Ciena (CIEN) 10-Q 7 Mar 24 2024 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Jan. 27, 2024	Mar. 01, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jan. 27, 2024
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		144,602,692
Entity Central Index Key	0000936395
Current Fiscal Year End Date	--11-02
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Revenue:
Total revenue	$ 1,037,709	$ 1,056,521
Cost of goods sold:
Total cost of goods sold	570,747	600,575
Gross profit	466,962	455,946
Operating expenses:
Research and development	187,269	181,730
Selling and marketing	128,158	123,807
General and administrative	54,683	50,896
Significant asset impairments and restructuring costs	4,971	4,298
Amortization of intangible assets	7,252	7,441
Acquisition and integration costs	0	2,558
Total operating expenses	382,333	370,730
Income from operations	84,629	85,216
Interest and other income, net	10,650	31,973
Interest expense	(23,776)	(15,870)
Income before income taxes	71,503	101,319
Provision for income taxes	21,956	25,078
Net income	$ 49,547	$ 76,241
Basic net income per common share (in dollars per share)	$ 0.34	$ 0.51
Diluted net income per potential common share (in dollars per share)	$ 0.34	$ 0.51
Weighted average basic common shares outstanding (in shares)	145,291	149,081
Weighted average dilutive potential common shares outstanding (in shares)	145,848	149,551
Products
Revenue:
Total revenue	$ 835,777	$ 877,715
Cost of goods sold:
Total cost of goods sold	466,472	500,337
Services
Revenue:
Total revenue	201,932	178,806
Cost of goods sold:
Total cost of goods sold	$ 104,275	$ 100,238

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Net income	$ 49,547	$ 76,241
Unrealized gain on available-for-sale securities, net of tax	895	1,050
Change in cumulative translation adjustments	14,323	15,979
Other comprehensive income	12,900	17,346
Total comprehensive income	62,447	93,587
Unrealized gain on foreign currency forward contracts, net of tax
Change in unrealized gain (loss) on cash flow hedges, net of tax	7,156	5,342
Unrealized loss on interest rate swaps, net of tax
Change in unrealized gain (loss) on cash flow hedges, net of tax	$ (9,474)	$ (5,025)

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jan. 27, 2024	Oct. 28, 2023
Current assets:
Cash and cash equivalents	$ 1,264,751	$ 1,010,618
Short-term investments	106,678	104,753
Accounts receivable, net of allowance for credit losses of $14.3 million and $11.7 million as of January 27, 2024 and October 28, 2023, respectively.	865,239	1,003,876
Inventories, net	984,886	1,050,838
Prepaid expenses and other	387,193	405,694
Total current assets	3,608,747	3,575,779
Long-term investments	103,862	134,278
Equipment, building, furniture and fixtures, net	280,357	280,147
Operating right-of-use assets	35,679	35,140
Goodwill	445,084	444,765
Other intangible assets, net	195,682	205,627
Deferred tax asset, net	814,098	809,306
Other long-term assets	109,701	116,453
Total assets	5,593,210	5,601,495
Current liabilities:
Accounts payable	316,094	317,828
Accrued liabilities and other short-term obligations	329,910	431,419
Deferred revenue	166,714	154,419
Operating lease liabilities	16,888	16,655
Current portion of long-term debt	11,700	11,700
Total current liabilities	841,306	932,021
Long-term deferred revenue	76,556	74,041
Other long-term obligations	176,313	170,407
Long-term operating lease liabilities	32,418	33,259
Long-term debt, net	1,543,118	1,543,406
Total liabilities	2,669,711	2,753,134
Commitments and contingencies (Note 19)
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; 144,946,510 and 144,829,938 shares issued and outstanding	1,449	1,448
Additional paid-in capital	6,274,773	6,262,083
Accumulated other comprehensive loss	(24,867)	(37,767)
Accumulated deficit	(3,327,856)	(3,377,403)
Total stockholders’ equity	2,923,499	2,848,361
Total liabilities and stockholders’ equity	$ 5,593,210	$ 5,601,495

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jan. 27, 2024	Oct. 28, 2023
Statement of Financial Position [Abstract]
Allowance for credit losses	$ 14.3	$ 11.7
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 outstanding (in shares)	144,946,510	144,829,938
Common stock, shares issued (in shares)	144,946,510	144,829,938

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Cash flows provided by (used in) operating activities:
Net income	$ 49,547	$ 76,241
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation of equipment, building, furniture and fixtures, and amortization of leasehold improvements	22,808	22,208
Share-based compensation costs	37,827	30,512
Amortization of intangible assets	10,016	10,325
Deferred taxes	(4,368)	(7,247)
Provision for inventory excess and obsolescence	10,350	5,503
Provision for warranty	4,841	8,230
Gain on cost method equity investments, net	0	(26,455)
Other	5,051	7,325
Changes in assets and liabilities:
Accounts receivable	135,160	(133,067)
Inventories	56,157	(235,059)
Prepaid expenses and other	17,116	4,667
Operating lease right-of-use assets	3,084	3,891
Accounts payable, accruals and other obligations	(90,915)	(56,979)
Deferred revenue	14,022	29,459
Short- and long-term operating lease liabilities	(4,620)	(5,193)
Net cash provided by (used in) operating activities	266,076	(265,639)
Cash flows provided by (used in) investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(16,599)	(30,030)
Purchases of investments	(21,213)	(35,411)
Proceeds from sales and maturities of investments	53,674	123,249
Settlement of foreign currency forward contracts, net	2,271	(4,001)
Acquisition of business, net of cash acquired	0	(230,048)
Net cash provided by (used in) investing activities	18,133	(176,241)
Cash flows provided by (used in) financing activities:
Proceeds from issuance of term loan, net	0	497,500
Payment of long-term debt	0	(1,732)
Payment of debt issuance costs	(2,402)	(3,996)
Payment of finance lease obligations	(981)	(913)
Shares repurchased for tax withholdings on vesting of stock unit awards	(10,076)	(12,980)
Repurchases of common stock - repurchase program, net	(38,195)	0
Proceeds from issuance of common stock	16,934	14,315
Net cash provided by (used in) financing activities	(34,720)	492,194
Effect of exchange rate changes on cash, cash equivalents and restricted cash	4,646	9,884
Net increase in cash, cash equivalents and restricted cash	254,135	60,198
Cash, cash equivalents and restricted cash at beginning of period	1,010,786	994,378
Cash, cash equivalents and restricted cash at end of period	1,264,921	1,054,576
Supplemental disclosure of cash flow information
Cash paid during the period for interest, net	18,582	10,536
Cash paid during the period for income taxes, net	8,260	8,383
Operating lease payments	5,080	5,638
Non-cash investing and financing activities
Purchase of equipment in accounts payable	4,225	7,354
Repurchase of common stock in accrued liabilities from repurchase program	3,110	0
Operating right-of-use assets subject to lease liability	3,498	6,244
Gain on cost method equity investments, net	$ 0	$ 26,455

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Oct. 29, 2022		148,412,943
Equity - beginning balance at Oct. 29, 2022	$ 2,712,861	$ 1,484	$ 6,390,252	$ (46,645)	$ (3,632,230)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	76,241				76,241
Other comprehensive income	17,346			17,346
Issuance of shares from employee equity plans (in shares)		1,009,649
Issuance of shares from employee equity plans	14,315	$ 11	14,304
Share-based compensation expense	30,512		30,512
Shares repurchased for tax withholdings on vesting of stock unit awards (in shares)		(265,004)
Shares repurchased for tax withholdings on vesting of stock unit awards	(12,980)	$ (3)	(12,977)
Ending balance (in shares) at Jan. 28, 2023		149,157,588
Equity- ending balance at Jan. 28, 2023	$ 2,838,295	$ 1,492	6,422,091	(29,299)	(3,555,989)
Beginning balance (in shares) at Oct. 28, 2023	144,829,938	144,829,938
Equity - beginning balance at Oct. 28, 2023	$ 2,848,361	$ 1,448	6,262,083	(37,767)	(3,377,403)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	49,547				49,547
Other comprehensive income	12,900			12,900
Repurchase of common stock - repurchase program, net (in shares)		(691,088)
Repurchase of common stock - repurchase program, net	(31,994)	$ (7)	(31,987)
Issuance of shares from employee equity plans (in shares)		1,039,765
Issuance of shares from employee equity plans	16,934	$ 10	16,924
Share-based compensation expense	37,827		37,827
Shares repurchased for tax withholdings on vesting of stock unit awards (in shares)		(232,105)
Shares repurchased for tax withholdings on vesting of stock unit awards	$ (10,076)	$ (2)	(10,074)
Ending balance (in shares) at Jan. 27, 2024	144,946,510	144,946,510
Equity- ending balance at Jan. 27, 2024	$ 2,923,499	$ 1,449	$ 6,274,773	$ (24,867)	$ (3,327,856)

INTERIM FINANCIAL STATEMENTS

INTERIM FINANCIAL STATEMENTS	3 Months Ended
	Jan. 27, 2024
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. 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 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 28, 2023 was derived from audited financial statements, but does not include all disclosures required by GAAP. However, Ciena believes that the disclosures are adequate to understand the information presented herein. The operating results for interim periods are not necessarily indicative of the operating results for the entire year. These financial statements should be read in conjunction with Ciena’s audited consolidated financial statements and the notes thereto included in Ciena’s Annual Report on Form 10-K for the fiscal year ended October 28, 2023 (the “2023 Annual Report”).

