 2018 $ 2,108 $ 1,739 $ 3,847 Charges 1,752 (1) 521 (2) 2,273 Cash payments (3,009 ) (548 ) (3,557 ) Balance at January 31, 2019 $ 851 $ 1,712 $ 2,563 Current restructuring liabilities $ 851 $ 525 $ 1,376 Non-current restructuring liabilities $ — $ 1,187 $ 1,187 (1) Reflects a global workforce reduction of approximately 10 employees during the three months ended January 31, 2019 as part of a business optimization strategy to improve gross margin, constrain operating expense and redesign certain business processes. (2)

Interest and Other Income, Net

Interest and Other Income, Net (Tables)	3 Months Ended
	Jan. 31, 2020
Other Income and Expenses [Abstract]
Schedule of Interest and Other Income, Net	The components of interest and other income, net, are as follows (in thousands): Quarter Ended January 31, 2020 2019 Interest income $ 3,390 $ 3,872 Gains on non-hedge designated foreign currency forward contracts 637 22 Foreign currency exchange gains (losses) (771 ) 783 Other 390 (424 ) Interest and other income, net $ 3,646 $ 4,253

Short-Term and Long-Term Inve_2

Short-Term and Long-Term Investments (Tables)	3 Months Ended
	Jan. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Schedule of Short-Term and Long-Term Investments	As of the dates indicated, investments are comprised of the following (in thousands): January 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. government obligations: Included in short-term investments $ 109,962 $ 105 $ — $ 110,067 Included in long-term investments 10,073 3 — 10,076 $ 120,035 $ 108 $ — $ 120,143 October 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. government obligations: Included in short-term investments $ 109,715 $ 225 $ — $ 109,940 Included in long-term investments 10,017 — (3 ) 10,014 $ 119,732 $ 225 $ (3 ) $ 119,954
Schedule of Legal Maturities of Debt Investments	The following table summarizes the final legal maturities of debt investments at January 31, 2020 (in thousands): Amortized Cost Estimated Fair Value Less than one year $ 109,962 $ 110,067 Due in 1-2 years 10,073 10,076 $ 120,035 $ 120,143

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Jan. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of the Fair Value of Assets and Liabilities Recorded on a Recurring Basis	As of the date indicated, the following table summarizes the assets and liabilities that are recorded at fair value on a recurring basis (in thousands): January 31, 2020 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 632,620 $ — $ — $ 632,620 Bond mutual fund 50,180 — — 50,180 U.S. government obligations — 120,143 — 120,143 Foreign currency forward contracts — 273 — 273 Total assets measured at fair value $ 682,800 $ 120,416 $ — $ 803,216 Liabilities: Foreign currency forward contracts $ — $ 710 $ — $ 710 Forward starting interest rate swaps — 22,225 — 22,225 Contingent consideration — — 3,705 3,705 Total liabilities measured at fair value $ — $ 22,935 $ 3,705 $ 26,640 October 31, 2019 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 759,114 $ — $ — $ 759,114 U.S. government obligations — 119,954 — 119,954 Foreign currency forward contracts — 1,570 — 1,570 Total assets measured at fair value $ 759,114 $ 121,524 $ — $ 880,638 Liabilities: Foreign currency forward contracts $ — $ 35 $ — $ 35 Forward starting interest rate swaps — 21,093 — 21,093 Contingent consideration — — 3,705 3,705 Total liabilities measured at fair value $ — $ 21,128 $ 3,705 $ 24,833
Schedule of Assets and Liabilities as Presented on Ciena's Condensed Consolidated Balance Sheets	As of the date indicated, the assets and liabilities above are presented on Ciena’s Condensed Consolidated Balance Sheets as follows (in thousands): January 31, 2020 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 682,800 $ — $ — $ 682,800 Short-term investments — 110,067 — 110,067 Prepaid expenses and other — 273 — 273 Long-term investments — 10,076 — 10,076 Total assets measured at fair value $ 682,800 $ 120,416 $ — $ 803,216 Liabilities: Accrued liabilities and other short-term obligations $ — $ 710 $ 3,705 $ 4,415 Other long-term obligations — 22,225 — 22,225 Total liabilities measured at fair value $ — $ 22,935 $ 3,705 $ 26,640 October 31, 2019 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 759,114 $ — $ — $ 759,114 Short-term investments — 109,940 — 109,940 Prepaid expenses and other — 1,570 — 1,570 Long-term investments — 10,014 — 10,014 Total assets measured at fair value $ 759,114 $ 121,524 $ — $ 880,638 Liabilities: Accrued liabilities and other short-term obligations $ — $ 35 $ — $ 35 Other long-term obligations — 21,093 3,705 24,798 Total liabilities measured at fair value $ — $ 21,128 $ 3,705 $ 24,833

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Jan. 31, 2020
Inventory Disclosure [Abstract]
Schedule of Inventories	As of the dates indicated, inventories are comprised of the following (in thousands): January 31, October 31, Raw materials $ 106,522 $ 99,041 Work-in-process 11,728 13,657 Finished goods 219,907 226,622 Deferred cost of goods sold 49,256 53,051 Gross inventories 387,413 392,371 Provision for excess and obsolescence (44,740 ) (47,322 ) Inventories, net $ 342,673 $ 345,049

Prepaid Expenses and Other (Tab

Prepaid Expenses and Other (Tables)	3 Months Ended
	Jan. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses and other	As of the dates indicated, prepaid expenses and other are comprised of the following (in thousands): January 31, October 31, Prepaid VAT and other taxes $ 87,706 $ 84,706 Contract assets for unbilled accounts receivable 83,717 84,046 Prepaid expenses 65,806 48,680 Product demonstration equipment, net 37,866 38,900 Other non-trade receivables 36,236 28,136 Capitalized contract acquisition costs 9,391 11,677 Deferred deployment expense 318 125 Derivative assets 273 1,570 Restricted cash — 74 $ 321,313 $ 297,914

Other Balance Sheet Details (Ta

Other Balance Sheet Details (Tables)	3 Months Ended
	Jan. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Schedule of Accrued Liabilities	As of the dates indicated, accrued liabilities and other short-term obligations are comprised of the following (in thousands): January 31, October 31, Compensation, payroll related tax and benefits (1) $ 68,924 $ 182,363 Warranty 51,190 48,498 Vacation 22,708 22,290 Contingent consideration 3,705 4,372 Contingent compensation 2,880 — Finance lease obligations 2,710 2,764 Interest payable 717 1,007 Other 120,471 121,446 $ 273,305 $ 382,740 (1) Reduction is primarily due to the timing of bonus payments to employees under our annual cash incentive compensation plan.
Schedule of Accrued Warranties	The following table summarizes the activity in Ciena’s accrued warranty for the fiscal periods indicated (in thousands): Three Months Ended January 31, Beginning Balance Current Period Provisions Settlements Ending Balance 2019 $ 44,740 3,891 (4,183 ) $ 44,448 2020 $ 48,498 7,898 (5,206 ) $ 51,190

