Ciena (CIEN) 10-Q 9 Jun 21 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	May 01, 2021	Jun. 04, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	May 1, 2021
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, par value $0.01 per share
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		154,767,152
Entity Central Index Key	0000936395
Current Fiscal Year End Date	--10-30
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020
Revenue:
Total revenue	$ 833,927	$ 894,053	$ 1,591,057	$ 1,726,965
Cost of goods sold:
Total cost of goods sold	421,508	480,727	820,747	943,104
Gross profit	412,419	413,326	770,310	783,861
Operating expenses:
Research and development	110,246	131,530	242,987	262,430
Selling and marketing	110,387	101,214	207,665	208,280
General and administrative	43,635	42,030	83,628	84,498
Amortization of intangible assets	6,019	5,839	11,929	11,692
Significant asset impairments and restructuring costs	8,209	3,811	14,076	8,283
Acquisition and integration costs	294	1,414	601	3,233
Total operating expenses	278,790	285,838	560,886	578,416
Income from operations	133,629	127,488	209,424	205,445
Interest and other income (loss), net	(1,274)	(2,665)	(2,395)	981
Interest expense	(7,785)	(7,860)	(15,145)	(16,675)
Loss on extinguishment and modification of debt	0	0	0	(646)
Income before income taxes	124,570	116,963	191,884	189,105
Provision for income taxes	21,453	25,308	33,419	35,122
Net income	$ 103,117	$ 91,655	$ 158,465	$ 153,983
Basic net income per common share (in dollars per share)	$ 0.66	$ 0.60	$ 1.02	$ 1
Diluted net income per potential common share (in dollars per share)	$ 0.66	$ 0.59	$ 1.01	$ 0.99
Weighted average basic common shares outstanding (in shares)	155,331	153,858	155,257	154,099
Weighted average dilutive potential common shares outstanding (in shares)	156,876	155,141	156,734	155,443
Products
Revenue:
Total revenue	$ 670,043	$ 739,892	$ 1,267,263	$ 1,427,107
Cost of goods sold:
Total cost of goods sold	339,601	405,138	654,699	794,151
Services
Revenue:
Total revenue	163,884	154,161	323,794	299,858
Cost of goods sold:
Total cost of goods sold	$ 81,907	$ 75,589	$ 166,048	$ 148,953

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income Gain (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020
Net income	$ 103,117	$ 91,655	$ 158,465	$ 153,983
Change in unrealized gain (loss) on available-for-sale securities, net of tax	42	396	(7)	310
Change in cumulative translation adjustments	10,400	(18,508)	26,261	(21,490)
Other comprehensive gain (loss)	16,908	(33,675)	40,719	(39,302)
Total comprehensive income	120,025	57,980	199,184	114,681
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	3,817	(6,940)	10,434	(8,019)
Change in unrealized gain (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	$ 2,649	$ (8,623)	$ 4,031	$ (10,103)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020
Current assets:
Cash and cash equivalents	$ 1,202,974	$ 1,088,624
Short-term investments	151,816	150,667
Accounts receivable, net of allowance for credit losses of $10.4 million and $10.6 million as of May 1, 2021 and October 31, 2020, respectively.	716,779	719,405
Inventories, net	401,233	344,379
Prepaid expenses and other	321,651	308,084
Total current assets	2,794,453	2,611,159
Long-term investments	91,715	82,226
Equipment, building, furniture and fixtures, net	298,329	272,377
Operating right-of-use assets	50,997	57,026
Goodwill	311,734	310,847
Other intangible assets, net	82,879	96,647
Deferred tax asset, net	653,922	647,805
Other long-term assets	103,984	102,830
Total assets	4,388,013	4,180,917
Current liabilities:
Accounts payable	279,247	291,904
Accrued liabilities and other short-term obligations	330,060	334,132
Deferred revenue	147,075	108,700
Operating lease liabilities	19,364	19,035
Current portion of long-term debt	6,930	6,930
Total current liabilities	782,676	760,701
Long-term deferred revenue	57,224	49,663
Other long-term obligations	127,700	123,185
Long-term operating lease liabilities	53,795	61,415
Long-term debt, net	673,355	676,356
Total liabilities	1,694,750	1,671,320
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; 154,962,122 and 154,563,005 shares issued and outstanding	1,550	1,546
Additional paid-in capital	6,813,215	6,826,531
Accumulated other comprehensive gain (loss)	5,361	(35,358)
Accumulated deficit	(4,126,863)	(4,283,122)
Total stockholders’ equity	2,693,263	2,509,597
Total liabilities and stockholders’ equity	$ 4,388,013	$ 4,180,917

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	May 01, 2021	Oct. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 10.4	$ 10.6
Stockholders’ equity:
Preferred stock par value per share (in dollars per share)	$ 0.01	$ 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)	154,962,122	154,563,005
Common stock shares outstanding (in shares)	154,962,122	154,563,005

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	May 01, 2021	May 02, 2020
Cash flows provided by operating activities:
Net income	$ 158,465	$ 153,983
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of equipment, building, furniture and fixtures, and amortization of leasehold improvements	47,295	48,381
Share-based compensation costs	40,499	33,579
Amortization of intangible assets	18,517	19,361
Deferred taxes	(9,606)	25,420
Provision for inventory excess and obsolescence	10,402	12,640
Provision for warranty	7,937	13,793
Other	5,928	16,190
Changes in assets and liabilities:
Accounts receivable	(180)	15,865
Inventories	(66,934)	5,618
Prepaid expenses and other	(8,565)	(54,839)
Operating lease right-of-use assets	8,253	8,642
Accounts payable, accruals and other obligations	(30,108)	(151,713)
Deferred revenue	45,482	(5,679)
Short- and long-term operating lease liabilities	(9,726)	(10,311)
Net cash provided by operating activities	217,659	130,930
Cash flows used in investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(51,651)	(45,458)
Purchase of available for sale securities	(102,429)	(40,894)
Proceeds from maturities of available for sale securities	91,810	60,000
Settlement of foreign currency forward contracts, net	9,414	(3,836)
Acquisition of business, net of cash acquired	0	(28,300)
Proceeds from sale of equity investment	4,678	0
Net cash used in investing activities	(48,178)	(58,488)
Cash flows used in financing activities:
Payment of long-term debt	(3,465)	(1,733)
Payment of debt issuance costs	0	(382)
Payment of finance lease obligations	(1,463)	(1,381)
Shares repurchased for tax withholdings on vesting of stock unit awards	(27,893)	(18,200)
Repurchases of common stock - repurchase program	(38,498)	(74,535)
Proceeds from issuance of common stock	13,480	12,290
Net cash used in financing activities	(57,839)	(83,941)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,696	(4,876)
Net increase (decrease) in cash, cash equivalents and restricted cash	114,338	(16,375)
Cash, cash equivalents and restricted cash at beginning of period	1,088,708	904,161
Cash, cash equivalents and restricted cash at end of period	1,203,046	887,786
Supplemental disclosure of cash flow information
Cash paid during the period for interest	14,949	17,590
Cash paid during the period for income taxes, net	27,666	22,011
Operating lease payments	10,785	11,409
Non-cash investing and financing activities
Purchase of equipment in accounts payable	4,966	4,480
Repurchase of common stock in accrued liabilities from repurchase program	900	0
Operating lease right-of-use assets subject to lease liability	$ 1,770	$ 4,887

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Changes in Stockholders’ Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Gain (Loss)	Accumulated Deficit	Accumulated DeficitCumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Nov. 02, 2019			154,403,850
Equity - beginning balance at Nov. 02, 2019	$ 2,172,761		$ 1,544	$ 6,837,714	$ (22,084)	$ (4,644,413)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	153,983					153,983
Other comprehensive loss	(39,302)				(39,302)
Repurchase of common stock - repurchase program (in shares)			(1,872,446)
Repurchase of common stock - repurchase program	(74,535)		$ (19)	(74,516)
Issuance of shares from employee equity plans (in shares)			1,562,899
Issuance of shares from employee equity plans	12,290		$ 16	12,274
Share-based compensation expense	33,579			33,579
Shares repurchased for tax withholdings on vesting of stock unit awards (in shares)			(452,738)
Shares repurchased for tax withholdings on vesting of stock unit awards	(18,200)		$ (5)	(18,195)
Ending balance (in shares) at May. 02, 2020			153,641,565
Equity- ending balance at May. 02, 2020	$ 2,240,576		$ 1,536	6,790,856	(61,386)	(4,490,430)
Beginning balance (in shares) at Oct. 31, 2020	154,563,005		154,563,005
Equity - beginning balance at Oct. 31, 2020	$ 2,509,597	$ (2,206)	$ 1,546	6,826,531	(35,358)	(4,283,122)	$ (2,206)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	158,465					158,465
Other comprehensive loss	40,719				40,719
Repurchase of common stock - repurchase program (in shares)			(735,075)
Repurchase of common stock - repurchase program	(39,398)		$ (8)	(39,390)
Issuance of shares from employee equity plans (in shares)			1,667,160
Issuance of shares from employee equity plans	13,480		$ 17	13,463
Share-based compensation expense	40,499			40,499
Shares repurchased for tax withholdings on vesting of stock unit awards (in shares)			(532,968)
Shares repurchased for tax withholdings on vesting of stock unit awards	$ (27,893)		$ (5)	(27,888)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Ending balance (in shares) at May. 01, 2021	154,962,122		154,962,122
Equity- ending balance at May. 01, 2021	$ 2,693,263		$ 1,550	$ 6,813,215	$ 5,361	$ (4,126,863)

Interim Financial Statements

Interim Financial Statements	6 Months Ended
	May 01, 2021
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”). The preparation of financial statements and related disclosures in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires Ciena to make judgments, assumptions, and estimates that affect the amounts reported in the Condensed Consolidated Financial Statements and accompanying notes. The inputs into certain of Ciena’s judgments, assumptions, and estimates reflect, among other things, the information available to Ciena regarding the economic implications of the COVID-19 pandemic, and expectations as to its impact on Ciena’s business. Among other things, these estimates form the basis for judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ materially from these estimates under different assumptions or conditions. To the extent that there are material differences between Ciena’s estimates and actual results, Ciena’s consolidated financial statements will be affected. In addition, including because the duration and severity of COVID-19 pandemic are uncertain, certain of such estimates could require further judgment or modification and therefore carry a higher degree of variability and volatility. As events continue to evolve, Ciena’s estimates may change materially in future periods. 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 GAAP have been condensed or omitted pursuant to SEC rules and regulations. The Condensed Consolidated Balance Sheet as of October 31, 2020 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 fiscal 2020 (the “2020 Annual Report”).

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	May 01, 2021
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 2020 Annual Report. Newly Issued Accounting Standards - Effective In June 2016, the Financial Accounting Standards Board (”FASB”) issued Accounting Standards Update 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. Ciena adopted ASU 2016-13 on a modified retrospective basis in the first quarter of fiscal year 2021 through a cumulative-effect adjustment at the beginning of the period of adoption and did not restate prior periods. The standard primarily impacts the value of Ciena’s accounts receivable, net and contract assets, net. Adoption of ASU 2016-13 did not have a material effect on Ciena’s financial position or results of operations. Ciena’s significant accounting policies updated as a result of adopting this standard are as follows: Allowance for Credit Losses for Accounts Receivable and Contract Assets Ciena estimates its allowances for credit losses using relevant available information from internal and external sources, related to past events, current conditions and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. When assessing for credit losses, Ciena determines collectability by pooling assets with similar characteristics. The allowances for credit losses are each measured on a collective basis when similar risk characteristics exist. The allowances for credit losses are each measured by multiplying the exposure probability of default, the probability the asset will default within a given time frame, by the loss given default rate, the percentage of the asset not expected to be collected due to default, based on the pool of assets. Probability of default rates are published by third-party credit rating agencies. Adjustments to Ciena’s exposure probability may take into account including, but not limited to, various customer-specific factors, the potential sovereign risk of the geographic locations in which the customer is operating and macroeconomic conditions. These factors are updated regularly or when facts and circumstances indicate that an update is deemed necessary. Newly Issued Accounting Standards - Not Yet Effective In March 2020, the FASB issued ASU No. 2020-04 ( “ASU 2020-04” ), Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting . ASU 2020-04 provides temporary optional guidance on contract modifications and hedging accounting to ease the financial reporting burdens of the expected market transition from the London Interbank Offered Rate (“LIBOR”) to alternative reference rates. In January 2021, the FASB issued ASU 2021-01, which refines the scope of Topic 848 and clarifies some of its guidance as part of the FASB’s monitoring of global reference rate activities. The new guidance was effective upon issuance, and Ciena is allowed to elect to apply the amendments prospectively through December 31, 2022. Ciena is currently evaluating the impact of this accounting standard update on its consolidated financial statements and related disclosures. In December 2019, the FASB issued ASU No. 2019-12 ( “ASU 2019-12”), Income Taxes (ASC 740): Simplifying the Accounting for Income Taxes