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Jan. 27, 2024
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 2023 Annual Report. Newly Issued Accounting Standards - Effective In October 2021, the FASB issued ASU No. 2021-08 (“ASU 2021-08”), Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers to improve the accounting for acquired revenue contracts with customers in a business combination to address recognition of an acquired contract liability and payment terms and their effect on subsequent revenue recognized by the acquirer. ASU 2021-08 was effective for Ciena beginning in the first quarter of fiscal 2024 without any material impact on its consolidated financial position, results of operations and related disclosures. Newly Issued Accounting Standards - Not Yet Effective In November 2023, the FASB issued ASU No. 2023-07 (“ASU 2023-07”), Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023 on a retrospective basis. Early adoption is permitted. Ciena is currently evaluating the impact of this accounting standard update on its consolidated financial statements and related disclosures. In December 2023, the FASB issued ASU No. 2023-09 (“ASU 2023-09”), Income Taxes (Topic 740): Improvement to Income Tax Disclosures to enhance the transparency and decision usefulness of income tax disclosures. ASU 2023-09 is effective for annual periods beginning after December 15, 2024; however, early adoption is permitted. ASU 2023-09 allows for

REVENUE

REVENUE	3 Months Ended
	Jan. 27, 2024
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE Disaggregation of Revenue Ciena’s disaggregated revenue as presented below depicts the nature, amount, and timing of revenue and cash flows for similar groupings of Ciena’s various offerings. The sales cycle, contractual obligations, customer requirements, and go-to-market strategies may differ for each of its product categories, resulting in different economic risk profiles for each category. The tables below set forth Ciena’s disaggregated revenue for the respective periods (in thousands): Quarter Ended January 27, 2024 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Optical Networking $ 695,849 $ — $ — $ — $ 695,849 Routing and Switching 111,387 — — — 111,387 Platform Software and Services — 89,745 — — 89,745 Blue Planet Automation Software and Services — — 13,942 — 13,942 Maintenance Support and Training — — — 74,115 74,115 Installation and Deployment — — — 42,723 42,723 Consulting and Network Design — — — 9,948 9,948 Total revenue by product line $ 807,236 $ 89,745 $ 13,942 $ 126,786 $ 1,037,709 Timing of revenue recognition: Products and services at a point in time $ 807,236 $ 27,694 $ 1,069 $ 9,638 $ 845,637 Services transferred over time — 62,051 12,873 117,148 192,072 Total revenue by timing of revenue recognition $ 807,236 $ 89,745 $ 13,942 $ 126,786 $ 1,037,709 Quarter Ended January 28, 2023 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Optical Networking $ 735,634 $ — $ — $ — $ 735,634 Routing and Switching 119,505 — — — 119,505 Platform Software and Services — 73,445 — — 73,445 Blue Planet Automation Software and Services — — 15,405 — 15,405 Maintenance Support and Training — — — 67,891 67,891 Installation and Deployment — — — 34,575 34,575 Consulting and Network Design — — — 10,066 10,066 Total revenue by product line $ 855,139 $ 73,445 $ 15,405 $ 112,532 $ 1,056,521 Timing of revenue recognition: Products and services at a point in time $ 855,139 $ 18,864 $ 3,982 $ 9,255 $ 887,240 Services transferred over time — 54,581 11,423 103,277 169,281 Total revenue by timing of revenue recognition $ 855,139 $ 73,445 $ 15,405 $ 112,532 $ 1,056,521 Ciena reports its sales geographically using the following markets: (i) the United States, Canada, the Caribbean and Latin America (“Americas”); (ii) Europe, Middle East and Africa (“EMEA”); and (iii) Asia Pacific, Japan and India (“APAC”). 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 January 27, January 28, 2024 2023 Geographic distribution: Americas $ 718,198 $ 765,096 EMEA 207,413 152,804 APAC 112,098 138,621 Total revenue by geographic distribution $ 1,037,709 $ 1,056,521 Ciena’s revenue includes $677.6 million and $693.6 million of United States revenue for the first quarter of fiscal 2024 and 2023, 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 January 27, January 28, 2024 2023 Cloud provider A $ 166,008 n/a Cloud provider B 109,098 121,327 AT&T n/a 149,981 Total $ 275,106 $ 271,308 _____________________________________ n/a Denotes revenue representing less than 10% of total revenue for the period The cloud providers noted in the above table purchased products from each of Ciena’s operating segments excluding Blue Planet ® Automation Software and Services. AT&T purchased products and services from each of Ciena’s operating segments for the period presented. • Networking Platforms revenue reflects sales of Ciena’s Optical Networking and Routing and Switching product lines. • Optical Networking - includes the 6500 Packet-Optical Platform, the Waveserver® modular interconnect system, the 6500 Reconfigurable Line System (RLS), the 5400 family of Packet-Optical Platforms, and the Coherent ELS open line system (OLS). This product line also includes the WaveLogic 5 Nano (WL5n) 100G-400G coherent pluggable transceivers. • Routing and Switching - includes the 3000 family of service delivery platforms and the 5000 family of service aggregation. This product line also includes the 6500 Packet Transport System (PTS), which combines packet switching, control plane operation, and integrated optics, the 8100 Coherent IP networking platforms, the 8700 Packetwave Platform, and virtualization software. This product line also includes SD-Edge software and our microplug Optical Line Terminal (OLT) transceiver. This product line also includes Ciena’s WaveRouter TM product, which was introduced during fiscal 2023, for which there have been no material sales to date. 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 offerings provide domain control management, analytics, data and planning tools and applications to assist customers in managing their networks, including by creating more efficient operations and providing more proactive visibility into their networks. Ciena’s platform software includes its Navigator Network Control Suite TM (“Navigator NCS”) domain controller solution, its suite of Navigator NCS applications, which was previously referred to as “Manage, Control and Plan (MCP),” and its OneControl Unified Management System, as well as planning tools and 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, cloud native, and standards-based software portfolio, together with related services, that enables customers to realize digital transformation through the automation of the services lifecycle. Ciena’s Blue Planet Automation Platform includes multi-domain service orchestration (MDSO), inventory management (BPI), route optimization and analysis (ROA), multi-cloud orchestration (MCO), 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 January 27, 2024 Balance at October 28, 2023 Accounts receivable, net $ 865,239 $ 1,003,876 Contract assets for unbilled accounts receivable, net $ 151,572 $ 150,312 Deferred revenue $ 243,270 $ 228,460 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 on the Condensed Consolidated Balance Sheets. See Note 10 below. Contract liabilities consist of deferred revenue and represent advanced payments against non-cancelable customer orders received prior to revenue recognition. Ciena recognized approximately $70.6 million and $67.9 million of revenue during the first three months of fiscal 2024 and 2023, respectively, that was included in the deferred revenue balance at October 28, 2023 and October 29, 2022, respectively . Revenue recognized due to changes in transaction price from performance obligations satisfied or partially satisfied in previous periods was immaterial during the three months ended January 27, 2024 and January 28, 2023. Capitalized Contract Acquisition Costs Capitalized contract acquisition costs consist of deferred sales commissions, and were $27.8 million and $30.2 million as of January 27, 2024 and October 28, 2023, respectively. Capitalized contract acquisition costs were included in (i) prepaid expenses and other and (ii) other long-term assets on the Condensed Consolidated Balance Sheets. The amortization expense associated with these costs was $7.7 million and $7.2 million during the first three months of fiscal 2024 and 2023, respectively, and was included in selling and marketing expense on the Condensed Consolidated Statements of Operations. Remaining Performance Obligations Remaining performance obligations (“RPO”) are comprised of non-cancelable customer purchase orders for products and services that are awaiting transfer of control for revenue recognition under the applicable contract terms. As of January 27, 2024, the aggregate amount of RPO was $1.7 billion. As of January 27, 2024, Ciena expects approximately 83% of the RPO to be recognized as revenue within the next 12 months.

SIGNIFICANT ASSET IMPAIRMENT AN

SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS	3 Months Ended
	Jan. 27, 2024
Restructuring and Related Activities [Abstract]
SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS	SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS Restructuring Costs Ciena has undertaken a number of restructuring activities intended to reduce expense and to 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 the Condensed Consolidated Balance Sheets, for the three months ended January 27, 2024 (in thousands): Workforce Other restructuring activities Total Balance at October 28, 2023 $ 1,913 $ — $ 1,913 Charges 2,861 (1) 2,110 (2) 4,971 Cash payments (4,058) (2,110) (6,168) Balance at January 27, 2024 $ 716 $ — $ 716 Current restructuring liabilities $ 716 $ — $ 716 (1) Reflects employee costs associated with workforce reductions during the three months ended January 27, 2024 as part of a business optimization strategy to improve gross margin, constrain operating expense, and redesign certain business processes. (2) Primarily represents costs related to restructured real estate facilities and the redesign of certain business processes associated with Ciena’s supply chain and distribution structure reorganization. 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 the Condensed Consolidated Balance Sheets for the three months ended January 28, 2023 (in thousands): Workforce Other restructuring activities Total Balance at October 29, 2022 $ 1,215 $ 4,620 $ 5,835 Charges 704 (1) 3,594 (2) 4,298 Cash payments (1,498) (8,214) (9,712) Balance at January 28, 2023 $ 421 $ — $ 421 Current restructuring liabilities $ 421 $ — $ 421 (1) Reflects employee costs associated with workforce reductions during the three months ended January 28, 2023 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 associated with Ciena’s supply chain and distribution structure reorganization and costs related to restructured real estate facilities.