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Jan. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income	The following table summarizes the changes in accumulated balances of other comprehensive income (“AOCI”), net of tax, for the three months ended January 31, 2020 : Unrealized Gain/ Unrealized Gain/(Loss) on Unrealized Gain/(Loss) on Cumulative (Loss) on Available-for-sale Securities Foreign Currency Forward Contracts Forward Starting Interest Rate Swaps Foreign Currency Translation Adjustment Total Balance at October 31, 2019 $ 152 $ 925 $ (13,686 ) $ (9,475 ) $ (22,084 ) Other comprehensive loss before reclassifications (86 ) (921 ) (1,718 ) (2,982 ) (5,707 ) Amounts reclassified from AOCI — (158 ) 238 — 80 Balance at January 31, 2020 $ 66 $ (154 ) $ (15,166 ) $ (12,457 ) $ (27,711 ) The following table summarizes the changes in AOCI, net of tax, for the three months ended January 31, 2019 : Unrealized Unrealized Loss on Unrealized Loss on Cumulative Loss on Available-for-sale Securities Foreign Currency Forward Contracts Forward Starting Interest Rate Swaps Foreign Currency Translation Adjustment Total Balance at October 31, 2018 $ (425 ) $ (3,060 ) $ 6,417 $ (8,712 ) $ (5,780 ) Other comprehensive income (loss) before reclassifications 301 402 (7,593 ) 1,150 (5,740 ) Amounts reclassified from AOCI — 1,158 (278 ) — 880 Balance at January 31, 2019 $ (124 ) $ (1,500 ) $ (1,454 ) $ (7,562 ) $ (10,640 )

Leases (Tables)

Leases (Tables)	3 Months Ended
	Jan. 31, 2020
Leases [Abstract]
Leases Included in the Balance Sheet	Leases included in the Condensed Consolidated Balance Sheets were as follows: Classification As of January 31, 2020 Operating leases: Operating ROU Assets Operating right-of-use assets $ 50,148 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities 71,956 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 71,235 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (14,548 ) Buildings, net $ 56,687 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 66,831 As of January 31, 2020 , the weighted average remaining lease terms and weighted average discount rates for operating and finance leases were as follows: Weighted-average remaining lease term in years: Operating leases 4.91 Finance leases 12.62 Weighted-average discount rates: Operating leases 2.39 % Finance leases 7.56 %
Components of Lease Expense	The components of lease expense included in the Condensed Consolidated Statement of Operations were as follows: Three months ended Classification January 31, 2020 Operating lease costs Operating expense $ 4,457 Finance lease cost: Amortization of finance ROU asset Operating expense 1,140 Interest on finance lease liabilities Interest expense 1,244 Total finance lease cost 2,384 Non-capitalized lease cost Operating expense 621 Variable lease cost (1) Operating expense 1,311 Net lease cost (2) $ 8,773 (1) Variable lease costs includes expenses relating to insurance, taxes, maintenance and other costs required by the applicable operating lease. Variable lease costs are determined by whether they are to be included in base rent and if amounts are based on a consumer price index. (2) Excludes other operating expense of $4.3 million for the three months ended January 31, 2020 , related to amortization of leasehold improvements.
Lessee, Operating Lease, Liability, Maturity	Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of January 31, 2020 were as follows: Operating Leases Finance Leases Total Remaining fiscal 2020 $ 15,778 $ 7,512 $ 23,290 2021 18,261 7,491 25,752 2022 13,440 7,932 21,372 2023 10,157 8,008 18,165 2024 8,052 8,024 16,076 Thereafter 12,205 64,616 76,821 Total lease payments 77,893 103,583 181,476 Less: Imputed interest (5,937 ) (36,752 ) (42,689 ) Present value of lease liabilities 71,956 66,831 138,787 Less: Current portion of present value of minimum lease payments (18,623 ) (2,710 ) (21,333 ) Long-term portion of present value of minimum lease payments $ 53,333 $ 64,121 $ 117,454
Finance Lease, Liability, Maturity	Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of January 31, 2020 were as follows: Operating Leases Finance Leases Total Remaining fiscal 2020 $ 15,778 $ 7,512 $ 23,290 2021 18,261 7,491 25,752 2022 13,440 7,932 21,372 2023 10,157 8,008 18,165 2024 8,052 8,024 16,076 Thereafter 12,205 64,616 76,821 Total lease payments 77,893 103,583 181,476 Less: Imputed interest (5,937 ) (36,752 ) (42,689 ) Present value of lease liabilities 71,956 66,831 138,787 Less: Current portion of present value of minimum lease payments (18,623 ) (2,710 ) (21,333 ) Long-term portion of present value of minimum lease payments $ 53,333 $ 64,121 $ 117,454
Future Minimum Rental Payments for Operating Leases	As of October 31, 2019 , minimum aggregate rentals under operating leases were as follows: 2020 2021 2022 2023 2024 Thereafter Total Operating leases (1) $ 28,776 $ 24,184 $ 16,767 $ 13,393 $ 10,632 $ 26,110 $ 119,862 1) The amount for operating lease commitments above include estimated variable expenses relating to insurance, taxes, maintenance and other costs required by the applicable operating lease.

Short-Term and Long-Term Debt (

Short-Term and Long-Term Debt (Tables)	3 Months Ended
	Jan. 31, 2020
Debt Disclosure [Abstract]
Schedule of Carrying Values and Estimated Fair Values of Convertible Notes	The net carrying values of Ciena’s term loans were comprised of the following for the fiscal periods indicated (in thousands): January 31, 2020 October 31, 2019 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value Term Loan Payable due September 28, 2025 (New) $ 693,000 $ (1,824 ) $ (3,390 ) $ 687,786 $ — Term Loan Payable due September 28, 2025 (Old) $ — $ — $ — $ — $ 687,406

Earnings Per Share Calculation

Earnings Per Share Calculation (Tables)	3 Months Ended
	Jan. 31, 2020
Earnings Per Share [Abstract]
Schedule of Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share	The following tables (in thousands except per share amounts) reconcile basic net income per common share (“Basic EPS”) and diluted net income per potential common share (“Diluted EPS”). Basic EPS is computed using the weighted average number of common shares outstanding. Diluted EPS is computed using the weighted average number of the following, in each case, to the extent the effect is not anti-dilutive: (i) common shares outstanding; (ii) shares issuable upon vesting of stock unit awards; and (iii) shares issuable under Ciena’s employee stock purchase plan and upon exercise of outstanding stock options, using the treasury stock method. Quarter Ended January 31, Numerator 2020 2019 Net income used to calculate Basic and Diluted EPS $ 62,328 $ 33,616 Quarter Ended January 31, Denominator 2020 2019 Basic weighted average shares outstanding 154,334 156,314 Add: Shares underlying outstanding stock options and stock unit awards and issuable under employee stock purchase plan 1,404 1,860 Dilutive weighted average shares outstanding 155,738 158,174 Quarter Ended January 31, EPS 2020 2019 Basic EPS $ 0.40 $ 0.22 Diluted EPS $ 0.40 $ 0.21
Schedule of Weighted Average Shares Excluded From Calculation of Denominator for Basic and Diluted EPS	The following table summarizes the weighted average shares excluded from the calculation of the denominator for Diluted EPS due to their anti-dilutive effect for the periods indicated (in thousands): Quarter Ended January 31, 2020 2019 Shares underlying stock options and stock unit awards 731 401 Total shares excluded due to anti-dilutive effect 731 401