Revenue

Revenue	6 Months Ended
	May 01, 2021
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 lines, resulting in different economic risk profiles for each line. Effective as of the beginning of fiscal 2021, Ciena renamed its “Packet Networking” product line to “Routing and Switching.” This change, affecting only the presentation of such information, was made on a prospective basis and does not impact comparability of previous financial results. References to prior reported “Packet Networking” product line have been changed herein to“Routing and Switching.” The tables below set forth Ciena’s disaggregated revenue for the respective periods (in thousands): Quarter Ended May 1, 2021 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 573,657 $ — $ — $ — $ 573,657 Routing and Switching 63,628 — — — 63,628 Platform Software and Services — 56,688 — — 56,688 Blue Planet Automation Software and Services — — 23,958 — 23,958 Maintenance Support and Training — — — 70,418 70,418 Installation and Deployment — — — 37,999 37,999 Consulting and Network Design — — — 7,579 7,579 Total revenue by product line $ 637,285 $ 56,688 $ 23,958 $ 115,996 $ 833,927 Timing of revenue recognition: Products and services at a point in time $ 637,285 $ 20,765 $ 10,765 $ 1,411 $ 670,226 Services transferred over time — 35,923 13,193 114,585 163,701 Total revenue by timing of revenue recognition $ 637,285 $ 56,688 $ 23,958 $ 115,996 $ 833,927 Quarter Ended May 2, 2020 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 654,294 $ — $ — $ — $ 654,294 Routing and Switching 64,167 — — — 64,167 Platform Software and Services — 44,985 — — 44,985 Blue Planet Automation Software and Services — — 15,017 — 15,017 Maintenance Support and Training — — — 71,479 71,479 Installation and Deployment — — — 34,242 34,242 Consulting and Network Design — — — 9,869 9,869 Total revenue by product line $ 718,461 $ 44,985 $ 15,017 $ 115,590 $ 894,053 Timing of revenue recognition: Products and services at a point in time $ 718,461 $ 16,978 $ 4,745 $ 4,677 $ 744,861 Services transferred over time — 28,007 10,272 110,913 149,192 Total revenue by timing of revenue recognition $ 718,461 $ 44,985 $ 15,017 $ 115,590 $ 894,053 Six Months Ended May 1, 2021 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 1,085,981 $ — $ — $ — $ 1,085,981 Routing and Switching 127,934 — — — 127,934 Platform Software and Services — 106,527 — — 106,527 Blue Planet Automation Software and Services — — 40,892 — 40,892 Maintenance Support and Training — — — 138,049 138,049 Installation and Deployment — — — 77,610 77,610 Consulting and Network Design — — — 14,064 14,064 Total revenue by product line $ 1,213,915 $ 106,527 $ 40,892 $ 229,723 $ 1,591,057 Timing of revenue recognition: Products and services at a point in time $ 1,213,915 $ 36,828 $ 15,939 $ 3,268 $ 1,269,950 Services transferred over time — 69,699 24,953 226,455 321,107 Total revenue by timing of revenue recognition $ 1,213,915 $ 106,527 $ 40,892 $ 229,723 $ 1,591,057 Six Months Ended May 2, 2020 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 1,245,844 $ — $ — $ — $ 1,245,844 Routing Switching 131,675 — — — 131,675 Platform Software and Services — 96,873 — — 96,873 Blue Planet Automation Software and Services — — 30,482 — 30,482 Maintenance Support and Training — — — 133,271 133,271 Installation and Deployment — — — 69,196 69,196 Consulting and Network Design — — — 19,624 19,624 Total revenue by product line $ 1,377,519 $ 96,873 $ 30,482 $ 222,091 $ 1,726,965 Timing of revenue recognition: Products and services at a point in time $ 1,377,519 $ 30,092 $ 8,481 $ 8,874 $ 1,424,966 Services transferred over time — 66,781 22,001 213,217 301,999 Total revenue by timing of revenue recognition $ 1,377,519 $ 96,873 $ 30,482 $ 222,091 $ 1,726,965 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”). Americas includes activities in North America and South America. Within each geographic area, Ciena maintains 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. The following table reflects Ciena’s geographic distribution of revenue based principally 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 Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Geographic distribution: Americas $ 587,475 $ 650,381 $ 1,084,086 $ 1,224,385 EMEA 155,054 141,431 310,472 271,396 APAC 91,398 102,241 196,499 231,184 Total revenue by geographic distribution $ 833,927 $ 894,053 $ 1,591,057 $ 1,726,965 Ciena’s revenue includes $518.6 million and $598.4 million of United States revenue for the second quarter of fiscal 2021 and 2020, respectively. For the six months ended May 1, 2021 and May 2, 2020, United States revenue was $1.0 billion and $1.1 billion, respectively. No other country accounted for 10% or more of total revenue for the periods presented above. For the periods below, the only customers that accounted for at least 10% of Ciena’s revenue were as follows (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 AT&T $ 125,138 $ 105,630 $ 193,941 $ 189,640 Verizon n/a n/a n/a 203,630 Total $ 125,138 $ 105,630 $ 193,941 $ 393,270 n/a Denotes revenue representing less than 10% of total revenue for the period The customers identified above purchased products and services from each of Ciena’s operating segments. • Networking Platforms revenue reflects sales of Ciena’s Converged Packet Optical and Routing and Switching product lines . ◦ Converged Packet Optical - includes the 6500 Packet-Optical Platform, the Waveserver ® stackable interconnect system, the 6500 Reconfigurable Line System (RLS) and the 5400 family of Packet-Optical Platforms. This product line also includes sales of the Z-Series Packet-Optical Platform. ◦ Routing and Switching - 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, as well as planning tools and a number of legacy software solutions that support Ciena’s installed base of network solutions. 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, micro-services, standards-based open software suite, together with related services, that enables customers to implement large-scale software and IT-led operations support system (OSS) transformations by transforming legacy networks into “service ready” networks, accelerating the creation, delivery and lifecycle management of new, cloud-based services. Ciena’s Blue Planet Automation Platform includes multi-domain service orchestration (MDSO), inventory management (BPI), route optimization and analysis (ROA), network function virtualization orchestration (NFVO), and unified assurance and analytics (UAA). 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 either perpetual or term-based software licenses, and these sales are considered distinct performance obligations where revenue is generally recognized upfront at a point in time upon transfer of control. Revenue from software subscription and support is 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 is recognized over time with Ciena applying the input method to determine the amount of revenue to be recognized in a given period. • Global Services revenue 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 is 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 May 1, 2021 Balance at October 31, 2020 Accounts receivable, net $ 716,779 $ 719,405 Contract assets for unbilled accounts receivable, net $ 81,437 $ 85,843 Deferred revenue $ 204,299 $ 158,363 Ciena’s contract assets represent unbilled accounts receivable, net 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 below. Contract liabilities consist of deferred revenue and represent advanced payments against non-cancelable customer orders received prior to revenue recognition. Ciena recognized approximately $78.0 million and $76.5 million of revenue during the first six months of fiscal 2021 and 2020, respectively, that was included in the deferred revenue balance as of October 31, 2020 and November 2, 2019, respectively. Revenue recognized due to changes in transaction price from performance obligations satisfied or partially satisfied in previous periods was immaterial during the six months ended May 1, 2021 and May 2, 2020. Capitalized Contract Acquisition Costs Capitalized contract acquisition costs consist of deferred sales commissions, were $18.4 million and $15.3 million as of May 1, 2021 and October 31, 2020, respectively, and were included in prepaid expenses and other and other long-term assets. The amortization expense associated with these costs was $10.7 million and $10.1 million during the first six months of fiscal 2021 and 2020, 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 May 1, 2021, the

Canadian Emergency Wage Subsidy

Canadian Emergency Wage Subsidy	6 Months Ended
	May 01, 2021
Unusual or Infrequent Items, or Both [Abstract]
Canadian Emergency Wage Subsidy	CANADIAN EMERGENCY WAGE SUBSIDY In April 2020, the Canadian government introduced the Canada Emergency Wage Subsidy (“CEWS”) to help employers offset a portion of their employee wages for a limited period in response to the COVID-19 outbreak, retroactive to March 15, 2020. The CEWS program has been extended through June 2021, with a proposed extension through September 2021. The subsidy covers employers of all sizes and across all sectors. Ciena accounts for proceeds from government grants as a reduction of expense when there is reasonable assurance that Ciena has met the required conditions associated with the grant and that grant proceeds will be received. Grant benefits are recorded to the particular line item of the Condensed Consolidated Statement of Operations to which the grant activity relates. During the second quarter and six months ended May 1, 2021, Ciena recorded a CAD$51.1 million ($40.4 million) benefit, net of certain fees, related to CEWS for claim periods beginning March 15, 2020, including CAD$43.9 million ($34.7 million) related to employee wages during fiscal 2020. As of May 1, 2021, amounts receivable from this subsidy were CAD$4.8 million ($3.9 million). The following table summarizes CEWS for the periods indicated (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Product $ 4,189 $ — $ 4,189 $ — Service 2,620 — 2,620 — CEWS benefit in cost of goods sold 6,809 — 6,809 — Research and development 28,923 — 28,923 — Sales and marketing 2,551 — 2,551 — General and administrative 2,161 — 2,161 — CEWS benefit in operating expense 33,635 — 33,635 — Total CEWS benefit $ 40,444 $ — $ 40,444 $ —

Restructuring Costs

Restructuring Costs	6 Months Ended
	May 01, 2021
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 Ciena’s Condensed Consolidated Balance Sheets, for the six months ended May 1, 2021 (in thousands): Workforce Consolidation Total Balance at October 31, 2020 $ 2,915 $ — $ 2,915 Charges 2,617 (1) 11,459 (2) 14,076 Cash payments (4,696) (11,459) (16,155) Balance at May 1, 2021 $ 836 $ — $ 836 Current restructuring liabilities $ 836 $ — $ 836 (1) Reflects a global workforce reduction of 66 employees during the six months ended May 1, 2021 as part of a business optimization strategy to improve gross margin, constrain operating expense and redesign certain business processes. (2) Primarily represents the redesign of certain business processes and costs and imputed interest expense related to restructured facilities. 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 Ciena’s Condensed Consolidated Balance Sheets for the six months ended May 2, 2020 (in thousands): Workforce Consolidation Total Balance at November 2, 2019 $ 3,983 $ 11,160 $ 15,143 Charges 4,426 (1) 3,857 (2) 8,283 Adjustments related to ASC 842 — (11,160) (3) (11,160) Cash payments (5,982) (3,857) (9,839) Balance at May 2, 2020 $ 2,427 $ — $ 2,427 Current restructuring liabilities $ 2,427 $ — $ 2,427 (1) Reflects a global workforce reduction of approximately 86 employees during the six months ended May 2, 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 (“ROU”) assets, net in relation to adoption of ASC 842.

Interest and Other Income (Loss

Interest and Other Income (Loss), Net	6 Months Ended
	May 01, 2021
Other Income and Expenses [Abstract]
Interest and Other Income (Loss), Net	INTEREST AND OTHER INCOME (LOSS), NET The components of interest and other income (loss), net, are as follows (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Interest income $ 554 $ 2,023 $ 1,088 $ 5,413 Gains on non-hedge designated foreign currency forward contracts 5,180 1,086 9,709 1,723 Foreign currency exchange losses (6,575) (4,067) (13,493) (4,839) Other (433) (1,707) 301 (1,316) Interest and other income (loss), net $ (1,274) $ (2,665) $ (2,395) $ 981 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 $13.5 million and $4.8 million in foreign currency exchange rate losses during the first six months of fiscal 2021 and 2020, respectively, as a result of monetary assets and liabilities that were transacted in a currency other than Ciena’s functional currency. The related remeasurement adjustments were recorded in interest and other income (loss), 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 (loss), net, on the Condensed Consolidated Statements of Operations. During the first six months of fiscal 2021 and 2020, respectively, Ciena recorded gains of $9.7 million and $1.7 million from non-hedge designated foreign currency forward contracts.

Income Taxes

Income Taxes	6 Months Ended
	May 01, 2021
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The effective tax rate for the quarter and six months ended May 1, 2021 was lower than the effective tax rate for the second quarter and six months ended May 2, 2020, primarily due to an increased deduction for foreign-derived intangible income (“FDII”) as well as a decrease in the foreign effective tax rate. Ciena’s future income tax provisions and deferred tax balances may be affected by the amount of pre-tax income, the jurisdictions where it is earned, the existence and ability to utilize tax attributes and changes in tax laws and business reorganizations. Ciena continues to monitor these items and will adopt strategies to address their impact as appropriate.