INTEREST AND OTHER INCOME, NET

INTEREST AND OTHER INCOME, NET	3 Months Ended
	Jan. 27, 2024
Other Income and Expenses [Abstract]
INTEREST AND OTHER INCOME, NET	INTEREST AND OTHER INCOME, NET The components of interest and other income, net, are as follows for the periods indicated (in thousands): Quarter Ended January 27, January 28, 2024 2023 Interest income $ 15,177 $ 7,121 Gains (losses) on non-hedge designated foreign currency forward contracts 3,112 (1,769) Foreign currency exchange losses (9,192) (1,889) Gain on cost method equity investments, net — 26,455 Other 1,553 2,055 Interest and other income, net $ 10,650 $ 31,973 During the first quarter of fiscal 2023, the acquisition of Tibit Communications, Inc. (“Tibit”) by Ciena triggered the remeasurement of Ciena’s previously held investment in Tibit to fair value, which resulted in Ciena recognizing a gain on its cost method equity investment of $26.5 million. 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 $9.2 million and $1.9 million d uring the first three months of fiscal 2024 and fiscal 2023 , respectively, in foreign currency exchange rate losses a s 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, net, on the Condensed Consolidated Statements of Operations. From time to time, Ciena uses foreign currency forwards to hedge this type of balance sheet exposure. These forwards are not designated as hedges for accounting purposes, and any net gain or loss associated with these derivatives is reported in interest and other income, net, on the Condensed Consolidated Statements of Operations.

INCOME TAXES

INCOME TAXES	3 Months Ended
	Jan. 27, 2024
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The effective tax rate for the quarter ended January 27, 2024 was higher than the effective tax rate for the quarter ended January 28, 2023, primarily due to the tax benefit of a gain on a cost method equity investment in the first quarter of fiscal 2023.

CASH EQUIVALENT, SHORT-TERM AND

CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS	3 Months Ended
	Jan. 27, 2024
Investments, Debt and Equity Securities [Abstract]
CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS	CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS As of the dates indicated, investments are comprised of the following (in thousands): January 27, 2024 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations $ 141,947 $ 759 $ (82) $ 142,624 Corporate debt securities 57,604 40 (25) 57,619 Time deposits 144,106 20 — 144,126 $ 343,657 $ 819 $ (107) $ 344,369 Included in cash equivalents $ 133,829 $ — $ — $ 133,829 Included in short-term investments 106,603 143 (68) 106,678 Included in long-term investments 103,225 676 (39) 103,862 $ 343,657 $ 819 $ (107) $ 344,369 October 28, 2023 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations $ 170,260 $ 28 $ (379) $ 169,909 Corporate debt securities 59,683 1 (115) 59,569 Time deposits 138,830 4 (5) 138,829 $ 368,773 $ 33 $ (499) $ 368,307 Included in cash equivalents $ 129,276 $ — $ — $ 129,276 Included in short-term investments 105,042 4 (293) 104,753 Included in long-term investments 134,455 29 (206) 134,278 $ 368,773 $ 33 $ (499) $ 368,307 The following table summarizes the final legal maturities of debt investments as of January 27, 2024 (in thousands): Amortized Estimated Less than one year $ 240,433 $ 240,507 Due in 1-2 years 103,224 103,862 $ 343,657 $ 344,369

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Jan. 27, 2024
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS As of the dates indicated, the following tables summarize the assets and liabilities that are recorded at fair value on a recurring basis (in thousands): January 27, 2024 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 895,909 $ — $ — $ 895,909 Bond mutual fund 156,300 — — 156,300 Time deposits 144,126 — — 144,126 Deferred compensation plan assets 14,614 — — 14,614 U.S. government obligations — 142,624 — 142,624 Corporate debt securities — 57,619 — 57,619 Foreign currency forward contracts — 3,020 — 3,020 Interest rate swaps — 12,501 — 12,501 Total assets measured at fair value $ 1,210,949 $ 215,764 $ — $ 1,426,713 Liabilities: Foreign currency forward contracts $ — $ 6,184 $ — $ 6,184 Total liabilities measured at fair value $ — $ 6,184 $ — $ 6,184 October 28, 2023 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 661,101 $ — $ — $ 661,101 Bond mutual fund 104,171 — — 104,171 Time deposits 138,829 — — 138,829 Deferred compensation plan assets 11,456 — — 11,456 U.S. government obligations — 169,909 — 169,909 Corporate debt securities — 59,569 — 59,569 Foreign currency forward contracts — 1,119 — 1,119 Interest rate swaps — 24,953 — 24,953 Total assets measured at fair value $ 915,557 $ 255,550 $ — $ 1,171,107 Liabilities: Foreign currency forward contracts $ — $ 14,509 $ — $ 14,509 Total liabilities measured at fair value $ — $ 14,509 $ — $ 14,509 As of the dates indicated, the assets and liabilities above are presented on Ciena’s Condensed Consolidated Balance Sheets as follows (in thousands): January 27, 2024 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 1,183,109 $ 2,929 $ — $ 1,186,038 Short-term investments 13,226 93,452 — 106,678 Prepaid expenses and other — 3,020 — 3,020 Long-term investments — 103,862 — 103,862 Other long-term assets 14,614 12,501 — 27,115 Total assets measured at fair value $ 1,210,949 $ 215,764 $ — $ 1,426,713 Liabilities: Accrued liabilities and other short-term obligations $ — $ 6,184 $ — $ 6,184 Total liabilities measured at fair value $ — $ 6,184 $ — $ 6,184 October 28, 2023 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 891,788 $ 2,760 $ — $ 894,548 Short-term investments 12,313 92,440 — 104,753 Prepaid expenses and other — 1,119 — 1,119 Long-term investments — 134,278 — 134,278 Other long-term assets 11,456 24,953 — 36,409 Total assets measured at fair value $ 915,557 $ 255,550 $ — $ 1,171,107 Liabilities: Accrued liabilities and other short-term obligations $ — $ 14,509 $ — $ 14,509 Total liabilities measured at fair value $ — $ 14,509 $ — $ 14,509 Ciena did not have any transfers between Level 1 and Level 2 fair value measurements during the periods presented.

INVENTORIES

INVENTORIES	3 Months Ended
	Jan. 27, 2024
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES As of the dates indicated, inventories are comprised of the following (in thousands): January 27, October 28, Raw materials $ 571,666 $ 664,797 Work-in-process 60,644 55,242 Finished goods 369,771 314,168 Deferred cost of goods sold 36,824 66,634 Gross inventories 1,038,905 1,100,841 Reserve for inventory excess and obsolescence (54,019) (50,003) Inventories, net $ 984,886 $ 1,050,838 Ciena has been expanding its manufacturing capacity and had been accumulating raw materials inventory of components that are available, in some cases with expanded lead times, in an effort to prepare Ciena to produce finished goods more quickly upon the easing of supply constraints for certain common components. During the first quarter of fiscal 2024 Ciena reduced its raw materials inventory of components due to the consumption of raw materials in excess of purchases. The increase in finished goods inventories resulted primarily from planned fulfillment of customer advance orders for which some deliveries have been rescheduled outside of the first quarter of fiscal 2024. Ciena makes estimates about future customer demand for its products when establishing the appropriate reserve for excess and obsolete inventory. For the periods presented, future demand was calculated using both customer backlog and future forecasted sales. Generally, Ciena’s customers may cancel or change their orders with limited advance notice, or they may decide not to accept its products and services, although instances of both cancellation and non-acceptance are rare. Ciena writes down its inventory for estimated obsolescence or unmarketable inventory by an amount equal to the difference between the cost of inventory and the estimated net realizable value based on assumptions about future demand, which are affected by changes in Ciena’s strategic direction, discontinuance of a product or introduction of newer versions of products, declines in the sales of or forecasted demand for certain products, and general market conditions. During the first three months of fiscal 2024, Ciena recorded a provision for inventory 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	3 Months Ended
	Jan. 27, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
PREPAID EXPENSES AND OTHER	PREPAID EXPENSES AND OTHER As of the dates indicated, prepaid expenses and other are comprised of the following (in thousands): January 27, October 28, Contract assets for unbilled accounts receivable, net $ 151,572 $ 150,312 Prepaid VAT and other taxes 87,965 96,724 Prepaid expenses 60,495 58,954 Product demonstration equipment, net 40,294 40,682 Capitalized contract acquisition costs 20,824 23,326 Other non-trade receivables 20,910 33,408 Derivative Assets 3,020 1,118 Deferred deployment expense 2,113 1,170 $ 387,193 $ 405,694 Depreciation of product demonstration equipment was $1.9 million during both the first three months of fiscal 2024 and fiscal 2023. For further discussion on contract assets and capitalized contract acquisition costs, see Note 3 above.