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Jan. 31, 2020
Equity [Abstract]
Schedule of Stock Repurchase Program	of the stock repurchase program, reported based on trade date: Shares Repurchased Weighted-Average Price per Share Amount Repurchased (in thousands) Cumulative balance at October 31, 2019 3,838,466 $ 39.10 $ 150,076 Repurchase of common stock under the stock repurchase program 1,288,111 39.36 50,704 Cumulative balance at January 31, 2020 5,126,577 $ 39.16 $ 200,780

Share-Based Compensation Expe_2

Share-Based Compensation Expense (Tables)	3 Months Ended
	Jan. 31, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Share-Based Compensation Expense	The following table summarizes share-based compensation expense for the periods indicated (in thousands): Quarter Ended January 31, 2020 2019 Product costs $ 671 $ 637 Service costs 842 770 Share-based compensation expense included in cost of goods sold 1,513 1,407 Research and development 3,849 3,391 Sales and marketing 4,613 3,785 General and administrative 5,527 5,112 Share-based compensation expense included in operating expense 13,989 12,288 Share-based compensation expense capitalized in inventory, net 100 60 Total share-based compensation $ 15,602 $ 13,755

Segments and Entity-Wide Disc_2

Segments and Entity-Wide Disclosures (Tables)	3 Months Ended
	Jan. 31, 2020
Segment Reporting [Abstract]
Schedule of Segment Revenue	The table below sets forth Ciena’s segment revenue for the respective periods (in thousands): Quarter Ended January 31, 2020 2019 Revenue: Networking Platforms Converged Packet Optical $ 591,549 $ 548,997 Packet Networking 67,508 71,569 Total Networking Platforms 659,057 620,566 Platform Software and Services 51,888 41,598 Blue Planet Automation Software and Services 15,466 14,974 Global Services Maintenance Support and Training 61,793 61,277 Installation and Deployment 34,954 30,622 Consulting and Network Design 9,754 9,490 Total Global Services 106,501 101,389 Consolidated revenue $ 832,912 $ 778,527
Schedule of Segment Profit (Loss) and the Reconciliation to Consolidated Net Income (Loss)	The table below sets forth Ciena’s segment profit (loss) and the reconciliation to consolidated net income during the respective periods indicated (in thousands): Quarter Ended January 31, 2020 2019 Segment profit (loss): Networking Platforms $ 168,270 $ 136,590 Platform Software and Services 28,951 20,464 Blue Planet Automation Software and Services (3,113 ) (2,047 ) Global Services 45,527 39,701 Total segment profit 239,635 194,708 Less: Non-performance operating expenses Selling and marketing 107,066 98,113 General and administrative 42,468 39,243 Amortization of intangible assets 5,853 5,528 Significant asset impairments and restructuring costs 4,472 2,273 Acquisition and integration costs 1,819 1,608 Add: Other non-performance financial items Interest expense and other income, net (5,169 ) (5,188 ) Loss on extinguishment and modification of debt (646 ) — Less: Provision for income taxes 9,814 9,139 Consolidated net income $ 62,328 $ 33,616
Schedule of Ciena's Geographic Distribution of Revenue and Long-Lived Assets	For the periods below, Ciena’s geographic distribution of equipment, building, furniture and fixtures, net, was as follows (in thousands): January 31, October 31, Canada $ 209,101 $ 211,901 United States 51,819 58,119 Other International 16,819 16,864 Total $ 277,739 $ 286,884 Quarter Ended January 31, 2020 2019 Americas $ 574,004 $ 516,481 EMEA 129,965 129,190 APAC 128,943 132,856 Total $ 832,912 $ 778,527
Schedule of Revenue by Major Customers	For the periods below, the only customers that accounted for at least 10% of Ciena’s revenue were as follows (in thousands): Quarter Ended January 31, 2020 2019 Verizon $ 114,548 $ 88,775 AT&T 84,010 94,172 Web-scale provider n/a 89,514 Total $ 198,558 $ 272,461 n/a Denotes revenue representing less than 10% of total revenue for the period

Significant Accounting Polici_4

Significant Accounting Policies - Opening Balance Adjustments (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Nov. 01, 2019	Oct. 31, 2019	Jan. 31, 2019
ASSETS
Operating right-of-use assets	$ 50,148	$ 53,334
Total assets	3,830,887	3,946,680	$ 3,893,346
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accrued liabilities and other short-term obligations	273,305	381,256	382,740
Operating lease liabilities	18,623	20,498
Other long-term obligations	125,607	127,503	148,747
Long-term operating lease liabilities	53,333	55,564
Total liabilities and stockholders’ equity	3,830,887	3,946,680	$ 3,893,346
Short-term restructuring reserve liability	2,232			$ 1,376
Long-term restructuring reserve liability	$ 0			$ 1,187
Accounting Standards Update 2016-02
ASSETS
Operating right-of-use assets		53,334
Total assets		53,334
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accrued liabilities and other short-term obligations		(1,484)
Operating lease liabilities		20,498
Other long-term obligations		(21,244)
Long-term operating lease liabilities		55,564
Total liabilities and stockholders’ equity		53,334
Operating right-of-use assets before adjustments		76,000
Deferred rent		(5,400)
Tenant improvement allowances		(6,200)
Short-term restructuring reserve liability		(1,500)
Long-term restructuring reserve liability		$ (9,600)

Significant Accounting Polici_5

Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Nov. 01, 2019	Oct. 31, 2019	Jan. 31, 2019	Oct. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating right-of-use assets	$ 50,148	$ 53,334
Operating lease liabilities	71,956	$ 76,000
Restructuring reserve	$ 2,232		$ 15,143	$ 2,563	$ 3,847
Consolidation of excess facilities and other restructuring activities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring reserve			$ 11,100

Revenue - Disaggregation of Re

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 832,912	$ 778,527
Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	680,104	646,404
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	152,808	132,123
Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	591,549	548,997
Packet Networking
Disaggregation of Revenue [Line Items]
Total revenue	67,508	71,569
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	51,888	41,598
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	15,466	14,974
Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	61,793	61,277
Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	34,954	30,622
Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	9,754	9,490
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	832,912	778,527
Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	659,057	620,566
Networking Platforms | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	659,057	620,566
Networking Platforms | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	659,057	620,566
Networking Platforms | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	591,549	548,997
Networking Platforms | Operating Segments | Packet Networking
Disaggregation of Revenue [Line Items]
Total revenue	67,508	71,569
Networking Platforms | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	51,888	41,598
Platform Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	13,114	16,044
Platform Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	38,774	25,554
Platform Software and Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	51,888	41,598
Platform Software and Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Operating Segments | Packet Networking
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	51,888	41,598
Platform Software and Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	15,466	14,974
Blue Planet Automation Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	3,736	6,228
Blue Planet Automation Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	11,730	8,746
Blue Planet Automation Software and Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	15,466	14,974
Blue Planet Automation Software and Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Packet Networking
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	15,466	14,974
Blue Planet Automation Software and Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services
Disaggregation of Revenue [Line Items]
Total revenue	106,501	101,389
Global Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	4,197	3,566
Global Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	102,304	97,823
Global Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	106,501	101,389
Global Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Operating Segments | Packet Networking
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	61,793	61,277
Global Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	34,954	30,622
Global Services | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	$ 9,754	$ 9,490