Short-Term and Long-Term Invest

Short-Term and Long-Term Investments	6 Months Ended
	May 01, 2021
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): May 1, 2021 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations: Included in short-term investments $ 151,764 $ 52 $ — $ 151,816 Included in long-term investments 91,695 22 (2) 91,715 $ 243,459 $ 74 $ (2) $ 243,531 October 31, 2020 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations: Included in short-term investments $ 150,559 $ 109 $ (1) $ 150,667 Included in long-term investments 82,252 — (26) 82,226 $ 232,811 $ 109 $ (27) $ 232,893 The following table summarizes the final legal maturities of debt investments at May 1, 2021 (in thousands): Amortized Estimated Less than one year $ 151,764 $ 151,816 Due in 1-2 years 91,695 91,715 $ 243,459 $ 243,531

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	May 01, 2021
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): May 1, 2021 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 933,403 $ — $ — $ 933,403 Bond mutual fund 75,370 — — 75,370 Time deposits 30,018 — — 30,018 Deferred compensation plan assets 11,799 — — 11,799 U.S. government obligations — 243,531 — 243,531 Foreign currency forward contracts — 13,785 — 13,785 Total assets measured at fair value $ 1,050,590 $ 257,316 $ — $ 1,307,906 Liabilities: Foreign currency forward contracts $ — $ 285 $ — $ 285 Forward starting interest rate swaps — 22,794 — 22,794 Total liabilities measured at fair value $ — $ 23,079 $ — $ 23,079 October 31, 2020 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 889,293 $ — $ — $ 889,293 Bond mutual fund 50,361 — — 50,361 Deferred compensation plan assets 8,213 — — 8,213 U.S. government obligations — 232,893 — 232,893 Foreign currency forward contracts — 82 — 82 Total assets measured at fair value $ 947,867 $ 232,975 $ — $ 1,180,842 Liabilities: Foreign currency forward contracts $ — $ 681 $ — $ 681 Forward starting interest rate swaps — 28,513 — 28,513 Total liabilities measured at fair value $ — $ 29,194 $ — $ 29,194 As of the date indicated, the assets and liabilities above are presented on Ciena’s Condensed Consolidated Balance Sheets as follows (in thousands): May 1, 2021 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 1,038,791 $ — $ — $ 1,038,791 Short-term investments — 151,816 — 151,816 Prepaid expenses and other — 13,785 — 13,785 Long-term investments — 91,715 — 91,715 Other long-term assets 11,799 — — 11,799 Total assets measured at fair value $ 1,050,590 $ 257,316 $ — $ 1,307,906 Liabilities: Accrued liabilities and other short-term obligations $ — $ 285 $ — $ 285 Other long-term obligations — 22,794 — 22,794 Total liabilities measured at fair value $ — $ 23,079 $ — $ 23,079 October 31, 2020 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 939,654 $ — $ — $ 939,654 Short-term investments — 150,667 — 150,667 Prepaid expenses and other — 82 — 82 Other long-term assets 8,213 82,226 — 90,439 Total assets measured at fair value $ 947,867 $ 232,975 $ — $ 1,180,842 Liabilities: Accrued liabilities and other short-term obligations $ — $ 681 $ — $ 681 Other long-term obligations — 28,513 — 28,513 Total liabilities measured at fair value $ — $ 29,194 $ — $ 29,194 Ciena did not have any transfers between Level 1 and Level 2 fair value measurements during the periods presented.

Inventories

Inventories	6 Months Ended
	May 01, 2021
Inventory Disclosure [Abstract]
Inventories	INVENTORIES As of the dates indicated, inventories are comprised of the following (in thousands): May 1, October 31, Raw materials $ 139,430 $ 119,481 Work-in-process 10,809 13,738 Finished goods 234,220 210,050 Deferred cost of goods sold 57,390 40,747 Gross inventories 441,849 384,016 Provision for excess and obsolescence (40,616) (39,637) Inventories, net $ 401,233 $ 344,379 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 six months of fiscal 2021, Ciena recorded a provision for excess and obsolescence of $10.4 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	6 Months Ended
	May 01, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid Expenses and Other	PREPAID EXPENSES AND OTHERAs of the dates indicated, prepaid expenses and other are comprised of the following (in thousands): May 1, October 31, Contract assets for unbilled accounts receivable, net $ 81,437 $ 85,843 Prepaid expenses 77,389 70,647 Prepaid VAT and other taxes 72,325 72,838 Product demonstration equipment, net 45,151 44,793 Other non-trade receivables 14,193 21,981 Derivative assets 13,785 82 Capitalized contract acquisition costs 13,008 11,296 CEWS receivable 3,942 — Deferred deployment expense 421 604 $ 321,651 $ 308,084 Depreciation of product demonstration equipment was $5.1 million during the first six months of fiscal 2021 and $4.2 million during the first six months of fiscal 2020. For further discussion on contract assets and capitalized contract acquisition costs, see Note 3 above.

Other Balance Sheet Details

Other Balance Sheet Details	6 Months Ended
	May 01, 2021
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): May 1, October 31, Compensation, payroll related tax and benefits (1) $ 114,119 $ 135,462 Warranty 48,123 49,868 Vacation 30,612 26,945 Finance lease obligations 3,245 2,836 Interest payable 665 672 Other 133,296 118,349 $ 330,060 $ 334,132 (1) Reduction is primarily due to the timing of bonus payments to employees under Ciena’s annual cash incentive compensation plan. The following table summarizes the activity in Ciena’s accrued warranty for the periods indicated (in thousands): Beginning Balance Current Period Provisions Settlements Ending Balance Six Months Ended May 2, 2020 $ 48,498 13,793 (10,428) $ 51,863 Six Months Ended May 1, 2021 $ 49,868 7,937 (9,682) $ 48,123 As of the dates indicated, deferred revenue is comprised of the following (in thousands): May 1, October 31, Products $ 13,257 $ 17,534 Services 191,042 140,829 204,299 158,363 Less current portion (147,075) (108,700) Long-term deferred revenue $ 57,224 $ 49,663

Derivative Instruments

Derivative Instruments	6 Months Ended
	May 01, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	DERIVATIVE INSTRUMENTS Foreign Currency Derivatives Ciena conducts business globally in numerous currencies, and thus is exposed to adverse foreign currency exchange rate changes. To limit this exposure, Ciena enters into foreign currency contracts. Ciena does not enter into such contracts for speculative purposes. As of May 1, 2021 and October 31, 2020, Ciena had forward contracts to hedge its foreign exchange exposure in order to reduce variability principally related to research and development activities. The notional amount of these contracts was approximately $239.1 million and $254.9 million as of May 1, 2021 and October 31, 2020, respectively. These foreign exchange contracts have maturities of 24 months or less and have been designated as cash flow hedges. As of May 1, 2021 and October 31, 2020, 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 $244.8 million and $212.0 million as of May 1, 2021 and October 31, 2020, 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 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 May 1, 2021 and October 31, 2020. 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	6 Months Ended
	May 01, 2021
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 six months ended May 1, 2021 (in thousands): Unrealized Gain/(Loss) on Cumulative Available-for-sale Securities Foreign Currency Forward Contracts Forward Starting Interest Rate Swaps Foreign Currency Total Balance at October 31, 2020 $ 45 $ (219) $ (21,535) $ (13,649) $ (35,358) Other comprehensive gain (loss) before reclassifications (7) 14,690 (494) 26,261 40,450 Amounts reclassified from AOCI — (4,256) 4,525 — 269 Balance at May 1, 2021 $ 38 $ 10,215 $ (17,504) $ 12,612 $ 5,361 The following table summarizes the changes in AOCI, net of tax, for the six months ended May 2, 2020 (in thousands): Unrealized Gain/(Loss) on Cumulative Available-for-sale Securities Foreign Currency Forward Contracts Forward Starting Interest Rate Swaps Foreign Currency Total Balance at November 2, 2019 $ 152 $ 925 $ (13,686) $ (9,475) $ (22,084) Other comprehensive loss before reclassifications 310 (9,559) (10,932) (21,490) (41,671) Amounts reclassified from AOCI — 1,540 829 — 2,369 Balance at May 2, 2020 $ 462 $ (7,094) $ (23,789) $ (30,965) $ (61,386)

Leases

Leases	6 Months Ended
	May 01, 2021
Leases [Abstract]
Leases	LEASES Ciena leases over 1.3 million square feet of facilities globally. 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; Alpharetta, Georgia; Quebec, Canada; 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 11 years. Certain leases provide for options to extend up to ten years and/or options to terminate within five years. Leases included in the Condensed Consolidated Balance Sheets were as follows (in thousands): Classification As of May 1, 2021 As of October 31, 2020 Operating leases: Operating ROU assets Operating right-of-use assets $ 50,997 $ 57,026 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities 73,159 80,450 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 76,711 $ 70,791 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (21,771) (17,837) Buildings, net $ 54,940 $ 52,954 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 68,271 $ 64,401 ROU assets that involve subleased or vacant space aggregate to $4.6 million as of May 1, 2021. These assets may become impaired if tenants are unable to service their obligations under the sublease, and/or if the estimates as to occupancy are not realized, either of which may be more likely as COVID-19 impacts evolve. The components of lease expense included in the Condensed Consolidated Statement of Operations were as follows (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, Classification 2021 2020 2021 2020 Operating lease costs Operating expense $ 4,202 $ 4,744 $ 8,431 $ 9,201 Finance lease cost: Amortization of finance ROU asset Operating expense 1,191 1,093 2,356 2,233 Interest on finance lease liabilities Interest expense 1,207 1,168 2,428 2,412 Total finance lease cost 2,398 2,261 4,784 4,645 Non-capitalized lease cost Operating expense 333 707 626 1,328 Variable lease cost (1) Operating expense 1,452 1,324 3,051 2,635 Net lease cost (2) $ 8,385 $ 9,036 $ 16,892 $ 17,809 (1) Variable lease costs include 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 $2.6 million and $2.2 million for the second quarter of fiscal 2021 and 2020, respectively and $4.9 million and $6.5 million for the six months ended May 1, 2021 and May 2, 2020, respectively, related to amortization of leasehold improvements. Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of May 1, 2021 were as follows (in thousands): Operating Leases Finance Leases Total Remaining fiscal 2021 $ 10,772 $ 8,125 $ 18,897 2022 19,462 8,623 28,085 2023 16,020 8,624 24,644 2024 13,371 8,693 22,064 2025 9,058 8,832 17,890 Thereafter 9,434 58,544 67,978 Total lease payments 78,117 101,441 179,558 Less: Imputed interest (4,958) (33,170) (38,128) Present value of lease liabilities 73,159 68,271 141,430 Less: Current portion of present value of minimum lease payments (19,364) (3,245) (22,609) Long-term portion of present value of minimum lease payments $ 53,795 $ 65,026 $ 118,821 The weighted average remaining lease terms and weighted average discount rates for operating and finance leases were as follows: As of May 1, 2021 As of October 31, 2020 Weighted-average remaining lease term in years: Operating leases 4.53 4.87 Finance leases 11.22 11.71 Weighted-average discount rates: Operating leases 2.79 % 2.82 % Finance leases 7.56 % 7.56 %
Leases	LEASES Ciena leases over 1.3 million square feet of facilities globally. 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; Alpharetta, Georgia; Quebec, Canada; 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 11 years. Certain leases provide for options to extend up to ten years and/or options to terminate within five years. Leases included in the Condensed Consolidated Balance Sheets were as follows (in thousands): Classification As of May 1, 2021 As of October 31, 2020 Operating leases: Operating ROU assets Operating right-of-use assets $ 50,997 $ 57,026 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities 73,159 80,450 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 76,711 $ 70,791 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (21,771) (17,837) Buildings, net $ 54,940 $ 52,954 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 68,271 $ 64,401 ROU assets that involve subleased or vacant space aggregate to $4.6 million as of May 1, 2021. These assets may become impaired if tenants are unable to service their obligations under the sublease, and/or if the estimates as to occupancy are not realized, either of which may be more likely as COVID-19 impacts evolve. The components of lease expense included in the Condensed Consolidated Statement of Operations were as follows (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, Classification 2021 2020 2021 2020 Operating lease costs Operating expense $ 4,202 $ 4,744 $ 8,431 $ 9,201 Finance lease cost: Amortization of finance ROU asset Operating expense 1,191 1,093 2,356 2,233 Interest on finance lease liabilities Interest expense 1,207 1,168 2,428 2,412 Total finance lease cost 2,398 2,261 4,784 4,645 Non-capitalized lease cost Operating expense 333 707 626 1,328 Variable lease cost (1) Operating expense 1,452 1,324 3,051 2,635 Net lease cost (2) $ 8,385 $ 9,036 $ 16,892 $ 17,809 (1) Variable lease costs include 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 $2.6 million and $2.2 million for the second quarter of fiscal 2021 and 2020, respectively and $4.9 million and $6.5 million for the six months ended May 1, 2021 and May 2, 2020, respectively, related to amortization of leasehold improvements. Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of May 1, 2021 were as follows (in thousands): Operating Leases Finance Leases Total Remaining fiscal 2021 $ 10,772 $ 8,125 $ 18,897 2022 19,462 8,623 28,085 2023 16,020 8,624 24,644 2024 13,371 8,693 22,064 2025 9,058 8,832 17,890 Thereafter 9,434 58,544 67,978 Total lease payments 78,117 101,441 179,558 Less: Imputed interest (4,958) (33,170) (38,128) Present value of lease liabilities 73,159 68,271 141,430 Less: Current portion of present value of minimum lease payments (19,364) (3,245) (22,609) Long-term portion of present value of minimum lease payments $ 53,795 $ 65,026 $ 118,821 The weighted average remaining lease terms and weighted average discount rates for operating and finance leases were as follows: As of May 1, 2021 As of October 31, 2020 Weighted-average remaining lease term in years: Operating leases 4.53 4.87 Finance leases 11.22 11.71 Weighted-average discount rates: Operating leases 2.79 % 2.82 % Finance leases 7.56 % 7.56 %