OTHER BALANCE SHEET DETAILS

OTHER BALANCE SHEET DETAILS	3 Months Ended
	Jan. 27, 2024
Balance Sheet Related Disclosures [Abstract]
OTHER BALANCE SHEET DETAILS	OTHER BALANCE SHEET DETAILS As of the dates indicated, accrued liabilities and other short-term obligations are comprised of the following (in thousands): January 27, October 28, Compensation, payroll related tax and benefits $ 93,937 $ 159,530 Warranty 56,400 57,089 Vacation 29,700 29,503 Interest payable 8,856 4,514 Income taxes payable 8,153 16,341 Foreign currency forward contracts 6,184 14,509 Finance lease liabilities 4,169 3,953 Other 122,511 145,980 $ 329,910 $ 431,419 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 Three Months Ended January 28, 2023 $ 45,503 8,230 (5,190) $ 48,543 Three Months Ended January 27, 2024 $ 57,089 4,841 (5,530) $ 56,400 As of the dates indicated, deferred revenue is comprised of the following (in thousands): January 27, October 28, Products $ 24,415 $ 28,353 Services 218,855 200,107 Total deferred revenue 243,270 228,460 Less current portion (166,714) (154,419) Long-term deferred revenue $ 76,556 $ 74,041

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS	3 Months Ended
	Jan. 27, 2024
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 January 27, 2024 and October 28, 2023, Ciena had forward contracts to hedge its foreign exchange exposure in order to reduce variability in certain currencies for expenses principally related to research and development activities. The notional amount of these contracts was approximately $349.5 million and $367.3 million as of January 27, 2024 and October 28, 2023, respectively. These foreign exchange contracts have maturities of 24 months or less and have been designated as cash flow hedges. As of January 27, 2024 and October 28, 2023, Ciena had forward contracts designated as net investment hedges to minimize the effect of foreign exchange rate movements on its net investments in foreign operations. The notional amount of these contracts was approximately $48.1 million and $48.0 million as of January 27, 2024 and October 28, 2023, respectively. These foreign exchange contracts have maturities of 24 months or less and have been designated as net investment hedges. As of January 27, 2024 and October 28, 2023, Ciena had forward contracts in place 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 $190.8 million and $226.3 million as of January 27, 2024 and October 28, 2023, 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 interest on its term loan borrowings (see Note 13 below) and has hedged such risk by entering into floating-to-fixed interest rate swap arrangements. In April 2022, Ciena entered into forward starting interest rate swaps to fix the Secured Overnight Financing Rate (“SOFR”) for the first $350.0 million of its floating rate debt at 2.968% from September 2023 through September 2025 (“2025 interest rate swaps”) . The total notional amount of the 2025 interest swaps was $350.0 million as of January 27, 2024. In January 2023, Ciena entered into interest rate swaps to fix SOFR for an additional $350.0 million of its floating rate debt at 3.47% through January 2028 (“2028 interest rate swaps”) . The total notional amount of these interest rate swaps in effect as of January 27, 2024 was $350.0 million. In December 2023, Ciena entered into forward starting interest rate swaps to fix SOFR for an additional $350.0 million of its floating rate debt at 3.287% from September 2025 through December 2028 (“2028 forward starting interest rate swaps”). The total notional amount of the 2028 forward starting interest rate swaps effective September 2025 was $350.0 million as of January 27, 2024. Ciena expects the variable rate payments to be received under the terms of these interest rate swaps to offset exactly the forecasted variable rate payments on the equivalent notional amount of the 2030 New Term Loan (as defined in Note 13 below). 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 5 and Note 8 above.

SHORT-TERM AND LONG-TERM DEBT

SHORT-TERM AND LONG-TERM DEBT	3 Months Ended
	Jan. 27, 2024
Debt Disclosure [Abstract]
SHORT-TERM AND LONG-TERM DEBT	SHORT-TERM AND LONG-TERM DEBT Outstanding Term Loan Payable 2030 New Term Loan On October 24, 2023, Ciena entered into an Incremental Amendment Agreement to its Credit Agreement to which Ciena incurred a new tranche of senior secured term loans in an aggregate principal amount of $1.2 billion maturing on October 24, 2030 (the “2030 New Term Loan”) and a new senior secured revolving credit facility of $300.0 million (the “Revolving Credit Facility”). The 2030 New Term Loan requires Ciena to make installment payments of $2.9 million quarterly, or $11.7 million annually, with the remaining balance payable at maturity. The net carrying value of the 2030 New Term Loan was comprised of the following as of the date indicated (in thousands): January 27, 2024 October 28, 2023 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2030 New Term Loan $ 1,170,000 $ (4,934) $ (6,157) $ 1,158,909 $ 1,159,371 Deferred debt issuance costs that were deducted from the carrying amount of the 2030 New Term Loan totaled $6.2 million as of January 27, 2024 and $5.5 million at October 28, 2023. 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 2030 New Term Loan. The amortization of deferred debt issuance costs for the 2030 New Term Loan is included in interest expense and was approximately $0.2 million during the first three months of fiscal 2024. As of January 27, 2024, the estimated fair value of the 2030 New Term Loan was $1.2 billion. The 2030 New Term Loan is categorized as Level 2 in the fair value hierarchy. Ciena estimated the fair value of its 2030 New Term Loan using a market approach based on observable inputs, such as current market transactions involving comparable securities. Refinanced Term Loans The proceeds of the 2030 New Term Loan, net of original issuance discount, was used to repay in full $1.2 billion of outstanding principal of the 2025 Term Loan (as defined below) and the 2030 Term Loan (as defined below), together the Refinanced Term Loans, including accrued interest. 2025 Term Loan On January 19, 2023, pursuant to the Incremental Agreement (as defined below) to the Credit Agreement, the Credit Agreement was amended to replace LIBOR with SOFR for Ciena’s senior secured term loan maturing on September 28, 2025 (the “2025 Term Loan”) in response to pending impact of FASB Accounting Standards Codification 848, Reference Rate Reform. Deferred debt issuance costs are amortized using the straight-line method, which approximates the effect of the effective interest rate method, through the maturity of the 2025 Term Loan. The amortization of deferred debt issuance costs for the 2025 Term Loan is included in interest expense, and was $0.2 million for the first three months of fiscal 2023. 2030 Term Loan On January 19, 2023, Ciena entered into an Incremental Joinder and Amendment Agreement (the “Incremental Agreement”) to its Credit Agreement, dated July 15, 2014, as amended, by and among Ciena, the lenders party thereto and Bank of America, N.A., as administrative agent, pursuant to which Ciena incurred a new tranche of senior secured term loans in an aggregate principal amount of $500.0 million and maturing on January 19, 2030 (the “2030 Term Loan”). Net of original issue discount and debt issuance costs, the $492.5 million in proceeds from the 2030 Term Loan were used for general corporate purposes. Deferred debt issuance costs are amortized using the straight-line method, which approximates the effect of the effective interest rate method, through the maturity of the 2030 Term Loan. The amortization of deferred debt issuance costs for the 2030 Term Loan is included in interest expense, and was nominal for the first three months of fiscal 2023. Outstanding Senior Notes Payable 2030 Notes On January 18, 2022, Ciena entered into an indenture among Ciena, as issuer, certain domestic subsidiaries of Ciena, as guarantors, and U.S. Bank National Association, as trustee, pursuant to which Ciena issued $400.0 million in aggregate principal amount of 4.00% fixed-rate senior notes due 2030 (the “2030 Notes”). The net carrying value of the 2030 Notes was comprised of the following as of the dates indicated (in thousands): January 27, 2024 October 28, 2023 Principal Balance Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2030 Notes $ 400,000 $ (4,091) $ 395,909 $ 395,735 Deferred debt issuance costs that were deducted from the carrying amount of the 2030 Notes totaled $4.1 million as of January 27, 2024 and $4.3 million as of October 28, 2023. 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 2030 Notes. The amortization of deferred debt issuance costs for the 2030 Notes is included in interest expense, and was approximately $0.2 million during both the first three months of fiscal 2024 and fiscal 2023 . As of January 27, 2024, the estimated fair value of the 2030 Notes was $363.5 million. The 2030 Notes are categorized as Level 2 in the fair value hierarchy. Ciena estimated the fair value of its 2030 Notes using a market approach based on observable inputs, such as current market transactions involving comparable securities.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME	3 Months Ended
	Jan. 27, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME	ACCUMULATED OTHER COMPREHENSIVE INCOME The following table summarizes the changes in accumulated balances of other comprehensive income (“AOCI”), net of tax, for the three months ended January 27, 2024 (in thousands): Unrealized Gain (Loss) on Available-for-sale Securities Foreign Currency Forward Contracts Interest Rate Swaps Cumulative Total Balance at October 28, 2023 $ (372) $ (8,156) $ 18,962 $ (48,201) $ (37,767) Other comprehensive gain (loss) before reclassifications 895 6,448 (5,592) 14,323 16,074 Amounts reclassified from AOCI — 708 (3,882) — (3,174) Balance at January 27, 2024 $ 523 $ (1,000) $ 9,488 $ (33,878) $ (24,867) The following table summarizes the changes in AOCI, net of tax, for the three months ended January 28, 2023 (in thousands): Unrealized Gain (Loss) on Available-for-sale Securities Foreign Currency Forward Contracts Interest Rate Swaps Cumulative Total Balance at October 29, 2022 $ (2,965) $ (10,197) $ 9,397 $ (42,880) $ (46,645) Other comprehensive gain (loss) before reclassifications 1,050 7,630 (4,226) 15,979 20,433 Amounts reclassified from AOCI — (2,288) (799) — (3,087) Balance at January 28, 2023 $ (1,915) $ (4,855) $ 4,372 $ (26,901) $ (29,299) All amounts reclassified from AOCI, related to settlement (gains) losses on foreign currency forward contracts designated as cash flow hedges, impacted research and development expense on the Condensed Consolidated Statements of Operations. All amounts reclassified from AOCI, related to settlement (gains) losses on interest rate swaps designated as cash flow hedges, impacted interest and other income, net, on the Condensed Consolidated Statements of Operations.