Revenue - Geographical Distribu

Revenue - Geographical Distribution of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 832,912	$ 778,527
Americas
Disaggregation of Revenue [Line Items]
Total revenue	574,004	516,481
EMEA
Disaggregation of Revenue [Line Items]
Total revenue	129,965	129,190
APAC
Disaggregation of Revenue [Line Items]
Total revenue	$ 128,943	$ 132,856

Revenue - Contract Balances (De

Revenue - Contract Balances (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Oct. 31, 2019
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 655,105	$ 724,854
Contract assets	83,717	84,046
Deferred revenue	$ 166,835	$ 156,873

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue recognized that was previously deferred	$ 49	$ 39.4
Capitalized contract acquisition costs	13.1		$ 15.7
Amortization of capitalized contract acquisition costs	5.6	$ 4.1
Remaining performance obligation	$ 905

Revenue - Performance Obligatio

Revenue - Performance Obligation (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-02-01	Jan. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of remaining performance obligation	82.00%
Period of remaining performance obligation	12 months

Business Combinations - Narrati

Business Combinations - Narrative (Details) - USD ($) $ in Thousands	Nov. 02, 2019	Jan. 31, 2020	Jan. 31, 2019
Business Acquisition [Line Items]
Acquisition and integration costs		$ 1,819	$ 1,608
Centina Systems, Inc.
Business Acquisition [Line Items]
Cash transaction for acquisition	$ 34,000
Acquisition and integration costs		$ 500
Customer relationships and contracts | Centina Systems, Inc.
Business Acquisition [Line Items]
Estimated useful lives	2 years
Developed technology | Centina Systems, Inc.
Business Acquisition [Line Items]
Estimated useful lives	5 years

Business Combinations - Purchas

Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Nov. 02, 2019	Oct. 31, 2019
Business Acquisition [Line Items]
Goodwill	$ 310,913		$ 297,937
Centina Systems, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents		$ 5,718
Accounts receivable		610
Prepaid expenses and other		536
Equipment, furniture and fixtures		17
Goodwill		13,055
Accounts payable		(47)
Accrued liabilities		(286)
Deferred revenue		(1,493)
Deferred tax liability		(6,692)
Total purchase consideration		34,018
Customer relationships and contracts | Centina Systems, Inc.
Business Acquisition [Line Items]
Intangible assets		400
Developed technology | Centina Systems, Inc.
Business Acquisition [Line Items]
Intangible assets		$ 22,200

Restructuring Costs (Details)

Restructuring Costs (Details) $ in Thousands	3 Months Ended
	Jan. 31, 2020USD ($)employee	Jan. 31, 2019USD ($)employee
Activity and balance of the restructuring liability accounts
Balance at beginning of period	$ 15,143	$ 3,847
Charges	4,472	2,273
Adjustments related to ASC 842	(11,160)
Cash payments	(6,223)	(3,557)
Balance at end of period	2,232	2,563
Current restructuring liabilities	2,232	1,376
Non-current restructuring liabilities	0	1,187
Workforce reduction
Activity and balance of the restructuring liability accounts
Balance at beginning of period	3,983	2,108
Charges	1,204	1,752
Adjustments related to ASC 842	0
Cash payments	(2,955)	(3,009)
Balance at end of period	2,232	851
Current restructuring liabilities	2,232	851
Non-current restructuring liabilities	$ 0	$ 0
Number of employee reduction | employee	22	10
Consolidation of excess facilities and other restructuring activities
Activity and balance of the restructuring liability accounts
Balance at beginning of period	$ 11,160	$ 1,739
Charges	3,268	521
Adjustments related to ASC 842	(11,160)
Cash payments	(3,268)	(548)
Balance at end of period	0	1,712
Current restructuring liabilities	0	525
Non-current restructuring liabilities	$ 0	$ 1,187

Interest and Other Income, Ne_2

Interest and Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Other Income and Expenses [Abstract]
Interest income	$ 3,390	$ 3,872
Gains on non-hedge designated foreign currency forward contracts	637	22
Foreign currency exchange gains (losses)	(771)	783
Other	390	(424)
Interest and other income, net	$ 3,646	$ 4,253

Short-Term and Long-Term Inve_3

Short-Term and Long-Term Investments - Components of Investments (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Oct. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 120,035
Estimated Fair Value	120,143
U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	120,035	$ 119,732
Gross Unrealized Gains	108	225
Gross Unrealized Losses	0	(3)
Estimated Fair Value	120,143	119,954
Included in short-term investments | U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	109,962	109,715
Gross Unrealized Gains	105	225
Gross Unrealized Losses	0	0
Estimated Fair Value	110,067	109,940
Included in long-term investments | U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,073	10,017
Gross Unrealized Gains	3	0
Gross Unrealized Losses	0	(3)
Estimated Fair Value	$ 10,076	$ 10,014

Short-Term and Long-Term Inve_4

Short-Term and Long-Term Investments - Legal Maturities of Debt Investments (Details) $ in Thousands	Jan. 31, 2020USD ($)
Amortized Cost
Less than one year	$ 109,962
Due in 1-2 years	10,073
Amortized Cost	120,035
Estimated Fair Value
Less than one year	110,067
Due in 1-2 years	10,076
Total	$ 120,143