Short-Term and Long-Term Debt

Short-Term and Long-Term Debt	6 Months Ended
	May 01, 2021
Debt Disclosure [Abstract]
Short-Term and Long-Term Debt	SHORT-TERM AND LONG-TERM DEBT 2025 Term Loan On January 23, 2020, Ciena entered into a Refinancing Amendment to Credit Agreement pursuant to which Ciena refinanced the entire outstanding amount of its then existing senior secured term loan and incurred a new senior secured term loan in an aggregate principal amount of $693.0 million and maturing on September 28, 2025 (the “2025 Term Loan”). The net carrying value of Ciena’s term loan was comprised of the following for the periods indicated (in thousands): May 1, 2021 October 31, 2020 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2025 Term Loan $ 684,337 $ (1,414) $ (2,638) $ 680,285 $ 683,286 Deferred debt issuance costs that were deducted from the carrying amounts of the term loan totaled $2.6 million as of May 1, 2021 and $2.9 million at October 31, 2020. 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 loan. The amortization of deferred debt issuance costs for this term loan is included in interest expense, and was $0.3 million during the first six months of each of fiscal 2021 and fiscal 2020. The carrying value of the term loan listed above is also net of any unamortized debt discounts. As of May 1, 2021, the estimated fair value of the 2025 Term Loan was $685.2 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	6 Months Ended
	May 01, 2021
Earnings Per Share [Abstract]
Earnings Per Share Calculation	EARNINGS PER SHARE CALCULATION The following table presents the calculation of basic and diluted net income per share (in thousands, except per share amounts): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Net income $ 103,117 $ 91,655 $ 158,465 $ 153,983 Basic weighted average shares outstanding 155,331 153,858 155,257 154,099 Effect of dilutive potential common shares 1,545 1,283 1,477 1,344 Diluted weighted average shares 156,876 155,141 156,734 155,443 Basic EPS $ 0.66 $ 0.60 $ 1.02 $ 1.00 Diluted EPS $ 0.66 $ 0.59 $ 1.01 $ 0.99 Antidilutive employee share-based awards, excluded 30 203 82 467 Basic net income per common share (“Basic EPS”) is computed using the weighted average number of common shares outstanding. Diluted net income per potential common share (“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.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	May 01, 2021
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. After temporarily suspending repurchases of Ciena’s common stock during fiscal 2020, Ciena reinstituted its stock repurchase program in the first quarter of 2021 . 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, 2020 5,710,912 $ 39.33 $ 224,611 Repurchase of common stock under the stock repurchase program 735,075 53.60 39,398 Cumulative balance at May 1, 2021 6,445,987 $ 40.96 $ 264,009 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 $27.9 million for the shares of Ciena’s stock repurchased during the first six months of fiscal 2021 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	6 Months Ended
	May 01, 2021
Share-based Payment Arrangement [Abstract]
Share-Based Compensation Expense	SHARE-BASED COMPENSATION EXPENSEAmended and Restated ESPP Ciena makes shares of its common stock available for purchase under its Amended and Restated Ciena Corporation Employee Stock Purchase Plan (the “ESPP”). Under the ESPP, eligible employees may enroll in a twelve-month offer period that begins in December and June of each year. Each offer period includes two six-month purchase periods. Employees may purchase a limited number of shares of Ciena common stock at 85% of the fair market value on either the day immediately preceding the offer date or the purchase date, whichever is lower. The ESPP is considered compensatory for purposes of share-based compensation expense. On January 29, 2021, Ciena’s Board of Directors adopted an amendment and restatement of the ESPP to increase the number of shares available for issuance thereunder by 8.7 million and eliminate the evergreen mechanism thereunder, which became effective upon its approval by Ciena’s stockholders on April 1, 2021. Unless earlier terminated, the ESPP will terminate on April 1, 2031. The following table summarizes share-based compensation expense for the periods indicated (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Product $ 498 $ 827 $ 1,451 $ 1,498 Service 1,421 1,036 2,626 1,878 Share-based compensation expense included in cost of goods sold 1,919 1,863 4,077 3,376 Research and development 5,844 4,822 10,638 8,671 Sales and marketing 6,610 5,264 12,426 9,877 General and administrative 6,743 5,975 13,101 11,502 Share-based compensation expense included in operating expense 19,197 16,061 36,165 30,050 Share-based compensation expense capitalized in inventory, net 419 53 257 153 Total share-based compensation $ 21,535 $ 17,977 $ 40,499 $ 33,579 As of May 1, 2021, total unrecognized share-based compensation expense was approximately $155.6 million, which relates to unvested stock unit awards and is expected to be recognized over a weighted-average period of 1.57 years.

Segments and Entity-Wide Disclo

Segments and Entity-Wide Disclosures	6 Months Ended
	May 01, 2021
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. Ciena's long-lived assets, including equipment, building, furniture and fixtures, ROU assets, 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 May 1, 2021, equipment, building, furniture and fixtures, net, totaled $298.3 million, and operating ROU assets totaled $51.0 million both of which support asset groups within Ciena’s four operating segments and unallocated selling and general and administrative activities. As of May 1, 2021, finite-lived intangible assets, goodwill and maintenance spares are assigned to asset groups within the following segments (in thousands): Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Other intangible assets, net $ 11,395 $ — $ 71,484 $ — $ 82,879 Goodwill $ 66,493 $ 156,191 $ 89,050 $ — $ 311,734 Maintenance spares, net $ — $ — $ — $ 63,003 $ 63,003 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 (loss), 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 for the periods indicated (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Segment profit (loss): Networking Platforms $ 211,412 $ 210,987 $ 367,843 $ 379,256 Platform Software and Services 36,506 21,668 64,166 50,619 Blue Planet Automation Software and Services 5,688 (4,399) 3,254 (7,512) Global Services 48,567 53,540 92,060 99,068 Total segment profit 302,173 281,796 527,323 521,431 Less: Non-performance operating expenses Selling and marketing 110,387 101,214 207,665 208,280 General and administrative 43,635 42,030 83,628 84,498 Amortization of intangible assets 6,019 5,839 11,929 11,692 Significant asset impairments and restructuring costs 8,209 3,811 14,076 8,283 Acquisition and integration costs 294 1,414 601 3,233 Add: Other non-performance financial items Interest expense and other income (loss), net (9,059) (10,525) (17,540) (15,694) Loss on extinguishment and modification of debt — — — (646) Less: Provision for income taxes 21,453 25,308 33,419 35,122 Consolidated net income $ 103,117 $ 91,655 $ 158,465 $ 153,983 Entity-Wide Reporting The following table reflects Ciena’s geographic distribution of equipment, building, furniture and fixtures, net, and operating ROU assets, with any country accounting for at least 10% of total equipment, building, furniture and fixtures, net, and operating ROU assets specifically identified. Equipment, building, furniture and fixtures, net, and operating ROU assets 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, and operating ROU assets was as follows (in thousands): May 1, October 31, Canada $ 247,309 $ 214,188 United States 59,229 65,321 Other International 42,788 49,894 Total $ 349,326 $ 329,403

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	May 01, 2021
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 $46.9 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 May 1, 2021, Ciena has recorded CAD$45.5 million (approximately $37.0 million) in cumulative benefits as a reduction in research and development expense of which CAD$4.9 million ($3.8 million) was recorded in the first six months of fiscal 2021. As of May 1, 2021, amounts receivable from this grant were CAD$2.7 million ($2.2 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	6 Months Ended
	May 01, 2021
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Stock Repurchase Program From the end of the second quarter of fiscal 2021 through June 4, 2021, Ciena repurchased an additional 195,920 shares of its common stock, for an aggregate purchase price of $10.4 million at an average price of $52.84 per share, inclusive of repurchases pending settlement. As of June 4, 2021, Ciena has repurchased an aggregate of 6,641,907 shares and has an aggregate of $225.6 million of authorized funds remaining under its stock repurchase program.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	6 Months Ended
	May 01, 2021
Accounting Policies [Abstract]
Newly Issued Accounting Standards - Effective and Not Yet Effective	Newly Issued Accounting Standards - Effective In June 2016, the Financial Accounting Standards Board (”FASB”) issued Accounting Standards Update 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. Ciena adopted ASU 2016-13 on a modified retrospective basis in the first quarter of fiscal year 2021 through a cumulative-effect adjustment at the beginning of the period of adoption and did not restate prior periods. The standard primarily impacts the value of Ciena’s accounts receivable, net and contract assets, net. Adoption of ASU 2016-13 did not have a material effect on Ciena’s financial position or results of operations. Ciena’s significant accounting policies updated as a result of adopting this standard are as follows: Allowance for Credit Losses for Accounts Receivable and Contract Assets Ciena estimates its allowances for credit losses using relevant available information from internal and external sources, related to past events, current conditions and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. When assessing for credit losses, Ciena determines collectability by pooling assets with similar characteristics. The allowances for credit losses are each measured on a collective basis when similar risk characteristics exist. The allowances for credit losses are each measured by multiplying the exposure probability of default, the probability the asset will default within a given time frame, by the loss given default rate, the percentage of the asset not expected to be collected due to default, based on the pool of assets. Probability of default rates are published by third-party credit rating agencies. Adjustments to Ciena’s exposure probability may take into account including, but not limited to, various customer-specific factors, the potential sovereign risk of the geographic locations in which the customer is operating and macroeconomic conditions. These factors are updated regularly or when facts and circumstances indicate that an update is deemed necessary. Newly Issued Accounting Standards - Not Yet Effective In March 2020, the FASB issued ASU No. 2020-04 ( “ASU 2020-04” ), Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting . ASU 2020-04 provides temporary optional guidance on contract modifications and hedging accounting to ease the financial reporting burdens of the expected market transition from the London Interbank Offered Rate (“LIBOR”) to alternative reference rates. In January 2021, the FASB issued ASU 2021-01, which refines the scope of Topic 848 and clarifies some of its guidance as part of the FASB’s monitoring of global reference rate activities. The new guidance was effective upon issuance, and Ciena is allowed to elect to apply the amendments prospectively through December 31, 2022. Ciena is currently evaluating the impact of this accounting standard update on its consolidated financial statements and related disclosures. In December 2019, the FASB issued ASU No. 2019-12 ( “ASU 2019-12”), Income Taxes (ASC 740): Simplifying the Accounting for Income Taxes