EARNINGS_PER SHARE CALCULATION

EARNINGS PER SHARE CALCULATION	3 Months Ended
	Jan. 27, 2024
Earnings Per Share [Abstract]
EARNINGS PER SHARE CALCULATION	EARNINGS PER SHARE CALCULATION 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 that 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. The following table presents the calculation of Basic and Diluted EPS for the periods indicated (in thousands, except per share amounts): Quarter Ended January 27, January 28, 2024 2023 Net income $ 49,547 $ 76,241 Basic weighted average shares outstanding 145,291 149,081 Effect of dilutive potential common shares 557 470 Diluted weighted average shares 145,848 149,551 Basic EPS $ 0.34 $ 0.51 Diluted EPS $ 0.34 $ 0.51 Antidilutive employee share-based awards, excluded 2,491 2,768

STOCKHOLDERS_ EQUITY

STOCKHOLDERS’ EQUITY	3 Months Ended
	Jan. 27, 2024
Equity [Abstract]
STOCKHOLDERS’ EQUITY	STOCKHOLDERS’ EQUITY Stock Repurchase Program On December 9, 2021, Ciena announced that its Board of Directors authorized a program to repurchase up to $1.0 billion of its common stock. During the first three months of fiscal 2024, Ciena repurchased an additional 0.7 million shares of its common stock for an aggregate purchase price of $32.0 million at an average price of $46.30 per share. As of January 27, 2024, Ciena (i) has repurchased 14.8 million shares for an aggregate purchase price of $782.0 million at an average price of $52.85 per share and (ii) has an aggregate of $218.0 million authorized and remaining under its stock repurchase program. 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 its common stock to satisfy employee tax withholding obligations due on vesting of stock unit awards. The related purchase price of $10.1 million for the shares of Ciena’s stock repurchased during the first three months of fiscal 2024 is reflected as a reduction to stockholders’ equity. Ciena is required to allocate the purchase price of the repurchased shares as a reduction of common stock and additional paid-in capital.

SHARE-BASED COMPENSATION EXPENS

SHARE-BASED COMPENSATION EXPENSE	3 Months Ended
	Jan. 27, 2024
Share-Based Payment Arrangement [Abstract]
SHARE-BASED COMPENSATION EXPENSE	SHARE-BASED COMPENSATION EXPENSE The following table summarizes share-based compensation expense for the periods indicated (in thousands): Quarter Ended January 27, January 28, 2024 2023 Products $ 1,318 $ 1,051 Services 3,020 2,297 Share-based compensation expense included in cost of goods sold 4,338 3,348 Research and development 12,880 9,234 Selling and marketing 10,305 8,424 General and administrative 10,079 9,468 Share-based compensation expense included in operating expense 33,264 27,126 Share-based compensation expense capitalized in inventory, net 225 38 Total share-based compensation expense $ 37,827 $ 30,512 As of January 27, 2024, total unrecognized share-based compensation expense was approximately $333.9 million , which relates to unvested stock unit awards and is expected to be recognized over a weighted-average period of 1.56 years.

SEGMENTS AND ENTITY-WIDE DISCLO

SEGMENTS AND ENTITY-WIDE DISCLOSURES	3 Months Ended
	Jan. 27, 2024
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, right-of-use (“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 January 27, 2024, equipment, building, furniture and fixtures, net, totaled $280.4 million, and operating ROU assets totaled $35.7 million both of which support asset groups within Ciena’s four operating segments and unallocated selling and general and administrative activities. As of January 27, 2024, finite-lived intangible assets, goodwill, and maintenance spares are assigned to asset groups within the following segments (in thousands): January 27, 2024 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Other intangible assets, net $ 181,155 — 14,527 — $ 195,682 Goodwill $ 199,844 156,191 89,049 — $ 445,084 Maintenance spares, net $ — — — 56,266 $ 56,266 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; significant asset impairments and restructuring costs; amortization of intangible assets; acquisition and integration costs; interest and other income, net; interest expense; and provision for income taxes. The table below sets forth Ciena’s segment profit (loss) and the reconciliation to net income for the periods indicated (in thousands): Quarter Ended January 27, January 28, 2024 2023 Segment profit (loss): Networking Platforms $ 183,775 $ 202,147 Platform Software and Services 58,004 45,650 Blue Planet Automation Software and Services (7,069) (11,059) Global Services 44,983 37,478 Total segment profit 279,693 274,216 Less: Non-performance operating expenses Selling and marketing 128,158 123,807 General and administrative 54,683 50,896 Significant asset impairments and restructuring costs 4,971 4,298 Amortization of intangible assets 7,252 7,441 Acquisition and integration costs — 2,558 Add: Other non-performance financial items Interest and other income, net 10,650 31,973 Interest expense (23,776) (15,870) Less: Provision for income taxes 21,956 25,078 Net income $ 49,547 $ 76,241 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 United States and Canada are reflected as “Other International.” For the periods indicated, Ciena’s geographic distribution of equipment, building, furniture and fixtures, net, and operating ROU assets was as follows (in thousands): January 27, October 28, Canada $ 230,712 $ 229,707 United States 47,231 46,933 Other International 38,093 38,647 Total $ 316,036 $ 315,287

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Jan. 27, 2024
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES 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. Purchase Order Obligations Ciena has certain advanced orders for supply of certain long lead time components. As of January 27, 2024, Ciena had $1.9 billion in outstanding purchase order commitments to contract manufacturers and component suppliers for inventory. In certain instances, Ciena is permitted to cancel, reschedule or adjust these orders. Consequently, only a portion of this amount relates to firm, non-cancelable and unconditional obligations.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	3 Months Ended
	Jan. 27, 2024
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS Stock Repurchase Program

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Pay vs Performance Disclosure
Net income	$ 49,547	$ 76,241

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Jan. 27, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Joseph Cumello [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	The following table describes, for the quarter ended January 27, 2024 , each trading arrangement for the sale or purchase of our securities adopted, terminated or for which the amount, pricing or timing provisions were modified by our directors and officers ( as defined in Rule 16a-1(f) of the Exchange Act) that is either (1) a contract, instruction or written plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) (a “Rule 10b5-1 trading arrangement”) or (2) a “non-Rule 10b5-1 trading arrangement” (as defined in Item 408(c) of Regulation S-K): Name Action Taken (Date of Action) Type of Trading Arrangement Nature of Trading Arrangement Duration of Trading Arrangement Aggregate Number of Securities to be Purchased or Sold Joseph Cumello (Senior Vice President and General Manager of Blue Planet) Adoption (January 8, 2024) Rule 10b5-1 trading arrangement Sales Until December 27, 2024, or such earlier date upon which all transactions are completed or expire without execution * • The aggregate number of shares of common stock to be sold pursuant to Mr. Cumello’s arrangement is up to (i) 11,599 shares of common stock plus (ii) 100% of the net after-tax shares of common stock to be received as a result of the March 20, 2024 vesting of 2,805 restricted stock units. The actual number of net after-tax shares to be received will vary based on the market price of our common stock at the time of settlement.
Name	Joseph Cumello
Title	Senior Vice President and General Manager of Blue Planet
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	January 8, 2024
Arrangement Duration	354 days
Joseph Cumello, Trading Arrangement, Common Stock [Member] | Joseph Cumello [Member]
Trading Arrangements, by Individual
Aggregate Available	11,599
Joseph Cumello, Trading Arrangement, Restricted Stock Units [Member] | Joseph Cumello [Member]
Trading Arrangements, by Individual
Aggregate Available	2,805

SIGNIFICANT ACCOUNTING POLICI_2

SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Jan. 27, 2024
Accounting Policies [Abstract]
Newly Issued Accounting Standards - Effective and Not Yet Effective	Newly Issued Accounting Standards - Effective In October 2021, the FASB issued ASU No. 2021-08 (“ASU 2021-08”), Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers to improve the accounting for acquired revenue contracts with customers in a business combination to address recognition of an acquired contract liability and payment terms and their effect on subsequent revenue recognized by the acquirer. ASU 2021-08 was effective for Ciena beginning in the first quarter of fiscal 2024 without any material impact on its consolidated financial position, results of operations and related disclosures. Newly Issued Accounting Standards - Not Yet Effective In November 2023, the FASB issued ASU No. 2023-07 (“ASU 2023-07”), Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023 on a retrospective basis. Early adoption is permitted. Ciena is currently evaluating the impact of this accounting standard update on its consolidated financial statements and related disclosures. In December 2023, the FASB issued ASU No. 2023-09 (“ASU 2023-09”), Income Taxes (Topic 740): Improvement to Income Tax Disclosures to enhance the transparency and decision usefulness of income tax disclosures. ASU 2023-09 is effective for annual periods beginning after December 15, 2024; however, early adoption is permitted. ASU 2023-09 allows for