- Fair Value Measurements (Deta

- Fair Value Measurements (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Oct. 31, 2019
Assets:
Debt securities	$ 120,143
Liabilities:
Contingent consideration	3,700
Fair value, Measurements, Recurring
Assets:
Money market funds	632,620	$ 759,114
Total assets measured at fair value	803,216	880,638
Liabilities:
Contingent consideration	3,705	3,705
Total liabilities measured at fair value	26,640	24,833
Fair value, Measurements, Recurring | Level 1
Assets:
Money market funds	632,620	759,114
Total assets measured at fair value	682,800	759,114
Liabilities:
Contingent consideration	0	0
Total liabilities measured at fair value	0	0
Fair value, Measurements, Recurring | Level 2
Assets:
Money market funds	0	0
Total assets measured at fair value	120,416	121,524
Liabilities:
Contingent consideration	0	0
Total liabilities measured at fair value	22,935	21,128
Fair value, Measurements, Recurring | Level 3
Assets:
Money market funds	0	0
Total assets measured at fair value	0	0
Liabilities:
Contingent consideration	3,705	3,705
Total liabilities measured at fair value	3,705	3,705
Foreign Currency Forward Contracts | Fair value, Measurements, Recurring
Assets:
Derivative asset	273	1,570
Liabilities:
Derivative liability	710	35
Foreign Currency Forward Contracts | Fair value, Measurements, Recurring | Level 1
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Foreign Currency Forward Contracts | Fair value, Measurements, Recurring | Level 2
Assets:
Derivative asset	273	1,570
Liabilities:
Derivative liability	710	35
Foreign Currency Forward Contracts | Fair value, Measurements, Recurring | Level 3
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Forward Starting Interest Rate Swaps
Liabilities:
Derivative liability		21,093
Forward Starting Interest Rate Swaps | Fair value, Measurements, Recurring
Liabilities:
Derivative liability	22,225
Forward Starting Interest Rate Swaps | Fair value, Measurements, Recurring | Level 1
Liabilities:
Derivative liability	0	0
Forward Starting Interest Rate Swaps | Fair value, Measurements, Recurring | Level 2
Liabilities:
Derivative liability	22,225	21,093
Forward Starting Interest Rate Swaps | Fair value, Measurements, Recurring | Level 3
Liabilities:
Derivative liability	0	0
Bond mutual fund | Fair value, Measurements, Recurring
Assets:
Debt securities	50,180
Bond mutual fund | Fair value, Measurements, Recurring | Level 1
Assets:
Debt securities	50,180
Bond mutual fund | Fair value, Measurements, Recurring | Level 2
Assets:
Debt securities	0
Bond mutual fund | Fair value, Measurements, Recurring | Level 3
Assets:
Debt securities	0
U.S. government obligations | Fair value, Measurements, Recurring
Assets:
Debt securities	120,143	119,954
U.S. government obligations | Fair value, Measurements, Recurring | Level 1
Assets:
Debt securities	0	0
U.S. government obligations | Fair value, Measurements, Recurring | Level 2
Assets:
Debt securities	120,143	119,954
U.S. government obligations | Fair value, Measurements, Recurring | Level 3
Assets:
Debt securities	$ 0	$ 0

Fair Value Measurements - Conde

Fair Value Measurements - Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2018	Jan. 31, 2020	Oct. 31, 2019
Liabilities:
Contingent consideration		$ 3,700
Contingent consideration term	3 years
Fair value, Measurements, Recurring
Assets:
Total assets measured at fair value		803,216	$ 880,638
Liabilities:
Total liabilities measured at fair value		26,640	24,833
Contingent consideration		3,705	3,705
Fair value, Measurements, Recurring | Cash equivalents
Assets:
Cash equivalents		682,800	759,114
Fair value, Measurements, Recurring | Short-term investments
Assets:
Short-term investments		110,067	109,940
Fair value, Measurements, Recurring | Prepaid expenses and other
Assets:
Prepaid expenses and other		273	1,570
Fair value, Measurements, Recurring | Long-term investments
Assets:
Long-term investments		10,076	10,014
Fair value, Measurements, Recurring | Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations		4,415	35
Fair value, Measurements, Recurring | Other long-term obligations
Liabilities:
Other long-term obligations		22,225	24,798
Fair value, Measurements, Recurring | Level 1
Assets:
Total assets measured at fair value		682,800	759,114
Liabilities:
Total liabilities measured at fair value		0	0
Contingent consideration		0	0
Fair value, Measurements, Recurring | Level 1 | Cash equivalents
Assets:
Cash equivalents		682,800	759,114
Fair value, Measurements, Recurring | Level 1 | Short-term investments
Assets:
Short-term investments		0	0
Fair value, Measurements, Recurring | Level 1 | Prepaid expenses and other
Assets:
Prepaid expenses and other		0	0
Fair value, Measurements, Recurring | Level 1 | Long-term investments
Assets:
Long-term investments		0	0
Fair value, Measurements, Recurring | Level 1 | Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations		0	0
Fair value, Measurements, Recurring | Level 1 | Other long-term obligations
Liabilities:
Other long-term obligations		0	0
Fair value, Measurements, Recurring | Level 2
Assets:
Total assets measured at fair value		120,416	121,524
Liabilities:
Total liabilities measured at fair value		22,935	21,128
Contingent consideration		0	0
Fair value, Measurements, Recurring | Level 2 | Cash equivalents
Assets:
Cash equivalents		0	0
Fair value, Measurements, Recurring | Level 2 | Short-term investments
Assets:
Short-term investments		110,067	109,940
Fair value, Measurements, Recurring | Level 2 | Prepaid expenses and other
Assets:
Prepaid expenses and other		273	1,570
Fair value, Measurements, Recurring | Level 2 | Long-term investments
Assets:
Long-term investments		10,076	10,014
Fair value, Measurements, Recurring | Level 2 | Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations		710	35
Fair value, Measurements, Recurring | Level 2 | Other long-term obligations
Liabilities:
Other long-term obligations		22,225	21,093
Fair value, Measurements, Recurring | Level 3
Assets:
Total assets measured at fair value		0	0
Liabilities:
Total liabilities measured at fair value		3,705	3,705
Contingent consideration		3,705	3,705
Fair value, Measurements, Recurring | Level 3 | Cash equivalents
Assets:
Cash equivalents		0	0
Fair value, Measurements, Recurring | Level 3 | Short-term investments
Assets:
Short-term investments		0	0
Fair value, Measurements, Recurring | Level 3 | Prepaid expenses and other
Assets:
Prepaid expenses and other		0	0
Fair value, Measurements, Recurring | Level 3 | Long-term investments
Assets:
Long-term investments		0	0
Fair value, Measurements, Recurring | Level 3 | Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations		3,705	0
Fair value, Measurements, Recurring | Level 3 | Other long-term obligations
Liabilities:
Other long-term obligations		$ 0	$ 3,705

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 106,522		$ 99,041
Work-in-process	11,728		13,657
Finished goods	219,907		226,622
Deferred cost of goods sold	49,256		53,051
Gross inventories	387,413		392,371
Provision for excess and obsolescence	(44,740)		(47,322)
Inventories, net	342,673		$ 345,049
Provisions	$ 6,699	$ 4,673

Prepaid Expenses and Other (Det

Prepaid Expenses and Other (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019
Capitalized Contract Cost [Line Items]
Prepaid VAT and other taxes	$ 87,706		$ 84,706
Prepaid expenses	65,806		48,680
Product demonstration equipment, net	37,866		38,900
Other non-trade receivables	36,236		28,136
Deferred deployment expense	318		125
Derivative assets	273		1,570
Restricted cash	0		74
Prepaid expenses and other	321,313		297,914
Depreciation of product demonstration equipment	2,200	$ 2,200
Contract assets for unbilled accounts receivable
Capitalized Contract Cost [Line Items]
Contract assets	83,717		84,046
Capitalized contract acquisition costs
Capitalized Contract Cost [Line Items]
Contract assets	$ 9,391		$ 11,677