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	May 01, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The tables below set forth Ciena’s disaggregated revenue for the respective periods (in thousands): Quarter Ended May 1, 2021 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 573,657 $ — $ — $ — $ 573,657 Routing and Switching 63,628 — — — 63,628 Platform Software and Services — 56,688 — — 56,688 Blue Planet Automation Software and Services — — 23,958 — 23,958 Maintenance Support and Training — — — 70,418 70,418 Installation and Deployment — — — 37,999 37,999 Consulting and Network Design — — — 7,579 7,579 Total revenue by product line $ 637,285 $ 56,688 $ 23,958 $ 115,996 $ 833,927 Timing of revenue recognition: Products and services at a point in time $ 637,285 $ 20,765 $ 10,765 $ 1,411 $ 670,226 Services transferred over time — 35,923 13,193 114,585 163,701 Total revenue by timing of revenue recognition $ 637,285 $ 56,688 $ 23,958 $ 115,996 $ 833,927 Quarter Ended May 2, 2020 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 654,294 $ — $ — $ — $ 654,294 Routing and Switching 64,167 — — — 64,167 Platform Software and Services — 44,985 — — 44,985 Blue Planet Automation Software and Services — — 15,017 — 15,017 Maintenance Support and Training — — — 71,479 71,479 Installation and Deployment — — — 34,242 34,242 Consulting and Network Design — — — 9,869 9,869 Total revenue by product line $ 718,461 $ 44,985 $ 15,017 $ 115,590 $ 894,053 Timing of revenue recognition: Products and services at a point in time $ 718,461 $ 16,978 $ 4,745 $ 4,677 $ 744,861 Services transferred over time — 28,007 10,272 110,913 149,192 Total revenue by timing of revenue recognition $ 718,461 $ 44,985 $ 15,017 $ 115,590 $ 894,053 Six Months Ended May 1, 2021 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 1,085,981 $ — $ — $ — $ 1,085,981 Routing and Switching 127,934 — — — 127,934 Platform Software and Services — 106,527 — — 106,527 Blue Planet Automation Software and Services — — 40,892 — 40,892 Maintenance Support and Training — — — 138,049 138,049 Installation and Deployment — — — 77,610 77,610 Consulting and Network Design — — — 14,064 14,064 Total revenue by product line $ 1,213,915 $ 106,527 $ 40,892 $ 229,723 $ 1,591,057 Timing of revenue recognition: Products and services at a point in time $ 1,213,915 $ 36,828 $ 15,939 $ 3,268 $ 1,269,950 Services transferred over time — 69,699 24,953 226,455 321,107 Total revenue by timing of revenue recognition $ 1,213,915 $ 106,527 $ 40,892 $ 229,723 $ 1,591,057 Six Months Ended May 2, 2020 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 1,245,844 $ — $ — $ — $ 1,245,844 Routing Switching 131,675 — — — 131,675 Platform Software and Services — 96,873 — — 96,873 Blue Planet Automation Software and Services — — 30,482 — 30,482 Maintenance Support and Training — — — 133,271 133,271 Installation and Deployment — — — 69,196 69,196 Consulting and Network Design — — — 19,624 19,624 Total revenue by product line $ 1,377,519 $ 96,873 $ 30,482 $ 222,091 $ 1,726,965 Timing of revenue recognition: Products and services at a point in time $ 1,377,519 $ 30,092 $ 8,481 $ 8,874 $ 1,424,966 Services transferred over time — 66,781 22,001 213,217 301,999 Total revenue by timing of revenue recognition $ 1,377,519 $ 96,873 $ 30,482 $ 222,091 $ 1,726,965 Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Geographic distribution: Americas $ 587,475 $ 650,381 $ 1,084,086 $ 1,224,385 EMEA 155,054 141,431 310,472 271,396 APAC 91,398 102,241 196,499 231,184 Total revenue by geographic distribution $ 833,927 $ 894,053 $ 1,591,057 $ 1,726,965 For the periods below, the only customers that accounted for at least 10% of Ciena’s revenue were as follows (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 AT&T $ 125,138 $ 105,630 $ 193,941 $ 189,640 Verizon n/a n/a n/a 203,630 Total $ 125,138 $ 105,630 $ 193,941 $ 393,270 n/a Denotes revenue representing less than 10% of total revenue for the period
Contract Balances	The following table provides information about receivables, contract assets and contract liabilities (deferred revenue) from contracts with customers (in thousands): Balance at May 1, 2021 Balance at October 31, 2020 Accounts receivable, net $ 716,779 $ 719,405 Contract assets for unbilled accounts receivable, net $ 81,437 $ 85,843 Deferred revenue $ 204,299 $ 158,363 As of the dates indicated, deferred revenue is comprised of the following (in thousands): May 1, October 31, Products $ 13,257 $ 17,534 Services 191,042 140,829 204,299 158,363 Less current portion (147,075) (108,700) Long-term deferred revenue $ 57,224 $ 49,663

Canadian Emergency Wage Subsi_2

Canadian Emergency Wage Subsidy (Tables)	6 Months Ended
	May 01, 2021
Unusual or Infrequent Items, or Both [Abstract]
Schedule of Canadian Emergency Wage Subsidy	The following table summarizes CEWS for the periods indicated (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Product $ 4,189 $ — $ 4,189 $ — Service 2,620 — 2,620 — CEWS benefit in cost of goods sold 6,809 — 6,809 — Research and development 28,923 — 28,923 — Sales and marketing 2,551 — 2,551 — General and administrative 2,161 — 2,161 — CEWS benefit in operating expense 33,635 — 33,635 — Total CEWS benefit $ 40,444 $ — $ 40,444 $ —

Restructuring Costs (Tables)

Restructuring Costs (Tables)	6 Months Ended
	May 01, 2021
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 Ciena’s Condensed Consolidated Balance Sheets, for the six months ended May 1, 2021 (in thousands): Workforce Consolidation Total Balance at October 31, 2020 $ 2,915 $ — $ 2,915 Charges 2,617 (1) 11,459 (2) 14,076 Cash payments (4,696) (11,459) (16,155) Balance at May 1, 2021 $ 836 $ — $ 836 Current restructuring liabilities $ 836 $ — $ 836 (1) Reflects a global workforce reduction of 66 employees during the six months ended May 1, 2021 as part of a business optimization strategy to improve gross margin, constrain operating expense and redesign certain business processes. (2) Primarily represents the redesign of certain business processes and costs and imputed interest expense related to restructured facilities. 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 Ciena’s Condensed Consolidated Balance Sheets for the six months ended May 2, 2020 (in thousands): Workforce Consolidation Total Balance at November 2, 2019 $ 3,983 $ 11,160 $ 15,143 Charges 4,426 (1) 3,857 (2) 8,283 Adjustments related to ASC 842 — (11,160) (3) (11,160) Cash payments (5,982) (3,857) (9,839) Balance at May 2, 2020 $ 2,427 $ — $ 2,427 Current restructuring liabilities $ 2,427 $ — $ 2,427 (1) Reflects a global workforce reduction of approximately 86 employees during the six months ended May 2, 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 (“ROU”) assets, net in relation to adoption of ASC 842.

Interest and Other Income (Lo_2

Interest and Other Income (Loss), Net (Tables)	6 Months Ended
	May 01, 2021
Other Income and Expenses [Abstract]
Interest and Other Income (Loss), Net	The components of interest and other income (loss), net, are as follows (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Interest income $ 554 $ 2,023 $ 1,088 $ 5,413 Gains on non-hedge designated foreign currency forward contracts 5,180 1,086 9,709 1,723 Foreign currency exchange losses (6,575) (4,067) (13,493) (4,839) Other (433) (1,707) 301 (1,316) Interest and other income (loss), net $ (1,274) $ (2,665) $ (2,395) $ 981

Short-Term and Long-Term Inve_2

Short-Term and Long-Term Investments (Tables)	6 Months Ended
	May 01, 2021
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): May 1, 2021 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations: Included in short-term investments $ 151,764 $ 52 $ — $ 151,816 Included in long-term investments 91,695 22 (2) 91,715 $ 243,459 $ 74 $ (2) $ 243,531 October 31, 2020 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations: Included in short-term investments $ 150,559 $ 109 $ (1) $ 150,667 Included in long-term investments 82,252 — (26) 82,226 $ 232,811 $ 109 $ (27) $ 232,893
Schedule of Legal Maturities of Debt Investments	The following table summarizes the final legal maturities of debt investments at May 1, 2021 (in thousands): Amortized Estimated Less than one year $ 151,764 $ 151,816 Due in 1-2 years 91,695 91,715 $ 243,459 $ 243,531

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	May 01, 2021
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): May 1, 2021 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 933,403 $ — $ — $ 933,403 Bond mutual fund 75,370 — — 75,370 Time deposits 30,018 — — 30,018 Deferred compensation plan assets 11,799 — — 11,799 U.S. government obligations — 243,531 — 243,531 Foreign currency forward contracts — 13,785 — 13,785 Total assets measured at fair value $ 1,050,590 $ 257,316 $ — $ 1,307,906 Liabilities: Foreign currency forward contracts $ — $ 285 $ — $ 285 Forward starting interest rate swaps — 22,794 — 22,794 Total liabilities measured at fair value $ — $ 23,079 $ — $ 23,079 October 31, 2020 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 889,293 $ — $ — $ 889,293 Bond mutual fund 50,361 — — 50,361 Deferred compensation plan assets 8,213 — — 8,213 U.S. government obligations — 232,893 — 232,893 Foreign currency forward contracts — 82 — 82 Total assets measured at fair value $ 947,867 $ 232,975 $ — $ 1,180,842 Liabilities: Foreign currency forward contracts $ — $ 681 $ — $ 681 Forward starting interest rate swaps — 28,513 — 28,513 Total liabilities measured at fair value $ — $ 29,194 $ — $ 29,194
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): May 1, 2021 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 1,038,791 $ — $ — $ 1,038,791 Short-term investments — 151,816 — 151,816 Prepaid expenses and other — 13,785 — 13,785 Long-term investments — 91,715 — 91,715 Other long-term assets 11,799 — — 11,799 Total assets measured at fair value $ 1,050,590 $ 257,316 $ — $ 1,307,906 Liabilities: Accrued liabilities and other short-term obligations $ — $ 285 $ — $ 285 Other long-term obligations — 22,794 — 22,794 Total liabilities measured at fair value $ — $ 23,079 $ — $ 23,079 October 31, 2020 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 939,654 $ — $ — $ 939,654 Short-term investments — 150,667 — 150,667 Prepaid expenses and other — 82 — 82 Other long-term assets 8,213 82,226 — 90,439 Total assets measured at fair value $ 947,867 $ 232,975 $ — $ 1,180,842 Liabilities: Accrued liabilities and other short-term obligations $ — $ 681 $ — $ 681 Other long-term obligations — 28,513 — 28,513 Total liabilities measured at fair value $ — $ 29,194 $ — $ 29,194

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	May 01, 2021
Inventory Disclosure [Abstract]
Schedule of Inventories	As of the dates indicated, inventories are comprised of the following (in thousands): May 1, October 31, Raw materials $ 139,430 $ 119,481 Work-in-process 10,809 13,738 Finished goods 234,220 210,050 Deferred cost of goods sold 57,390 40,747 Gross inventories 441,849 384,016 Provision for excess and obsolescence (40,616) (39,637) Inventories, net $ 401,233 $ 344,379

Prepaid Expenses and Other (Tab

Prepaid Expenses and Other (Tables)	6 Months Ended
	May 01, 2021
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): May 1, October 31, Contract assets for unbilled accounts receivable, net $ 81,437 $ 85,843 Prepaid expenses 77,389 70,647 Prepaid VAT and other taxes 72,325 72,838 Product demonstration equipment, net 45,151 44,793 Other non-trade receivables 14,193 21,981 Derivative assets 13,785 82 Capitalized contract acquisition costs 13,008 11,296 CEWS receivable 3,942 — Deferred deployment expense 421 604 $ 321,651 $ 308,084

Other Balance Sheet Details (Ta

Other Balance Sheet Details (Tables)	6 Months Ended
	May 01, 2021
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): May 1, October 31, Compensation, payroll related tax and benefits (1) $ 114,119 $ 135,462 Warranty 48,123 49,868 Vacation 30,612 26,945 Finance lease obligations 3,245 2,836 Interest payable 665 672 Other 133,296 118,349 $ 330,060 $ 334,132 (1) Reduction is primarily due to the timing of bonus payments to employees under Ciena’s annual cash incentive compensation plan.
Schedule of Accrued Warranties	The following table summarizes the activity in Ciena’s accrued warranty for the periods indicated (in thousands): Beginning Balance Current Period Provisions Settlements Ending Balance Six Months Ended May 2, 2020 $ 48,498 13,793 (10,428) $ 51,863 Six Months Ended May 1, 2021 $ 49,868 7,937 (9,682) $ 48,123
Contract Balances	The following table provides information about receivables, contract assets and contract liabilities (deferred revenue) from contracts with customers (in thousands): Balance at May 1, 2021 Balance at October 31, 2020 Accounts receivable, net $ 716,779 $ 719,405 Contract assets for unbilled accounts receivable, net $ 81,437 $ 85,843 Deferred revenue $ 204,299 $ 158,363 As of the dates indicated, deferred revenue is comprised of the following (in thousands): May 1, October 31, Products $ 13,257 $ 17,534 Services 191,042 140,829 204,299 158,363 Less current portion (147,075) (108,700) Long-term deferred revenue $ 57,224 $ 49,663

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	May 01, 2021
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 six months ended May 1, 2021 (in thousands): Unrealized Gain/(Loss) on Cumulative Available-for-sale Securities Foreign Currency Forward Contracts Forward Starting Interest Rate Swaps Foreign Currency Total Balance at October 31, 2020 $ 45 $ (219) $ (21,535) $ (13,649) $ (35,358) Other comprehensive gain (loss) before reclassifications (7) 14,690 (494) 26,261 40,450 Amounts reclassified from AOCI — (4,256) 4,525 — 269 Balance at May 1, 2021 $ 38 $ 10,215 $ (17,504) $ 12,612 $ 5,361 The following table summarizes the changes in AOCI, net of tax, for the six months ended May 2, 2020 (in thousands): Unrealized Gain/(Loss) on Cumulative Available-for-sale Securities Foreign Currency Forward Contracts Forward Starting Interest Rate Swaps Foreign Currency Total Balance at November 2, 2019 $ 152 $ 925 $ (13,686) $ (9,475) $ (22,084) Other comprehensive loss before reclassifications 310 (9,559) (10,932) (21,490) (41,671) Amounts reclassified from AOCI — 1,540 829 — 2,369 Balance at May 2, 2020 $ 462 $ (7,094) $ (23,789) $ (30,965) $ (61,386)