REVENUE (Tables)

REVENUE (Tables)	3 Months Ended
	Jan. 27, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The tables below set forth Ciena’s disaggregated revenue for the respective periods (in thousands): Quarter Ended January 27, 2024 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Optical Networking $ 695,849 $ — $ — $ — $ 695,849 Routing and Switching 111,387 — — — 111,387 Platform Software and Services — 89,745 — — 89,745 Blue Planet Automation Software and Services — — 13,942 — 13,942 Maintenance Support and Training — — — 74,115 74,115 Installation and Deployment — — — 42,723 42,723 Consulting and Network Design — — — 9,948 9,948 Total revenue by product line $ 807,236 $ 89,745 $ 13,942 $ 126,786 $ 1,037,709 Timing of revenue recognition: Products and services at a point in time $ 807,236 $ 27,694 $ 1,069 $ 9,638 $ 845,637 Services transferred over time — 62,051 12,873 117,148 192,072 Total revenue by timing of revenue recognition $ 807,236 $ 89,745 $ 13,942 $ 126,786 $ 1,037,709 Quarter Ended January 28, 2023 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Optical Networking $ 735,634 $ — $ — $ — $ 735,634 Routing and Switching 119,505 — — — 119,505 Platform Software and Services — 73,445 — — 73,445 Blue Planet Automation Software and Services — — 15,405 — 15,405 Maintenance Support and Training — — — 67,891 67,891 Installation and Deployment — — — 34,575 34,575 Consulting and Network Design — — — 10,066 10,066 Total revenue by product line $ 855,139 $ 73,445 $ 15,405 $ 112,532 $ 1,056,521 Timing of revenue recognition: Products and services at a point in time $ 855,139 $ 18,864 $ 3,982 $ 9,255 $ 887,240 Services transferred over time — 54,581 11,423 103,277 169,281 Total revenue by timing of revenue recognition $ 855,139 $ 73,445 $ 15,405 $ 112,532 $ 1,056,521 For the periods below, Ciena’s geographic distribution of revenue was as follows (in thousands): Quarter Ended January 27, January 28, 2024 2023 Geographic distribution: Americas $ 718,198 $ 765,096 EMEA 207,413 152,804 APAC 112,098 138,621 Total revenue by geographic distribution $ 1,037,709 $ 1,056,521 For the periods below, the only customers that accounted for at least 10% of Ciena’s revenue were as follows (in thousands): Quarter Ended January 27, January 28, 2024 2023 Cloud provider A $ 166,008 n/a Cloud provider B 109,098 121,327 AT&T n/a 149,981 Total $ 275,106 $ 271,308 _____________________________________ n/a Denotes revenue representing less than 10% of total revenue for the period
Schedule of Contract Balances	The following table provides information about receivables, contract assets, and contract liabilities (deferred revenue) from contracts with customers (in thousands): Balance at January 27, 2024 Balance at October 28, 2023 Accounts receivable, net $ 865,239 $ 1,003,876 Contract assets for unbilled accounts receivable, net $ 151,572 $ 150,312 Deferred revenue $ 243,270 $ 228,460 As of the dates indicated, deferred revenue is comprised of the following (in thousands): January 27, October 28, Products $ 24,415 $ 28,353 Services 218,855 200,107 Total deferred revenue 243,270 228,460 Less current portion (166,714) (154,419) Long-term deferred revenue $ 76,556 $ 74,041

SIGNIFICANT ASSET IMPAIRMENT _2

SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS (Tables)	3 Months Ended
	Jan. 27, 2024
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 the Condensed Consolidated Balance Sheets, for the three months ended January 27, 2024 (in thousands): Workforce Other restructuring activities Total Balance at October 28, 2023 $ 1,913 $ — $ 1,913 Charges 2,861 (1) 2,110 (2) 4,971 Cash payments (4,058) (2,110) (6,168) Balance at January 27, 2024 $ 716 $ — $ 716 Current restructuring liabilities $ 716 $ — $ 716 (1) Reflects employee costs associated with workforce reductions during the three months ended January 27, 2024 as part of a business optimization strategy to improve gross margin, constrain operating expense, and redesign certain business processes. (2) Primarily represents costs related to restructured real estate facilities and the redesign of certain business processes associated with Ciena’s supply chain and distribution structure reorganization. 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 the Condensed Consolidated Balance Sheets for the three months ended January 28, 2023 (in thousands): Workforce Other restructuring activities Total Balance at October 29, 2022 $ 1,215 $ 4,620 $ 5,835 Charges 704 (1) 3,594 (2) 4,298 Cash payments (1,498) (8,214) (9,712) Balance at January 28, 2023 $ 421 $ — $ 421 Current restructuring liabilities $ 421 $ — $ 421 (1) Reflects employee costs associated with workforce reductions during the three months ended January 28, 2023 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 associated with Ciena’s supply chain and distribution structure reorganization and costs related to restructured real estate facilities.

INTEREST AND OTHER INCOME, NET

INTEREST AND OTHER INCOME, NET (Tables)	3 Months Ended
	Jan. 27, 2024
Other Income and Expenses [Abstract]
Schedule of Interest and Other Income, Net	The components of interest and other income, net, are as follows for the periods indicated (in thousands): Quarter Ended January 27, January 28, 2024 2023 Interest income $ 15,177 $ 7,121 Gains (losses) on non-hedge designated foreign currency forward contracts 3,112 (1,769) Foreign currency exchange losses (9,192) (1,889) Gain on cost method equity investments, net — 26,455 Other 1,553 2,055 Interest and other income, net $ 10,650 $ 31,973

CASH EQUIVALENT, SHORT-TERM A_2

CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS (Tables)	3 Months Ended
	Jan. 27, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-Sale Securities Reconciliation	As of the dates indicated, investments are comprised of the following (in thousands): January 27, 2024 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations $ 141,947 $ 759 $ (82) $ 142,624 Corporate debt securities 57,604 40 (25) 57,619 Time deposits 144,106 20 — 144,126 $ 343,657 $ 819 $ (107) $ 344,369 Included in cash equivalents $ 133,829 $ — $ — $ 133,829 Included in short-term investments 106,603 143 (68) 106,678 Included in long-term investments 103,225 676 (39) 103,862 $ 343,657 $ 819 $ (107) $ 344,369 October 28, 2023 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations $ 170,260 $ 28 $ (379) $ 169,909 Corporate debt securities 59,683 1 (115) 59,569 Time deposits 138,830 4 (5) 138,829 $ 368,773 $ 33 $ (499) $ 368,307 Included in cash equivalents $ 129,276 $ — $ — $ 129,276 Included in short-term investments 105,042 4 (293) 104,753 Included in long-term investments 134,455 29 (206) 134,278 $ 368,773 $ 33 $ (499) $ 368,307
Schedule of Legal Maturities of Debt Investments	The following table summarizes the final legal maturities of debt investments as of January 27, 2024 (in thousands): Amortized Estimated Less than one year $ 240,433 $ 240,507 Due in 1-2 years 103,224 103,862 $ 343,657 $ 344,369

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended
	Jan. 27, 2024
Fair Value Disclosures [Abstract]
Schedule of the Fair Value of Assets and Liabilities Recorded on a Recurring Basis	As of the dates indicated, the following tables summarize the assets and liabilities that are recorded at fair value on a recurring basis (in thousands): January 27, 2024 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 895,909 $ — $ — $ 895,909 Bond mutual fund 156,300 — — 156,300 Time deposits 144,126 — — 144,126 Deferred compensation plan assets 14,614 — — 14,614 U.S. government obligations — 142,624 — 142,624 Corporate debt securities — 57,619 — 57,619 Foreign currency forward contracts — 3,020 — 3,020 Interest rate swaps — 12,501 — 12,501 Total assets measured at fair value $ 1,210,949 $ 215,764 $ — $ 1,426,713 Liabilities: Foreign currency forward contracts $ — $ 6,184 $ — $ 6,184 Total liabilities measured at fair value $ — $ 6,184 $ — $ 6,184 October 28, 2023 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 661,101 $ — $ — $ 661,101 Bond mutual fund 104,171 — — 104,171 Time deposits 138,829 — — 138,829 Deferred compensation plan assets 11,456 — — 11,456 U.S. government obligations — 169,909 — 169,909 Corporate debt securities — 59,569 — 59,569 Foreign currency forward contracts — 1,119 — 1,119 Interest rate swaps — 24,953 — 24,953 Total assets measured at fair value $ 915,557 $ 255,550 $ — $ 1,171,107 Liabilities: Foreign currency forward contracts $ — $ 14,509 $ — $ 14,509 Total liabilities measured at fair value $ — $ 14,509 $ — $ 14,509
Schedule of Assets and Liabilities as Presented on Ciena's Condensed Consolidated Balance Sheets	As of the dates indicated, the assets and liabilities above are presented on Ciena’s Condensed Consolidated Balance Sheets as follows (in thousands): January 27, 2024 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 1,183,109 $ 2,929 $ — $ 1,186,038 Short-term investments 13,226 93,452 — 106,678 Prepaid expenses and other — 3,020 — 3,020 Long-term investments — 103,862 — 103,862 Other long-term assets 14,614 12,501 — 27,115 Total assets measured at fair value $ 1,210,949 $ 215,764 $ — $ 1,426,713 Liabilities: Accrued liabilities and other short-term obligations $ — $ 6,184 $ — $ 6,184 Total liabilities measured at fair value $ — $ 6,184 $ — $ 6,184 October 28, 2023 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 891,788 $ 2,760 $ — $ 894,548 Short-term investments 12,313 92,440 — 104,753 Prepaid expenses and other — 1,119 — 1,119 Long-term investments — 134,278 — 134,278 Other long-term assets 11,456 24,953 — 36,409 Total assets measured at fair value $ 915,557 $ 255,550 $ — $ 1,171,107 Liabilities: Accrued liabilities and other short-term obligations $ — $ 14,509 $ — $ 14,509 Total liabilities measured at fair value $ — $ 14,509 $ — $ 14,509