Other Balance Sheet Details (De

Other Balance Sheet Details (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Nov. 01, 2019	Oct. 31, 2019	Jan. 31, 2019	Oct. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Compensation, payroll related tax and benefits	$ 68,924		$ 182,363
Warranty	51,190		48,498	$ 44,448	$ 44,740
Vacation	22,708		22,290
Contingent consideration	3,705		4,372
Contingent compensation	2,880		0
Finance lease obligations	2,710
Finance lease obligations			2,764
Interest payable	717		1,007
Other	120,471		121,446
Total accrued liabilities and other short-term obligations	$ 273,305	$ 381,256	$ 382,740

Other Balance Sheet Details - A

Other Balance Sheet Details - Accrued Warranty (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning Balance	$ 48,498	$ 44,740
Current Period Provisions	7,898	3,891
Settlements	(5,206)	(4,183)
Ending Balance	$ 51,190	$ 44,448

Derivative Instruments (Details

Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Oct. 31, 2019
Foreign Currency Forward Contracts | Designated as hedging instrument | Cash flow hedging
Derivative [Line Items]
Derivative asset, notional amount	$ 180.4	$ 197.4
Derivative maturity (in months)	24 months
Foreign Currency Forward Contracts | Not designated as hedging instrument
Derivative [Line Items]
Derivative asset, notional amount	$ 187.7	206
Derivative maturity (in months)	12 months
Forward Starting Interest Rate Swaps | Designated as hedging instrument | Cash flow hedging | Secured debt | 2025 Term Loan
Derivative [Line Items]
Derivative asset, notional amount	$ 350	$ 350
Derivative, fixed interest rate	2.957%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income - beginning balance	$ 2,172,761
Other comprehensive loss before reclassifications	(5,707)	$ (5,740)
Amounts reclassified from AOCI	80	880
Accumulated other comprehensive income - ending balance	2,193,650
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income - beginning balance	(22,084)	(5,780)
Accumulated other comprehensive income - ending balance	(27,711)	(10,640)
Unrealized Gain/(Loss) on Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income - beginning balance	152	(425)
Other comprehensive loss before reclassifications	(86)	301
Amounts reclassified from AOCI	0	0
Accumulated other comprehensive income - ending balance	66	(124)
Unrealized Gain (Loss) Derivatives | Foreign Currency Forward Contracts
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income - beginning balance	925	(3,060)
Other comprehensive loss before reclassifications	(921)	402
Amounts reclassified from AOCI	(158)	1,158
Accumulated other comprehensive income - ending balance	(154)	(1,500)
Unrealized Gain (Loss) Derivatives | Forward Starting Interest Rate Swaps
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income - beginning balance	(13,686)	6,417
Other comprehensive loss before reclassifications	(1,718)	(7,593)
Amounts reclassified from AOCI	238	(278)
Accumulated other comprehensive income - ending balance	(15,166)	(1,454)
Cumulative Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income - beginning balance	(9,475)	(8,712)
Other comprehensive loss before reclassifications	(2,982)	1,150
Amounts reclassified from AOCI	0	0
Accumulated other comprehensive income - ending balance	$ (12,457)	$ (7,562)

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands, ft² in Millions	3 Months Ended
	Jan. 31, 2020USD ($)ft²	Jan. 31, 2019USD ($)	Oct. 31, 2019USD ($)	Oct. 31, 2018USD ($)
Lessee, Lease, Description [Line Items]
Area leased (in sq ft) | ft²	1.4
Remaining lease term (up to)	13 years
Extension term (up to)	10 years
Termination period (up to)	8 years
Restructuring reserve	$ 2,232	$ 2,563	$ 15,143	$ 3,847
Operating lease expense		6,800
Leasehold improvements
Lessee, Lease, Description [Line Items]
Amortization	$ 4,300	$ 2,400
Consolidation of excess facilities and other restructuring activities
Lessee, Lease, Description [Line Items]
Restructuring reserve			$ 11,100

Leases - Leases Included in the

Leases - Leases Included in the Balance Sheet (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Nov. 01, 2019
Operating leases:
Operating ROU Assets	$ 50,148	$ 53,334
Operating lease liabilities	71,956	$ 76,000
Finance leases:
Buildings, gross	71,235
Less: accumulated depreciation	(14,548)
Buildings, net	56,687
Finance lease liabilities	$ 66,831

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Leases [Abstract]
Operating lease costs	$ 4,457
Finance lease cost:
Amortization of finance ROU asset	1,140
Interest on finance lease liabilities	1,244
Total finance lease cost	2,384
Non-capitalized lease cost	621
Variable lease cost	1,311
Net lease cost	8,773
Leasehold improvements
Property, Plant and Equipment [Line Items]
Amortization	$ 4,300	$ 2,400

Leases - Leases Maturity (Detai

Leases - Leases Maturity (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Nov. 01, 2019
Operating Leases
Remaining fiscal 2020	$ 15,778
2021	18,261
2022	13,440
2023	10,157
2024	8,052
Thereafter	12,205
Total lease payments	77,893
Less: Imputed interest	(5,937)
Present value of lease liabilities	71,956	$ 76,000
Less: Current portion of present value of minimum lease payments	(18,623)	(20,498)
Long-term portion of present value of minimum lease payments	53,333	$ 55,564
Finance Leases
Remaining fiscal 2020	7,512
2021	7,491
2022	7,932
2023	8,008
2024	8,024
Thereafter	64,616
Total lease payments	103,583
Present value of lease liabilities	(36,752)
Present value of lease liabilities	66,831
Less: Current portion of present value of minimum lease payments	(2,710)
Long-term portion of present value of minimum lease payments	64,121
Lease, Liability, Payment, Due [Abstract]
Remaining fiscal 2020	23,290
2021	25,752
2022	21,372
2023	18,165
2024	16,076
Thereafter	76,821
Total lease payments	181,476
Less: Imputed interest	(42,689)
Present value of lease liabilities	138,787
Less: Current portion of present value of minimum lease payments	(21,333)
Long-term portion of present value of minimum lease payments	$ 117,454

Leases - Weighted Average Rema

Leases - Weighted Average Remaining Lease Terms and Discount Rates (Details)	Jan. 31, 2020
Weighted-average remaining lease term in years:
Operating leases	4 years 10 months 28 days
Finance leases	12 years 7 months 13 days
Weighted-average discount rates:
Operating leases	2.39%
Finance leases	7.56%

Leases - Minimum Aggregate Rent

Leases - Minimum Aggregate Rentals Under Operating Leases (Details) $ in Thousands	Oct. 31, 2019USD ($)
Leases [Abstract]
2020	$ 28,776
2021	24,184
2022	16,767
2023	13,393
2024	10,632
Thereafter	26,110
Total	$ 119,862

Short-Term and Long-Term Debt_2

Short-Term and Long-Term Debt (Details) - Secured debt - USD ($) $ in Thousands	Jan. 23, 2020	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019
Debt Instrument [Line Items]
Debt issuance costs, net		$ 3,400		$ 3,600
Amortization of debt issuance costs		200	$ 200
2025 Term Loan
Debt Instrument [Line Items]
Outstanding principal	$ 693,000	0
Debt issuance costs, net		0
New Term Loan 2025
Debt Instrument [Line Items]
Outstanding principal	693,000	693,000
Debt issuance costs for modification of debt	$ 100
Quarterly installments, percentage	0.25%
Quarterly installments	$ 1,730
Prepayment premium	1.00%
Debt issuance costs, net		$ 3,390
Fair value of debt	$ 694,700
LIBOR | New Term Loan 2025
Debt Instrument [Line Items]
Applicable margin	1.75%
Interest rate floor	0.00%
Base Rate | New Term Loan 2025
Debt Instrument [Line Items]
Applicable margin	0.75%
Interest rate floor	1.00%