Leases (Tables)

Leases (Tables)	6 Months Ended
	May 01, 2021
Leases [Abstract]
Leases Included in the Balance Sheet	Leases included in the Condensed Consolidated Balance Sheets were as follows (in thousands): Classification As of May 1, 2021 As of October 31, 2020 Operating leases: Operating ROU assets Operating right-of-use assets $ 50,997 $ 57,026 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities 73,159 80,450 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 76,711 $ 70,791 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (21,771) (17,837) Buildings, net $ 54,940 $ 52,954 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 68,271 $ 64,401 The weighted average remaining lease terms and weighted average discount rates for operating and finance leases were as follows: As of May 1, 2021 As of October 31, 2020 Weighted-average remaining lease term in years: Operating leases 4.53 4.87 Finance leases 11.22 11.71 Weighted-average discount rates: Operating leases 2.79 % 2.82 % Finance leases 7.56 % 7.56 %
Components of Lease Expense	The components of lease expense included in the Condensed Consolidated Statement of Operations were as follows (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, Classification 2021 2020 2021 2020 Operating lease costs Operating expense $ 4,202 $ 4,744 $ 8,431 $ 9,201 Finance lease cost: Amortization of finance ROU asset Operating expense 1,191 1,093 2,356 2,233 Interest on finance lease liabilities Interest expense 1,207 1,168 2,428 2,412 Total finance lease cost 2,398 2,261 4,784 4,645 Non-capitalized lease cost Operating expense 333 707 626 1,328 Variable lease cost (1) Operating expense 1,452 1,324 3,051 2,635 Net lease cost (2) $ 8,385 $ 9,036 $ 16,892 $ 17,809 (1) Variable lease costs include 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 $2.6 million and $2.2 million for the second quarter of fiscal 2021 and 2020, respectively and $4.9 million and $6.5 million for the six months ended May 1, 2021 and May 2, 2020, respectively, 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 May 1, 2021 were as follows (in thousands): Operating Leases Finance Leases Total Remaining fiscal 2021 $ 10,772 $ 8,125 $ 18,897 2022 19,462 8,623 28,085 2023 16,020 8,624 24,644 2024 13,371 8,693 22,064 2025 9,058 8,832 17,890 Thereafter 9,434 58,544 67,978 Total lease payments 78,117 101,441 179,558 Less: Imputed interest (4,958) (33,170) (38,128) Present value of lease liabilities 73,159 68,271 141,430 Less: Current portion of present value of minimum lease payments (19,364) (3,245) (22,609) Long-term portion of present value of minimum lease payments $ 53,795 $ 65,026 $ 118,821
Finance Lease, Liability, Maturity	Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of May 1, 2021 were as follows (in thousands): Operating Leases Finance Leases Total Remaining fiscal 2021 $ 10,772 $ 8,125 $ 18,897 2022 19,462 8,623 28,085 2023 16,020 8,624 24,644 2024 13,371 8,693 22,064 2025 9,058 8,832 17,890 Thereafter 9,434 58,544 67,978 Total lease payments 78,117 101,441 179,558 Less: Imputed interest (4,958) (33,170) (38,128) Present value of lease liabilities 73,159 68,271 141,430 Less: Current portion of present value of minimum lease payments (19,364) (3,245) (22,609) Long-term portion of present value of minimum lease payments $ 53,795 $ 65,026 $ 118,821

Short-Term and Long-Term Debt (

Short-Term and Long-Term Debt (Tables)	6 Months Ended
	May 01, 2021
Debt Disclosure [Abstract]
Schedule of Carrying Values and Estimated Fair Values of Convertible Notes	The net carrying value of Ciena’s term loan was comprised of the following for the periods indicated (in thousands): May 1, 2021 October 31, 2020 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2025 Term Loan $ 684,337 $ (1,414) $ (2,638) $ 680,285 $ 683,286

Earnings Per Share Calculation

Earnings Per Share Calculation (Tables)	6 Months Ended
	May 01, 2021
Earnings Per Share [Abstract]
Schedule of Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share	The following table presents the calculation of basic and diluted net income per share (in thousands, except per share amounts): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Net income $ 103,117 $ 91,655 $ 158,465 $ 153,983 Basic weighted average shares outstanding 155,331 153,858 155,257 154,099 Effect of dilutive potential common shares 1,545 1,283 1,477 1,344 Diluted weighted average shares 156,876 155,141 156,734 155,443 Basic EPS $ 0.66 $ 0.60 $ 1.02 $ 1.00 Diluted EPS $ 0.66 $ 0.59 $ 1.01 $ 0.99 Antidilutive employee share-based awards, excluded 30 203 82 467

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	May 01, 2021
Equity [Abstract]
Schedule of Stock Repurchase Program	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, 2020 5,710,912 $ 39.33 $ 224,611 Repurchase of common stock under the stock repurchase program 735,075 53.60 39,398 Cumulative balance at May 1, 2021 6,445,987 $ 40.96 $ 264,009

Share-Based Compensation Expe_2

Share-Based Compensation Expense (Tables)	6 Months Ended
	May 01, 2021
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 Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Product $ 498 $ 827 $ 1,451 $ 1,498 Service 1,421 1,036 2,626 1,878 Share-based compensation expense included in cost of goods sold 1,919 1,863 4,077 3,376 Research and development 5,844 4,822 10,638 8,671 Sales and marketing 6,610 5,264 12,426 9,877 General and administrative 6,743 5,975 13,101 11,502 Share-based compensation expense included in operating expense 19,197 16,061 36,165 30,050 Share-based compensation expense capitalized in inventory, net 419 53 257 153 Total share-based compensation $ 21,535 $ 17,977 $ 40,499 $ 33,579

Segments and Entity-Wide Disc_2

Segments and Entity-Wide Disclosures (Tables)	6 Months Ended
	May 01, 2021
Segment Reporting [Abstract]
Reconciliation of Assets from Segment to Consolidated	As of May 1, 2021, finite-lived intangible assets, goodwill and maintenance spares are assigned to asset groups within the following segments (in thousands): Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Other intangible assets, net $ 11,395 $ — $ 71,484 $ — $ 82,879 Goodwill $ 66,493 $ 156,191 $ 89,050 $ — $ 311,734 Maintenance spares, net $ — $ — $ — $ 63,003 $ 63,003
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 for the periods indicated (in thousands): Quarter Ended Six Months Ended May 1, May 2, May 1, May 2, 2021 2020 2021 2020 Segment profit (loss): Networking Platforms $ 211,412 $ 210,987 $ 367,843 $ 379,256 Platform Software and Services 36,506 21,668 64,166 50,619 Blue Planet Automation Software and Services 5,688 (4,399) 3,254 (7,512) Global Services 48,567 53,540 92,060 99,068 Total segment profit 302,173 281,796 527,323 521,431 Less: Non-performance operating expenses Selling and marketing 110,387 101,214 207,665 208,280 General and administrative 43,635 42,030 83,628 84,498 Amortization of intangible assets 6,019 5,839 11,929 11,692 Significant asset impairments and restructuring costs 8,209 3,811 14,076 8,283 Acquisition and integration costs 294 1,414 601 3,233 Add: Other non-performance financial items Interest expense and other income (loss), net (9,059) (10,525) (17,540) (15,694) Loss on extinguishment and modification of debt — — — (646) Less: Provision for income taxes 21,453 25,308 33,419 35,122 Consolidated net income $ 103,117 $ 91,655 $ 158,465 $ 153,983
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, and operating ROU assets was as follows (in thousands): May 1, October 31, Canada $ 247,309 $ 214,188 United States 59,229 65,321 Other International 42,788 49,894 Total $ 349,326 $ 329,403

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 833,927	$ 894,053	$ 1,591,057	$ 1,726,965
Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	670,226	744,861	1,269,950	1,424,966
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	163,701	149,192	321,107	301,999
Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	573,657	654,294	1,085,981	1,245,844
Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	63,628	64,167	127,934	131,675
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	56,688	44,985	106,527	96,873
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	23,958	15,017	40,892	30,482
Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	70,418	71,479	138,049	133,271
Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	37,999	34,242	77,610	69,196
Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	7,579	9,869	14,064	19,624
Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	637,285	718,461	1,213,915	1,377,519
Networking Platforms | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	637,285	718,461	1,213,915	1,377,519
Networking Platforms | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	637,285	718,461	1,213,915	1,377,519
Networking Platforms | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	573,657	654,294	1,085,981	1,245,844
Networking Platforms | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	63,628	64,167	127,934	131,675
Networking Platforms | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	56,688	44,985	106,527	96,873
Platform Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	20,765	16,978	36,828	30,092
Platform Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	35,923	28,007	69,699	66,781
Platform Software and Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	56,688	44,985	106,527	96,873
Platform Software and Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	56,688	44,985	106,527	96,873
Platform Software and Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	23,958	15,017	40,892	30,482
Blue Planet Automation Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	10,765	4,745	15,939	8,481
Blue Planet Automation Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	13,193	10,272	24,953	22,001
Blue Planet Automation Software and Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	23,958	15,017	40,892	30,482
Blue Planet Automation Software and Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	23,958	15,017	40,892	30,482
Blue Planet Automation Software and Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services
Disaggregation of Revenue [Line Items]
Total revenue	115,996	115,590	229,723	222,091
Global Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	1,411	4,677	3,268	8,874
Global Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	114,585	110,913	226,455	213,217
Global Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	115,996	115,590	229,723	222,091
Global Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	70,418	71,479	138,049	133,271
Global Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	37,999	34,242	77,610	69,196
Global Services | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	$ 7,579	$ 9,869	$ 14,064	$ 19,624

Revenue - Geographical Distribu

Revenue - Geographical Distribution of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 833,927	$ 894,053	$ 1,591,057	$ 1,726,965
Americas
Disaggregation of Revenue [Line Items]
Total revenue	587,475	650,381	1,084,086	1,224,385
EMEA
Disaggregation of Revenue [Line Items]
Total revenue	155,054	141,431	310,472	271,396
APAC
Disaggregation of Revenue [Line Items]
Total revenue	91,398	102,241	196,499	231,184
United States
Disaggregation of Revenue [Line Items]
Total revenue	$ 518,600	$ 598,400	$ 1,000,000	$ 1,100,000

Revenue - Revenue by Major Cust

Revenue - Revenue by Major Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020
Revenue, Major Customer [Line Items]
Total revenue	$ 833,927	$ 894,053	$ 1,591,057	$ 1,726,965
AT&T | Customer concentration risk
Revenue, Major Customer [Line Items]
Total revenue	125,138	105,630	193,941	189,640
Verizon | Customer concentration risk
Revenue, Major Customer [Line Items]
Total revenue				203,630
Total | Customer concentration risk
Revenue, Major Customer [Line Items]
Total revenue	$ 125,138	$ 105,630	$ 193,941	$ 393,270

Revenue - Contract Balances (De

Revenue - Contract Balances (Details) - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 716,779	$ 719,405
Contract assets for unbilled accounts receivable, net	81,437	85,843
Deferred revenue	$ 204,299	$ 158,363

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020	Oct. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 833,927	$ 894,053	$ 1,591,057	$ 1,726,965
Revenue recognized that was previously deferred			78,000	76,500
Capitalized contract acquisition costs	18,400		18,400		$ 15,300
Amortization of capitalized contract acquisition costs			10,700	10,100
UNITED STATES
Disaggregation of Revenue [Line Items]
Total revenue	$ 518,600	$ 598,400	$ 1,000,000	$ 1,100,000

Revenue - Performance Obligatio

Revenue - Performance Obligation (Details) $ in Millions	May 01, 2021USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 1,400
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-05-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of remaining performance obligation	83.00%
Period of remaining performance obligation	12 months

Canadian Emergency Wage Subsi_3

Canadian Emergency Wage Subsidy - Narrative (Details) $ in Thousands, $ in Millions	3 Months Ended			6 Months Ended
	May 01, 2021CAD ($)	May 01, 2021USD ($)	May 02, 2020USD ($)	May 01, 2021CAD ($)	May 01, 2021USD ($)	May 02, 2020USD ($)	May 01, 2021USD ($)
Canadian Emergency Wage Subsidy
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit	$ 51.1	$ 40,400	$ 0	$ 51.1	$ 40,400	$ 0
Amounts receivable from grant	$ 4.8			4.8			$ 3,900
Grants, Canada Emergency Wage Subsidy, 2020 Employee Wages
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit				$ 43.9	$ 34,700