INVENTORIES (Tables)

INVENTORIES (Tables)	3 Months Ended
	Jan. 27, 2024
Inventory Disclosure [Abstract]
Schedule of Inventories	As of the dates indicated, inventories are comprised of the following (in thousands): January 27, October 28, Raw materials $ 571,666 $ 664,797 Work-in-process 60,644 55,242 Finished goods 369,771 314,168 Deferred cost of goods sold 36,824 66,634 Gross inventories 1,038,905 1,100,841 Reserve for inventory excess and obsolescence (54,019) (50,003) Inventories, net $ 984,886 $ 1,050,838

PREPAID EXPENSES AND OTHER (Tab

PREPAID EXPENSES AND OTHER (Tables)	3 Months Ended
	Jan. 27, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Prepaid Expenses and Other	As of the dates indicated, prepaid expenses and other are comprised of the following (in thousands): January 27, October 28, Contract assets for unbilled accounts receivable, net $ 151,572 $ 150,312 Prepaid VAT and other taxes 87,965 96,724 Prepaid expenses 60,495 58,954 Product demonstration equipment, net 40,294 40,682 Capitalized contract acquisition costs 20,824 23,326 Other non-trade receivables 20,910 33,408 Derivative Assets 3,020 1,118 Deferred deployment expense 2,113 1,170 $ 387,193 $ 405,694

OTHER BALANCE SHEET DETAILS (Ta

OTHER BALANCE SHEET DETAILS (Tables)	3 Months Ended
	Jan. 27, 2024
Balance Sheet Related Disclosures [Abstract]
Schedule of Accrued Liabilities	As of the dates indicated, accrued liabilities and other short-term obligations are comprised of the following (in thousands): January 27, October 28, Compensation, payroll related tax and benefits $ 93,937 $ 159,530 Warranty 56,400 57,089 Vacation 29,700 29,503 Interest payable 8,856 4,514 Income taxes payable 8,153 16,341 Foreign currency forward contracts 6,184 14,509 Finance lease liabilities 4,169 3,953 Other 122,511 145,980 $ 329,910 $ 431,419
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 Three Months Ended January 28, 2023 $ 45,503 8,230 (5,190) $ 48,543 Three Months Ended January 27, 2024 $ 57,089 4,841 (5,530) $ 56,400
Schedule of Contract Balances	The following table provides information about receivables, contract assets, and contract liabilities (deferred revenue) from contracts with customers (in thousands): Balance at January 27, 2024 Balance at October 28, 2023 Accounts receivable, net $ 865,239 $ 1,003,876 Contract assets for unbilled accounts receivable, net $ 151,572 $ 150,312 Deferred revenue $ 243,270 $ 228,460 As of the dates indicated, deferred revenue is comprised of the following (in thousands): January 27, October 28, Products $ 24,415 $ 28,353 Services 218,855 200,107 Total deferred revenue 243,270 228,460 Less current portion (166,714) (154,419) Long-term deferred revenue $ 76,556 $ 74,041

SHORT-TERM AND LONG-TERM DEBT (

SHORT-TERM AND LONG-TERM DEBT (Tables)	3 Months Ended
	Jan. 27, 2024
Debt Disclosure [Abstract]
Schedule of Carrying Values and Estimated Fair Values of Convertible Notes	The net carrying value of the 2030 New Term Loan was comprised of the following as of the date indicated (in thousands): January 27, 2024 October 28, 2023 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2030 New Term Loan $ 1,170,000 $ (4,934) $ (6,157) $ 1,158,909 $ 1,159,371 The net carrying value of the 2030 Notes was comprised of the following as of the dates indicated (in thousands): January 27, 2024 October 28, 2023 Principal Balance Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2030 Notes $ 400,000 $ (4,091) $ 395,909 $ 395,735

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)	3 Months Ended
	Jan. 27, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income	The following table summarizes the changes in accumulated balances of other comprehensive income (“AOCI”), net of tax, for the three months ended January 27, 2024 (in thousands): Unrealized Gain (Loss) on Available-for-sale Securities Foreign Currency Forward Contracts Interest Rate Swaps Cumulative Total Balance at October 28, 2023 $ (372) $ (8,156) $ 18,962 $ (48,201) $ (37,767) Other comprehensive gain (loss) before reclassifications 895 6,448 (5,592) 14,323 16,074 Amounts reclassified from AOCI — 708 (3,882) — (3,174) Balance at January 27, 2024 $ 523 $ (1,000) $ 9,488 $ (33,878) $ (24,867) The following table summarizes the changes in AOCI, net of tax, for the three months ended January 28, 2023 (in thousands): Unrealized Gain (Loss) on Available-for-sale Securities Foreign Currency Forward Contracts Interest Rate Swaps Cumulative Total Balance at October 29, 2022 $ (2,965) $ (10,197) $ 9,397 $ (42,880) $ (46,645) Other comprehensive gain (loss) before reclassifications 1,050 7,630 (4,226) 15,979 20,433 Amounts reclassified from AOCI — (2,288) (799) — (3,087) Balance at January 28, 2023 $ (1,915) $ (4,855) $ 4,372 $ (26,901) $ (29,299)

EARNINGS_PER SHARE CALCULATION

EARNINGS PER SHARE CALCULATION (Tables)	3 Months Ended
	Jan. 27, 2024
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 EPS for the periods indicated (in thousands, except per share amounts): Quarter Ended January 27, January 28, 2024 2023 Net income $ 49,547 $ 76,241 Basic weighted average shares outstanding 145,291 149,081 Effect of dilutive potential common shares 557 470 Diluted weighted average shares 145,848 149,551 Basic EPS $ 0.34 $ 0.51 Diluted EPS $ 0.34 $ 0.51 Antidilutive employee share-based awards, excluded 2,491 2,768

SHARE-BASED COMPENSATION EXPE_2

SHARE-BASED COMPENSATION EXPENSE (Tables)	3 Months Ended
	Jan. 27, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Share-based Compensation Expense	The following table summarizes share-based compensation expense for the periods indicated (in thousands): Quarter Ended January 27, January 28, 2024 2023 Products $ 1,318 $ 1,051 Services 3,020 2,297 Share-based compensation expense included in cost of goods sold 4,338 3,348 Research and development 12,880 9,234 Selling and marketing 10,305 8,424 General and administrative 10,079 9,468 Share-based compensation expense included in operating expense 33,264 27,126 Share-based compensation expense capitalized in inventory, net 225 38 Total share-based compensation expense $ 37,827 $ 30,512

SEGMENTS AND ENTITY-WIDE DISC_2

SEGMENTS AND ENTITY-WIDE DISCLOSURES (Tables)	3 Months Ended
	Jan. 27, 2024
Segment Reporting [Abstract]
Schedule of Reconciliation of Assets From Segment to Consolidated	As of January 27, 2024, finite-lived intangible assets, goodwill, and maintenance spares are assigned to asset groups within the following segments (in thousands): January 27, 2024 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Other intangible assets, net $ 181,155 — 14,527 — $ 195,682 Goodwill $ 199,844 156,191 89,049 — $ 445,084 Maintenance spares, net $ — — — 56,266 $ 56,266
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 net income for the periods indicated (in thousands): Quarter Ended January 27, January 28, 2024 2023 Segment profit (loss): Networking Platforms $ 183,775 $ 202,147 Platform Software and Services 58,004 45,650 Blue Planet Automation Software and Services (7,069) (11,059) Global Services 44,983 37,478 Total segment profit 279,693 274,216 Less: Non-performance operating expenses Selling and marketing 128,158 123,807 General and administrative 54,683 50,896 Significant asset impairments and restructuring costs 4,971 4,298 Amortization of intangible assets 7,252 7,441 Acquisition and integration costs — 2,558 Add: Other non-performance financial items Interest and other income, net 10,650 31,973 Interest expense (23,776) (15,870) Less: Provision for income taxes 21,956 25,078 Net income $ 49,547 $ 76,241
Schedule of Ciena's Geographic Distribution of Revenue and Long-Lived Assets	For the periods indicated, Ciena’s geographic distribution of equipment, building, furniture and fixtures, net, and operating ROU assets was as follows (in thousands): January 27, October 28, Canada $ 230,712 $ 229,707 United States 47,231 46,933 Other International 38,093 38,647 Total $ 316,036 $ 315,287