Short-Term and Long-Term Debt -

Short-Term and Long-Term Debt - Debt Components (Details) - Secured debt - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 23, 2020	Oct. 31, 2019
Debt Instrument [Line Items]
Deferred Debt Issuance Costs	$ (3,400)		$ (3,600)
Term Loan Payable due September 28, 2025 (New)
Debt Instrument [Line Items]
Principal Balance	693,000	$ 693,000
Unamortized Debt Discount	(1,824)
Deferred Debt Issuance Costs	(3,390)
Net Carrying Value	687,786		0
Term Loan Payable due September 28, 2025 (Old)
Debt Instrument [Line Items]
Principal Balance	0	$ 693,000
Unamortized Debt Discount	0
Deferred Debt Issuance Costs	0
Net Carrying Value	$ 0		$ 687,406

Earnings Per Share Calculatio_2

Earnings Per Share Calculation - Earnings Per Share Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Numerator
Net income used to calculate Basic and Diluted EPS	$ 62,328	$ 33,616
Denominator
Basic weighted average shares outstanding (in shares)	154,334	156,314
Add: Shares underlying outstanding stock options and restricted stock units and issuable under employee stock purchase plan (in shares)	1,404	1,860
Dilutive weighted average shares outstanding (in shares)	155,738	158,174
EPS
Basic EPS (in dollars per share)	$ 0.40	$ 0.22
Diluted EPS (in dollars per share)	$ 0.40	$ 0.21

Earnings Per Share Calculatio_3

Earnings Per Share Calculation - Antidilutive Securities Excluded (Details) - shares shares in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total excluded due to anti-dilutive effect (in shares)	731	401
Shares underlying stock options and stock unit awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total excluded due to anti-dilutive effect (in shares)	731	401

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($)	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Dec. 13, 2018
Equity [Abstract]
Stock repurchase program authorized amount			$ 500,000,000
Payments for repurchase of common stock	$ 12,572,000	$ 10,026,000

Stockholders' Equity - Summary

Stockholders' Equity - Summary of the Stock Repurchase Program (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Jan. 31, 2020USD ($)$ / sharesshares
Shares Repurchased
Cumulative beginning balance (in shares) | shares	3,838,466
Repurchase of common stock under the stock repurchase program (in shares) | shares	1,288,111
Cumulative ending balance (in shares) | shares	5,126,577
Weighted-Average Price per Share
Cumulative beginning balance (in dollars per share) | $ / shares	$ 39.10
Repurchase of common stock under the stock repurchase program (in dollars per share) | $ / shares	39.36
Cumulative ending balance (in dollars per share) | $ / shares	$ 39.16
Amount Repurchased (in thousands)
Cumulative beginning balance | $	$ 150,076
Repurchase of common stock under the stock repurchase program | $	50,704
Cumulative ending balance | $	$ 200,780

Share-Based Compensation Expe_3

Share-Based Compensation Expense - Expense in Period (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense capitalized in inventory, net	$ 100	$ 60
Total share-based compensation	15,602	13,755
Cost of Sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	1,513	1,407
Product costs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	671	637
Service costs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	842	770
Operating Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	13,989	12,288
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	3,849	3,391
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	4,613	3,785
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 5,527	$ 5,112

Share-Based Compensation Expe_4

Share-Based Compensation Expense (Details) - Restricted stock units (RSUs) $ in Millions	3 Months Ended
	Jan. 31, 2020USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation	$ 141.7
Weighted-average period for recognition of share-based compensation (in years)	1 year 8 months 12 days

Segments and Entity-Wide Disc_3

Segments and Entity-Wide Disclosures (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Jan. 31, 2020USD ($)region	Jan. 31, 2019USD ($)	Oct. 31, 2019USD ($)segment	Nov. 01, 2019USD ($)
Segment Reporting Information [Line Items]
Equipment, building, furniture and fixtures, net	$ 277,739
Operating right-of-use assets	50,148			$ 53,334
Goodwill	$ 310,913		$ 297,937
Number of geographic regions | region	3
Net revenue	$ 832,912	$ 778,527
United States
Segment Reporting Information [Line Items]
Equipment, building, furniture and fixtures, net	51,819
Net revenue	524,300	464,100
Software and Software-Related Services
Segment Reporting Information [Line Items]
Number of operating segments | segment			2
Networking Platforms
Segment Reporting Information [Line Items]
Net revenue	659,057	620,566
Platform Software and Services
Segment Reporting Information [Line Items]
Net revenue	51,888	41,598
Blue Planet Automation Software and Services
Segment Reporting Information [Line Items]
Net revenue	15,466	14,974
Global Services
Segment Reporting Information [Line Items]
Net revenue	106,501	101,389
Operating Segments
Segment Reporting Information [Line Items]
Net revenue	832,912	778,527
Operating Segments | Networking Platforms
Segment Reporting Information [Line Items]
Intangible assets, net	17,900
Goodwill	65,700
Net revenue	659,057	620,566
Operating Segments | Platform Software and Services
Segment Reporting Information [Line Items]
Goodwill	156,200
Net revenue	51,888	41,598
Operating Segments | Blue Planet Automation Software and Services
Segment Reporting Information [Line Items]
Intangible assets, net	107,700
Goodwill	89,000
Net revenue	15,466	14,974
Operating Segments | Global Services
Segment Reporting Information [Line Items]
Maintenance spares, net	54,900
Net revenue	$ 106,501	$ 101,389