Canadian Emergency Wage Subsi_4

Canadian Emergency Wage Subsidy - Schedule of Canadian Emergency Wage Subsidy (Details) - CEWS receivable $ in Thousands, $ in Millions	3 Months Ended			6 Months Ended
	May 01, 2021CAD ($)	May 01, 2021USD ($)	May 02, 2020USD ($)	May 01, 2021CAD ($)	May 01, 2021USD ($)	May 02, 2020USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit	$ 51.1	$ 40,400	$ 0	$ 51.1	$ 40,400	$ 0
Product
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		4,189	0		4,189	0
Service
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		2,620	0		2,620	0
CEWS benefit in cost of goods sold
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		6,809	0		6,809	0
Research and development
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		28,923	0		28,923	0
Sales and marketing
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		2,551	0		2,551	0
General and administrative
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		2,161	0		2,161	0
CEWS benefit in operating expense
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		$ 33,635	$ 0		$ 33,635	$ 0

Restructuring Costs (Details)

Restructuring Costs (Details) $ in Thousands	6 Months Ended
	May 01, 2021USD ($)employee	May 02, 2020USD ($)employee
Activity and balance of the restructuring liability accounts
Balance at beginning of period	$ 2,915	$ 15,143
Charges	14,076	8,283
Cash payments	(16,155)	(9,839)
Balance at end of period	836	2,427
Current restructuring liabilities	836	2,427
Cumulative Effect, Period of Adoption, Adjustment
Activity and balance of the restructuring liability accounts
Balance at beginning of period		(11,160)
Workforce reduction
Activity and balance of the restructuring liability accounts
Balance at beginning of period	2,915	3,983
Charges	2,617	4,426
Cash payments	(4,696)	(5,982)
Balance at end of period	836	2,427
Current restructuring liabilities	$ 836	$ 2,427
Number of employee reduction | employee	66	86
Workforce reduction | Cumulative Effect, Period of Adoption, Adjustment
Activity and balance of the restructuring liability accounts
Balance at beginning of period		$ 0
Consolidation of excess facilities and other restructuring activities
Activity and balance of the restructuring liability accounts
Balance at beginning of period	$ 0	11,160
Charges	11,459	3,857
Cash payments	(11,459)	(3,857)
Balance at end of period	0	0
Current restructuring liabilities	$ 0	0
Consolidation of excess facilities and other restructuring activities | Cumulative Effect, Period of Adoption, Adjustment
Activity and balance of the restructuring liability accounts
Balance at beginning of period		$ (11,160)

Interest and Other Income (Lo_3

Interest and Other Income (Loss), Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020
Other Income and Expenses [Abstract]
Interest income	$ 554	$ 2,023	$ 1,088	$ 5,413
Gains on non-hedge designated foreign currency forward contracts	5,180	1,086	9,709	1,723
Foreign currency exchange losses	(6,575)	(4,067)	(13,493)	(4,839)
Other	(433)	(1,707)	301	(1,316)
Interest and other income (loss), net	$ (1,274)	$ (2,665)	$ (2,395)	$ 981

Short-Term and Long-Term Inve_3

Short-Term and Long-Term Investments - Components of Investments (Details) - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 243,459
Estimated Fair Value	243,531
U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	243,459	$ 232,811
Gross Unrealized Gains	74	109
Gross Unrealized Losses	(2)	(27)
Estimated Fair Value	243,531	232,893
Included in short-term investments | U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	151,764	150,559
Gross Unrealized Gains	52	109
Gross Unrealized Losses	0	(1)
Estimated Fair Value	151,816	150,667
Included in long-term investments | U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	91,695	82,252
Gross Unrealized Gains	22	0
Gross Unrealized Losses	(2)	(26)
Estimated Fair Value	$ 91,715	$ 82,226

Short-Term and Long-Term Inve_4

Short-Term and Long-Term Investments - Legal Maturities of Debt Investments (Details) $ in Thousands	May 01, 2021USD ($)
Amortized Cost
Less than one year	$ 151,764
Due in 1-2 years	91,695
Amortized Cost	243,459
Estimated Fair Value
Less than one year	151,816
Due in 1-2 years	91,715
Estimated Fair Value	$ 243,531

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020
Assets:
Debt securities	$ 243,531
Fair value, Measurements, Recurring
Assets:
Deferred compensation plan assets	11,799	$ 8,213
Total assets measured at fair value	1,307,906	1,180,842
Liabilities:
Total liabilities measured at fair value	23,079	29,194
Fair value, Measurements, Recurring | Money market funds
Assets:
Cash equivalents	933,403	889,293
Fair value, Measurements, Recurring | Time deposits
Assets:
Cash equivalents	30,018
Fair value, Measurements, Recurring | Level 1
Assets:
Deferred compensation plan assets	11,799	8,213
Total assets measured at fair value	1,050,590	947,867
Liabilities:
Total liabilities measured at fair value	0	0
Fair value, Measurements, Recurring | Level 1 | Money market funds
Assets:
Cash equivalents	933,403	889,293
Fair value, Measurements, Recurring | Level 1 | Time deposits
Assets:
Cash equivalents	30,018
Fair value, Measurements, Recurring | Level 2
Assets:
Deferred compensation plan assets	0	0
Total assets measured at fair value	257,316	232,975
Liabilities:
Total liabilities measured at fair value	23,079	29,194
Fair value, Measurements, Recurring | Level 2 | Money market funds
Assets:
Cash equivalents	0	0
Fair value, Measurements, Recurring | Level 2 | Time deposits
Assets:
Cash equivalents	0
Fair value, Measurements, Recurring | Level 3
Assets:
Deferred compensation plan assets	0	0
Total assets measured at fair value	0	0
Liabilities:
Total liabilities measured at fair value	0	0
Fair value, Measurements, Recurring | Level 3 | Money market funds
Assets:
Cash equivalents	0	0
Fair value, Measurements, Recurring | Level 3 | Time deposits
Assets:
Cash equivalents	0
Foreign Currency Forward Contracts | Fair value, Measurements, Recurring
Assets:
Derivative asset	13,785	82
Liabilities:
Derivative liability	285	681
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	13,785	82
Liabilities:
Derivative liability	285	681
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		28,513
Forward Starting Interest Rate Swaps | Fair value, Measurements, Recurring
Liabilities:
Derivative liability	22,794
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	22,794	28,513
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	75,370	50,361
Bond mutual fund | Fair value, Measurements, Recurring | Level 1
Assets:
Debt securities	75,370	50,361
Bond mutual fund | Fair value, Measurements, Recurring | Level 2
Assets:
Debt securities	0	0
Bond mutual fund | Fair value, Measurements, Recurring | Level 3
Assets:
Debt securities	0	0
U.S. government obligations | Fair value, Measurements, Recurring
Assets:
Debt securities	243,531	232,893
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	243,531	232,893
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) - Fair value, Measurements, Recurring - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020
Assets:
Total assets measured at fair value	$ 1,307,906	$ 1,180,842
Liabilities:
Total liabilities measured at fair value	23,079	29,194
Cash equivalents
Assets:
Cash equivalents	1,038,791	939,654
Short-term investments
Assets:
Short-term investments	151,816	150,667
Prepaid expenses and other
Assets:
Other assets	13,785	82
Long-term investments
Assets:
Long-term investments	91,715
Other long-term assets
Assets:
Other assets	11,799	90,439
Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations	285	681
Other long-term obligations
Liabilities:
Other long-term obligations	22,794	28,513
Level 1
Assets:
Total assets measured at fair value	1,050,590	947,867
Liabilities:
Total liabilities measured at fair value	0	0
Level 1 | Cash equivalents
Assets:
Cash equivalents	1,038,791	939,654
Level 1 | Short-term investments
Assets:
Short-term investments	0	0
Level 1 | Prepaid expenses and other
Assets:
Other assets	0	0
Level 1 | Long-term investments
Assets:
Long-term investments	0
Level 1 | Other long-term assets
Assets:
Other assets	11,799	8,213
Level 1 | Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations	0	0
Level 1 | Other long-term obligations
Liabilities:
Other long-term obligations	0	0
Level 2
Assets:
Total assets measured at fair value	257,316	232,975
Liabilities:
Total liabilities measured at fair value	23,079	29,194
Level 2 | Cash equivalents
Assets:
Cash equivalents	0	0
Level 2 | Short-term investments
Assets:
Short-term investments	151,816	150,667
Level 2 | Prepaid expenses and other
Assets:
Other assets	13,785	82
Level 2 | Long-term investments
Assets:
Long-term investments	91,715
Level 2 | Other long-term assets
Assets:
Other assets	0	82,226
Level 2 | Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations	285	681
Level 2 | Other long-term obligations
Liabilities:
Other long-term obligations	22,794	28,513
Level 3
Assets:
Total assets measured at fair value	0	0
Liabilities:
Total liabilities measured at fair value	0	0
Level 3 | Cash equivalents
Assets:
Cash equivalents	0	0
Level 3 | Short-term investments
Assets:
Short-term investments	0	0
Level 3 | Prepaid expenses and other
Assets:
Other assets	0	0
Level 3 | Long-term investments
Assets:
Long-term investments	0
Level 3 | Other long-term assets
Assets:
Other assets	0	0
Level 3 | Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations	0	0
Level 3 | Other long-term obligations
Liabilities:
Other long-term obligations	$ 0	$ 0

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	6 Months Ended
	May 01, 2021	May 02, 2020	Oct. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 139,430		$ 119,481
Work-in-process	10,809		13,738
Finished goods	234,220		210,050
Deferred cost of goods sold	57,390		40,747
Gross inventories	441,849		384,016
Provision for excess and obsolescence	(40,616)		(39,637)
Inventories, net	401,233		$ 344,379
Provisions	$ 10,402	$ 12,640

Prepaid Expenses and Other (Det

Prepaid Expenses and Other (Details) - USD ($) $ in Thousands	6 Months Ended
	May 01, 2021	May 02, 2020	Oct. 31, 2020
Capitalized Contract Cost [Line Items]
Prepaid expenses	$ 77,389		$ 70,647
Prepaid VAT and other taxes	72,325		72,838
Product demonstration equipment, net	45,151		44,793
Other non-trade receivables	14,193		21,981
Derivative assets	13,785		82
Deferred deployment expense	421		604
Prepaid expenses and other	321,651		308,084
Depreciation of product demonstration equipment	5,100	$ 4,200
CEWS receivable
Capitalized Contract Cost [Line Items]
CEWS receivable	3,942		0
Contract assets for unbilled accounts receivable, net
Capitalized Contract Cost [Line Items]
Contract assets	81,437		85,843
Capitalized contract acquisition costs
Capitalized Contract Cost [Line Items]
Contract assets	$ 13,008		$ 11,296

Other Balance Sheet Details (De

Other Balance Sheet Details (Details) - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020	May 02, 2020	Nov. 02, 2019
Balance Sheet Related Disclosures [Abstract]
Compensation, payroll related tax and benefits	$ 114,119	$ 135,462
Warranty	48,123	49,868	$ 51,863	$ 48,498
Vacation	30,612	26,945
Finance lease obligations	3,245	2,836
Interest payable	665	672
Other	133,296	118,349
Total accrued liabilities and other short-term obligations	$ 330,060	$ 334,132

Other Balance Sheet Details - A

Other Balance Sheet Details - Accrued Warranty (Details) - USD ($) $ in Thousands	6 Months Ended
	May 01, 2021	May 02, 2020
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning Balance	$ 49,868	$ 48,498
Current Period Provisions	7,937	13,793
Settlements	(9,682)	(10,428)
Ending Balance	$ 48,123	$ 51,863

Other Balance Sheet Details - D

Other Balance Sheet Details - Deferred Revenue (Details) - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 204,299	$ 158,363
Less current portion	(147,075)	(108,700)
Long-term deferred revenue	57,224	49,663
Products
Disaggregation of Revenue [Line Items]
Deferred revenue	13,257	17,534
Services
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 191,042	$ 140,829

Derivative Instruments (Details

Derivative Instruments (Details) - USD ($) $ in Millions	6 Months Ended
	May 01, 2021	Oct. 31, 2020
Foreign Currency Forward Contracts | Designated as hedging instrument | Cash flow hedging
Derivative [Line Items]
Derivative asset, notional amount	$ 239.1	$ 254.9
Derivative maturity (in months)	24 months
Foreign Currency Forward Contracts | Not designated as hedging instrument
Derivative [Line Items]
Derivative asset, notional amount	$ 244.8	212
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	6 Months Ended
	May 01, 2021	May 02, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Equity - beginning balance	$ 2,509,597	$ 2,172,761
Other comprehensive gain (loss) before reclassifications	40,450	(41,671)
Amounts reclassified from AOCI	269	2,369
Equity- ending balance	2,693,263	2,240,576
Accumulated Other Comprehensive Gain (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Equity - beginning balance	(35,358)	(22,084)
Equity- ending balance	5,361	(61,386)
Unrealized Gain/(Loss) on Available- for -sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Equity - beginning balance	45	152
Other comprehensive gain (loss) before reclassifications	(7)	310
Amounts reclassified from AOCI	0	0
Equity- ending balance	38	462
Unrealized Gain (Loss) Derivatives | Foreign Currency Forward Contracts
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Equity - beginning balance	(219)	925
Other comprehensive gain (loss) before reclassifications	14,690	(9,559)
Amounts reclassified from AOCI	(4,256)	1,540
Equity- ending balance	10,215	(7,094)
Unrealized Gain (Loss) Derivatives | Forward Starting Interest Rate Swaps
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Equity - beginning balance	(21,535)	(13,686)
Other comprehensive gain (loss) before reclassifications	(494)	(10,932)
Amounts reclassified from AOCI	4,525	829
Equity- ending balance	(17,504)	(23,789)
Cumulative Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Equity - beginning balance	(13,649)	(9,475)
Other comprehensive gain (loss) before reclassifications	26,261	(21,490)
Amounts reclassified from AOCI	0	0
Equity- ending balance	$ 12,612	$ (30,965)

Leases - Narrative (Details)

Leases - Narrative (Details) ft² in Millions, $ in Millions	6 Months Ended
	May 01, 2021USD ($)ft²
Leases [Abstract]
Area leased (in sq ft) | ft²	1.3
Remaining lease term (up to)	11 years
Extension term (up to)	10 years
Termination period (up to)	5 years
ROU assets that involve subleased or vacant space | $	$ 4.6

Leases - Leases Included in the

Leases - Leases Included in the Balance Sheet (Details) - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020
Operating leases:
Operating ROU assets	$ 50,997	$ 57,026
Operating lease liabilities	73,159	80,450
Finance leases:
Buildings, gross	76,711	70,791
Less: accumulated depreciation	(21,771)	(17,837)
Buildings, net	$ 54,940	$ 52,954
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Equipment, building, furniture and fixtures, net	Equipment, building, furniture and fixtures, net
Finance lease liabilities	$ 68,271
Accrued liabilities and other short-term obligations
Finance leases:
Finance lease liabilities	68,271	$ 64,401
Other long-term obligations
Finance leases:
Finance lease liabilities	$ 68,271	$ 64,401

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020
Leases [Abstract]
Operating lease costs	$ 4,202	$ 4,744	$ 8,431	$ 9,201
Finance lease cost:
Amortization of finance ROU asset	1,191	1,093	2,356	2,233
Interest on finance lease liabilities	1,207	1,168	2,428	2,412
Total finance lease cost	2,398	2,261	4,784	4,645
Non-capitalized lease cost	333	707	626	1,328
Variable lease cost	1,452	1,324	3,051	2,635
Net lease cost	8,385	9,036	16,892	17,809
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Amortization	$ 2,600	$ 2,200	$ 4,900	$ 6,500

Leases - Leases Maturity (Detai

Leases - Leases Maturity (Details) - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020
Operating Leases
Remaining fiscal 2021	$ 10,772
2022	19,462
2023	16,020
2024	13,371
2025	9,058
Thereafter	9,434
Total lease payments	78,117
Less: Imputed interest	(4,958)
Present value of lease liabilities	73,159	$ 80,450
Less: Current portion of present value of minimum lease payments	(19,364)	(19,035)
Long-term portion of present value of minimum lease payments	53,795	61,415
Finance Leases
Remaining fiscal 2021	8,125
2022	8,623
2023	8,624
2024	8,693
2025	8,832
Thereafter	58,544
Total lease payments	101,441
Present value of lease liabilities	(33,170)
Present value of lease liabilities	68,271
Less: Current portion of present value of minimum lease payments	(3,245)	$ (2,836)
Long-term portion of present value of minimum lease payments	65,026
Lease, Liability, Payment, Due [Abstract]
Remaining fiscal 2021	18,897
2022	28,085
2023	24,644
2024	22,064
2025	17,890
Thereafter	67,978
Total lease payments	179,558
Less: Imputed interest	(38,128)
Present value of lease liabilities	141,430
Less: Current portion of present value of minimum lease payments	(22,609)
Long-term portion of present value of minimum lease payments	$ 118,821

Leases - Weighted Average Remai

Leases - Weighted Average Remaining Lease Terms and Discount Rates (Details)	May 01, 2021	Oct. 31, 2020
Weighted-average remaining lease term in years:
Operating leases	4 years 6 months 10 days	4 years 10 months 13 days
Finance leases	11 years 2 months 19 days	11 years 8 months 15 days
Weighted-average discount rates:
Operating leases	2.79%	2.82%
Finance leases	7.56%	7.56%

Short-Term and Long-Term Debt -

Short-Term and Long-Term Debt - Debt Components (Details) - Secured debt - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020	Jan. 23, 2020
Debt Instrument [Line Items]
Deferred Debt Issuance Costs	$ (2,600)	$ (2,900)
2025 Term Loan
Debt Instrument [Line Items]
Principal Balance	684,337		$ 693,000
Unamortized Debt Discount	(1,414)
Deferred Debt Issuance Costs	(2,638)
Net Carrying Value	$ 680,285	$ 683,286

Short-Term and Long-Term Debt_2

Short-Term and Long-Term Debt (Details) - Secured debt - USD ($) $ in Thousands	6 Months Ended
	May 01, 2021	May 02, 2020	Oct. 31, 2020	Jan. 23, 2020
Debt Instrument [Line Items]
Debt issuance costs, net	$ 2,600		$ 2,900
Amortization of debt issuance costs	300	$ 300
2025 Term Loan
Debt Instrument [Line Items]
Aggregate principal amount	684,337			$ 693,000
Debt issuance costs, net	2,638
Fair value of debt	$ 685,200

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		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020
Earnings Per Share [Abstract]
Net income	$ 103,117	$ 91,655	$ 158,465	$ 153,983
Basic weighted average shares outstanding (in shares)	155,331	153,858	155,257	154,099
Effect of dilutive potential common shares (in shares)	1,545	1,283	1,477	1,344
Dilutive weighted average shares (in shares)	156,876	155,141	156,734	155,443
Basic EPS (in dollars per share)	$ 0.66	$ 0.60	$ 1.02	$ 1
Diluted EPS (in dollars per share)	$ 0.66	$ 0.59	$ 1.01	$ 0.99
Antidilutive employee share-based awards, excluded (in shares)	30	203	82	467

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($)	6 Months Ended
	May 01, 2021	May 02, 2020	Dec. 13, 2018
Equity [Abstract]
Stock repurchase program authorized amount			$ 500,000,000
Payments for repurchase of common stock	$ 27,893,000	$ 18,200,000

Stockholders' Equity - Summary

Stockholders' Equity - Summary of the Stock Repurchase Program (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	May 01, 2021USD ($)$ / sharesshares
Shares Repurchased
Cumulative beginning balance (in shares) | shares	5,710,912
Repurchase of common stock under the stock repurchase program (in shares) | shares	735,075
Cumulative ending balance (in shares) | shares	6,445,987
Weighted-Average Price per Share
Cumulative beginning balance (in dollars per share) | $ / shares	$ 39.33
Repurchase of common stock under the stock repurchase program (in dollars per share) | $ / shares	53.60
Cumulative ending balance (in dollars per share) | $ / shares	$ 40.96
Amount Repurchased (in thousands)
Cumulative beginning balance | $	$ 224,611
Repurchase of common stock under the stock repurchase program | $	39,398
Cumulative ending balance | $	$ 264,009

Share-Based Compensation Expe_3

Share-Based Compensation Expense - Expense in Period (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense capitalized in inventory, net	$ 419	$ 53	$ 257	$ 153
Total share-based compensation	21,535	17,977	40,499	33,579
CEWS benefit in cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	1,919	1,863	4,077	3,376
Product
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	498	827	1,451	1,498
Service
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	1,421	1,036	2,626	1,878
CEWS benefit in operating expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	19,197	16,061	36,165	30,050
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	5,844	4,822	10,638	8,671
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	6,610	5,264	12,426	9,877
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 6,743	$ 5,975	$ 13,101	$ 11,502

Share-Based Compensation Expe_4

Share-Based Compensation Expense (Details) shares in Millions, $ in Millions	Jan. 29, 2021shares	May 01, 2021USD ($)purchase_period
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offer period		12 months
Number of purchase periods | purchase_period		2
Purchase period		6 months
Purchase price of common stock		85.00%
Increase in number of shares authorized (in shares) | shares	8.7
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation | $		$ 155.6
Weighted-average period for recognition of share-based compensation (in years)		1 year 6 months 25 days

Segments and Entity-Wide Disc_3

Segments and Entity-Wide Disclosures (Details) $ in Thousands	6 Months Ended
	May 01, 2021USD ($)segment	Oct. 31, 2020USD ($)
Segment Reporting [Abstract]
Equipment, building, furniture and fixtures, net	$ 298,329	$ 272,377
Operating right-of-use assets	$ 50,997	$ 57,026
Number of operating segments | segment	4

Segments and Entity-Wide Disc_4

Segments and Entity-Wide Disclosures - Other Intangibles Assets, Goodwill and Maintenance Spares (Details) - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020
Segment Reporting Information [Line Items]
Other intangible assets, net	$ 82,879
Goodwill	311,734	$ 310,847
Maintenance spares, net	63,003
Operating Segments | Networking Platforms
Segment Reporting Information [Line Items]
Other intangible assets, net	11,395
Goodwill	66,493
Maintenance spares, net	0
Operating Segments | Platform Software and Services
Segment Reporting Information [Line Items]
Other intangible assets, net	0
Goodwill	156,191
Maintenance spares, net	0
Operating Segments | Blue Planet Automation Software and Services
Segment Reporting Information [Line Items]
Other intangible assets, net	71,484
Goodwill	89,050
Maintenance spares, net	0
Operating Segments | Global Services
Segment Reporting Information [Line Items]
Other intangible assets, net	0
Goodwill	0
Maintenance spares, net	$ 63,003

Segments and Entity-Wide Disc_5

Segments and Entity-Wide Disclosures - Revenue, Profit (Loss) and Net Income (Loss) Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020
Less: Non-performance operating expenses
Selling and marketing	$ 110,387	$ 101,214	$ 207,665	$ 208,280
General and administrative	43,635	42,030	83,628	84,498
Amortization of intangible assets	6,019	5,839	11,929	11,692
Significant asset impairments and restructuring costs	8,209	3,811	14,076	8,283
Acquisition and integration costs	294	1,414	601	3,233
Add: Other non-performance financial items
Interest expense and other income (loss), net	(9,059)	(10,525)	(17,540)	(15,694)
Loss on extinguishment and modification of debt	0	0	0	(646)
Less: Provision for income taxes	21,453	25,308	33,419	35,122
Net income	103,117	91,655	158,465	153,983
Operating Segments
Add: Other non-performance financial items
Net income	302,173	281,796	527,323	521,431
Operating Segments | Networking Platforms
Add: Other non-performance financial items
Net income	211,412	210,987	367,843	379,256
Operating Segments | Platform Software and Services
Add: Other non-performance financial items
Net income	36,506	21,668	64,166	50,619
Operating Segments | Blue Planet Automation Software and Services
Add: Other non-performance financial items
Net income	5,688	(4,399)	3,254	(7,512)
Operating Segments | Global Services
Add: Other non-performance financial items
Net income	$ 48,567	$ 53,540	$ 92,060	$ 99,068

Segments and Entity-Wide Disc_6

Segments and Entity-Wide Disclosures - Geographic Distribution of Equipment, Building, Furniture and Fixtures (Details) - USD ($) $ in Thousands	May 01, 2021	Oct. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net	$ 349,326	$ 329,403
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net	247,309	214,188
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net	59,229	65,321
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net	$ 42,788	$ 49,894

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands, $ in Millions	3 Months Ended		6 Months Ended			50 Months Ended
	May 01, 2021USD ($)	May 02, 2020USD ($)	May 01, 2021USD ($)government_entity	May 01, 2021CAD ($)government_entity	May 02, 2020USD ($)	May 01, 2021USD ($)	May 01, 2021CAD ($)	May 01, 2021CAD ($)
Loss Contingencies [Line Items]
Total revenue | $	$ 833,927	$ 894,053	$ 1,591,057		$ 1,726,965
Canadian Grant
Loss Contingencies [Line Items]
Maximum amount of Canadian grant	46,900		$ 46,900			$ 46,900		$ 57.6
Number of Canadian government entities | government_entity			3	3
Total revenue			$ 3,800	$ 4.9		37,000	$ 45.5
Amounts receivable from grant	$ 2,200		$ 2,200			$ 2,200		$ 2.7

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Jun. 04, 2021	May 01, 2021	Oct. 31, 2020
Subsequent Event [Line Items]
Stock repurchases (in shares)		735,075
Stock repurchases		$ 39,398
Average price of shares repurchased (in dollars per share)		$ 53.60
Aggregate shares repurchased (in shares)		6,445,987	5,710,912
Subsequent event
Subsequent Event [Line Items]
Stock repurchases (in shares)	195,920
Stock repurchases	$ 10,400
Average price of shares repurchased (in dollars per share)	$ 52.84
Aggregate shares repurchased (in shares)	6,641,907
Authorized funds remaining under stock repurchase program	$ 225,600