Segments and Entity-Wide Disc_4

Segments and Entity-Wide Disclosures - Revenue, Profit (Loss) and Net Income (Loss) Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Revenue:
Total revenue	$ 832,912	$ 778,527
Less: Non-performance operating expenses
Selling and marketing	107,066	98,113
General and administrative	42,468	39,243
Amortization of intangible assets	5,853	5,528
Significant asset impairments and restructuring costs	4,472	2,273
Acquisition and integration costs	1,819	1,608
Add: Other non-performance financial items
Interest expense and other income, net	(5,169)	(5,188)
Loss on extinguishment and modification of debt	(646)	0
Less: Provision for income taxes	9,814	9,139
Net income	62,328	33,616
Networking Platforms
Revenue:
Total revenue	659,057	620,566
Platform Software and Services
Revenue:
Total revenue	51,888	41,598
Blue Planet Automation Software and Services
Revenue:
Total revenue	15,466	14,974
Global Services
Revenue:
Total revenue	106,501	101,389
Operating Segments
Revenue:
Total revenue	832,912	778,527
Add: Other non-performance financial items
Net income	239,635	194,708
Operating Segments | Networking Platforms
Revenue:
Total revenue	659,057	620,566
Add: Other non-performance financial items
Net income	168,270	136,590
Operating Segments | Platform Software and Services
Revenue:
Total revenue	51,888	41,598
Add: Other non-performance financial items
Net income	28,951	20,464
Operating Segments | Blue Planet Automation Software and Services
Revenue:
Total revenue	15,466	14,974
Add: Other non-performance financial items
Net income	(3,113)	(2,047)
Operating Segments | Global Services
Revenue:
Total revenue	106,501	101,389
Add: Other non-performance financial items
Net income	45,527	39,701
Converged Packet Optical
Revenue:
Total revenue	591,549	548,997
Converged Packet Optical | Operating Segments | Networking Platforms
Revenue:
Total revenue	591,549	548,997
Converged Packet Optical | Operating Segments | Platform Software and Services
Revenue:
Total revenue	0	0
Converged Packet Optical | Operating Segments | Blue Planet Automation Software and Services
Revenue:
Total revenue	0	0
Converged Packet Optical | Operating Segments | Global Services
Revenue:
Total revenue	0	0
Packet Networking
Revenue:
Total revenue	67,508	71,569
Packet Networking | Operating Segments | Networking Platforms
Revenue:
Total revenue	67,508	71,569
Packet Networking | Operating Segments | Platform Software and Services
Revenue:
Total revenue	0	0
Packet Networking | Operating Segments | Blue Planet Automation Software and Services
Revenue:
Total revenue	0	0
Packet Networking | Operating Segments | Global Services
Revenue:
Total revenue	0	0
Platform Software and Services
Revenue:
Total revenue	51,888	41,598
Platform Software and Services | Operating Segments | Networking Platforms
Revenue:
Total revenue	0	0
Platform Software and Services | Operating Segments | Platform Software and Services
Revenue:
Total revenue	51,888	41,598
Platform Software and Services | Operating Segments | Blue Planet Automation Software and Services
Revenue:
Total revenue	0	0
Platform Software and Services | Operating Segments | Global Services
Revenue:
Total revenue	0	0
Blue Planet Automation Software and Services
Revenue:
Total revenue	15,466	14,974
Blue Planet Automation Software and Services | Operating Segments | Networking Platforms
Revenue:
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Platform Software and Services
Revenue:
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Blue Planet Automation Software and Services
Revenue:
Total revenue	15,466	14,974
Blue Planet Automation Software and Services | Operating Segments | Global Services
Revenue:
Total revenue	0	0
Maintenance Support and Training
Revenue:
Total revenue	61,793	61,277
Maintenance Support and Training | Operating Segments | Networking Platforms
Revenue:
Total revenue	0	0
Maintenance Support and Training | Operating Segments | Platform Software and Services
Revenue:
Total revenue	0	0
Maintenance Support and Training | Operating Segments | Blue Planet Automation Software and Services
Revenue:
Total revenue	0	0
Maintenance Support and Training | Operating Segments | Global Services
Revenue:
Total revenue	61,793	61,277
Installation and Deployment
Revenue:
Total revenue	34,954	30,622
Installation and Deployment | Operating Segments | Networking Platforms
Revenue:
Total revenue	0	0
Installation and Deployment | Operating Segments | Platform Software and Services
Revenue:
Total revenue	0	0
Installation and Deployment | Operating Segments | Blue Planet Automation Software and Services
Revenue:
Total revenue	0	0
Installation and Deployment | Operating Segments | Global Services
Revenue:
Total revenue	34,954	30,622
Consulting and Network Design
Revenue:
Total revenue	9,754	9,490
Consulting and Network Design | Operating Segments | Networking Platforms
Revenue:
Total revenue	0	0
Consulting and Network Design | Operating Segments | Platform Software and Services
Revenue:
Total revenue	0	0
Consulting and Network Design | Operating Segments | Blue Planet Automation Software and Services
Revenue:
Total revenue	0	0
Consulting and Network Design | Operating Segments | Global Services
Revenue:
Total revenue	$ 9,754	$ 9,490

Segments and Entity-Wide Disc_5

Segments and Entity-Wide Disclosures - Revenue, Geographic Distribution (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 832,912	$ 778,527
Americas
Segment Reporting Information [Line Items]
Total revenue	574,004	516,481
EMEA
Segment Reporting Information [Line Items]
Total revenue	129,965	129,190
APAC
Segment Reporting Information [Line Items]
Total revenue	$ 128,943	$ 132,856

Segments and Entity-Wide Disc_6

Segments and Entity-Wide Disclosures - Geographic Distribution of Equipment, Building, Furniture and Fixtures (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Oct. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net		$ 286,884
Equipment, building, furniture and fixtures, net	$ 277,739
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net		211,901
Equipment, building, furniture and fixtures, net	209,101
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net		58,119
Equipment, building, furniture and fixtures, net	51,819
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net		$ 16,864
Equipment, building, furniture and fixtures, net	$ 16,819

Segments and Entity-Wide Disc_7

Segments and Entity-Wide Disclosures - Revenue by Major Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Revenue, Major Customer [Line Items]
Total revenue	$ 832,912	$ 778,527
Customer concentration risk
Revenue, Major Customer [Line Items]
Total revenue	198,558	272,461
Verizon | Customer concentration risk
Revenue, Major Customer [Line Items]
Total revenue	114,548	88,775
Verizon | Customer concentration risk
Revenue, Major Customer [Line Items]
Total revenue	$ 84,010	94,172
Web-scale provider | Customer concentration risk
Revenue, Major Customer [Line Items]
Total revenue		$ 89,514

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands, $ in Millions	3 Months Ended			35 Months Ended
	Jan. 31, 2020USD ($)government_entity	Jan. 31, 2020CAD ($)government_entity	Jan. 31, 2019USD ($)	Jan. 31, 2020USD ($)	Jan. 31, 2020CAD ($)	Jan. 31, 2020CAD ($)
Loss Contingencies [Line Items]
Maximum amount of Canadian grant	$ 43,500			$ 43,500		$ 57.6
Number of Canadian government entities | government_entity	3	3
Total revenue | $	$ 832,912		$ 778,527
Amounts receivable from grant	9,100			9,100		$ 12
Grants
Loss Contingencies [Line Items]
Total revenue	$ 2,700	$ 3.6		$ 24,600	$ 32.5

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 06, 2020	Jan. 31, 2020	Oct. 31, 2019
Subsequent Event [Line Items]
Stock repurchases (in shares)		1,288,111
Stock repurchases		$ 50,704
Average price of shares repurchased (in dollars per share)		$ 39.36
Aggregate shares repurchased (in shares)		5,126,577	3,838,466
Subsequent event
Subsequent Event [Line Items]
Stock repurchases (in shares)	443,958
Stock repurchases	$ 18,600
Average price of shares repurchased (in dollars per share)	$ 41.90
Aggregate shares repurchased (in shares)	5,570,535
Authorized funds remaining under stock repurchase program	$ 280,600

Uncategorized Items - a20200131

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 49,805,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	49,805,000
Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 0