REVENUE - Disaggregation of Rev

REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,037,709	$ 1,056,521
Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	845,637	887,240
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	192,072	169,281
Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	807,236	855,139
Networking Platforms | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	807,236	855,139
Networking Platforms | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	89,745	73,445
Platform Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	27,694	18,864
Platform Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	62,051	54,581
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	13,942	15,405
Blue Planet Automation Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	1,069	3,982
Blue Planet Automation Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	12,873	11,423
Global Services
Disaggregation of Revenue [Line Items]
Total revenue	126,786	112,532
Global Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	9,638	9,255
Global Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	117,148	103,277
Optical Networking
Disaggregation of Revenue [Line Items]
Total revenue	695,849	735,634
Optical Networking | Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	695,849	735,634
Optical Networking | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Optical Networking | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Optical Networking | Global Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	111,387	119,505
Routing and Switching | Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	111,387	119,505
Routing and Switching | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Routing and Switching | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Routing and Switching | Global Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	89,745	73,445
Platform Software and Services | Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	89,745	73,445
Platform Software and Services | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Global Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	13,942	15,405
Blue Planet Automation Software and Services | Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	13,942	15,405
Blue Planet Automation Software and Services | Global Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	74,115	67,891
Maintenance Support and Training | Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Maintenance Support and Training | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Maintenance Support and Training | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Maintenance Support and Training | Global Services
Disaggregation of Revenue [Line Items]
Total revenue	74,115	67,891
Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	42,723	34,575
Installation and Deployment | Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Installation and Deployment | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Installation and Deployment | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Installation and Deployment | Global Services
Disaggregation of Revenue [Line Items]
Total revenue	42,723	34,575
Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	9,948	10,066
Consulting and Network Design | Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Consulting and Network Design | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Consulting and Network Design | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Consulting and Network Design | Global Services
Disaggregation of Revenue [Line Items]
Total revenue	$ 9,948	$ 10,066

REVENUE - Geographical Distribu

REVENUE - Geographical Distribution of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,037,709	$ 1,056,521
Americas
Disaggregation of Revenue [Line Items]
Total revenue	718,198	765,096
EMEA
Disaggregation of Revenue [Line Items]
Total revenue	207,413	152,804
APAC
Disaggregation of Revenue [Line Items]
Total revenue	$ 112,098	$ 138,621

REVENUE - Narrative (Details)

REVENUE - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023	Oct. 28, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,037,709	$ 1,056,521
Revenue recognized that was previously deferred	70,600	67,900
Capitalized contract acquisition costs	27,800		$ 30,200
Amortization of capitalized contract acquisition costs	7,700	7,200
Remaining performance obligation	$ 1,700,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-28
Disaggregation of Revenue [Line Items]
Percentage of remaining performance obligation	83%
Period of remaining performance obligation	12 months
United States
Disaggregation of Revenue [Line Items]
Total revenue	$ 677,600	$ 693,600

REVENUE - Revenue by Major Cust

REVENUE - Revenue by Major Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Revenue, Major Customer [Line Items]
Total revenue	$ 1,037,709	$ 1,056,521
Cloud provider A | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue	166,008
Cloud provider B | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue	109,098	121,327
AT&T | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue		149,981
Total | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue	$ 275,106	$ 271,308

REVENUE - Contract Balances (De

REVENUE - Contract Balances (Details) - USD ($) $ in Thousands	Jan. 27, 2024	Oct. 28, 2023
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 865,239	$ 1,003,876
Contract assets for unbilled accounts receivable, net	151,572	150,312
Deferred revenue	$ 243,270	$ 228,460

SIGNIFICANT ASSET IMPAIRMENT _3

SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS - Schedule of Restructuring Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 1,913	$ 5,835
Charges	4,971	4,298
Cash payments	(6,168)	(9,712)
Balance at end of period	716	421
Current restructuring liabilities	716	421
Workforce reduction
Restructuring Reserve [Roll Forward]
Balance at beginning of period	1,913	1,215
Charges	2,861	704
Cash payments	(4,058)	(1,498)
Balance at end of period	716	421
Current restructuring liabilities	716	421
Other restructuring activities
Restructuring Reserve [Roll Forward]
Balance at beginning of period	0	4,620
Charges	2,110	3,594
Cash payments	(2,110)	(8,214)
Balance at end of period	0	0
Current restructuring liabilities	$ 0	$ 0

INTEREST AND OTHER INCOME, NE_2

INTEREST AND OTHER INCOME, NET (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Other Income and Expenses [Abstract]
Interest income	$ 15,177	$ 7,121
Gains (losses) on non-hedge designated foreign currency forward contracts	3,112	(1,769)
Foreign currency exchange losses	(9,192)	(1,889)
Gain on cost method equity investments, net	0	26,455
Other	1,553	2,055
Interest and other income, net	$ 10,650	$ 31,973

CASH EQUIVALENT, SHORT-TERM A_3

CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS - Schedule of Short-term and Long-term Investments (Details) - USD ($) $ in Thousands	Jan. 27, 2024	Oct. 28, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 343,657	$ 368,773
Gross Unrealized Gains	819	33
Gross Unrealized Losses	(107)	(499)
Estimated Fair Value	344,369	368,307
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	133,829	129,276
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	133,829	129,276
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	106,603	105,042
Gross Unrealized Gains	143	4
Gross Unrealized Losses	(68)	(293)
Estimated Fair Value	106,678	104,753
Included in long-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	103,225	134,455
Gross Unrealized Gains	676	29
Gross Unrealized Losses	(39)	(206)
Estimated Fair Value	103,862	134,278
U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	141,947	170,260
Gross Unrealized Gains	759	28
Gross Unrealized Losses	(82)	(379)
Estimated Fair Value	142,624	169,909
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	57,604	59,683
Gross Unrealized Gains	40	1
Gross Unrealized Losses	(25)	(115)
Estimated Fair Value	57,619	59,569
Time deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	144,106	138,830
Gross Unrealized Gains	20	4
Gross Unrealized Losses	0	(5)
Estimated Fair Value	$ 144,126	$ 138,829

CASH EQUIVALENT, SHORT-TERM A_4

CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS - Legal Maturities of Debt Investments (Details) - USD ($) $ in Thousands	Jan. 27, 2024	Oct. 28, 2023
Amortized Cost
Less than one year	$ 240,433
Due in 1-2 years	103,224
Amortized Cost	343,657	$ 368,773
Estimated Fair Value
Less than one year	240,507
Due in 1-2 years	103,862
Estimated Fair Value	$ 344,369	$ 368,307

FAIR VALUE MEASUREMENTS - Fair

FAIR VALUE MEASUREMENTS - Fair Value Measurements (Details) - USD ($) $ in Thousands	Jan. 27, 2024	Oct. 28, 2023
Assets:
Estimated Fair Value	$ 344,369	$ 368,307
Corporate debt securities
Assets:
Estimated Fair Value	57,619	59,569
Fair value, Measurements, Recurring
Assets:
Deferred compensation plan assets	14,614	11,456
Total assets measured at fair value	1,426,713	1,171,107
Liabilities:
Total liabilities measured at fair value	6,184	14,509
Fair value, Measurements, Recurring | Foreign Currency Forward Contracts
Assets:
Foreign currency forward contracts	3,020	1,119
Liabilities:
Derivative liability	6,184	14,509
Fair value, Measurements, Recurring | Interest rate swaps
Assets:
Foreign currency forward contracts	12,501	24,953
Fair value, Measurements, Recurring | Bond mutual fund
Assets:
Estimated Fair Value	156,300	104,171
Fair value, Measurements, Recurring | U.S. government obligations
Assets:
Estimated Fair Value	142,624	169,909
Fair value, Measurements, Recurring | Corporate debt securities
Assets:
Estimated Fair Value	57,619	59,569
Level 1 | Fair value, Measurements, Recurring
Assets:
Deferred compensation plan assets	14,614	11,456
Total assets measured at fair value	1,210,949	915,557
Liabilities:
Total liabilities measured at fair value	0	0
Level 1 | Fair value, Measurements, Recurring | Foreign Currency Forward Contracts
Assets:
Foreign currency forward contracts	0	0
Liabilities:
Derivative liability	0	0
Level 1 | Fair value, Measurements, Recurring | Interest rate swaps
Assets:
Foreign currency forward contracts	0	0
Level 1 | Fair value, Measurements, Recurring | Bond mutual fund
Assets:
Estimated Fair Value	156,300	104,171
Level 1 | Fair value, Measurements, Recurring | U.S. government obligations
Assets:
Estimated Fair Value	0	0
Level 1 | Fair value, Measurements, Recurring | Corporate debt securities
Assets:
Estimated Fair Value	0	0
Level 2 | Fair value, Measurements, Recurring
Assets:
Deferred compensation plan assets	0	0
Total assets measured at fair value	215,764	255,550
Liabilities:
Total liabilities measured at fair value	6,184	14,509
Level 2 | Fair value, Measurements, Recurring | Foreign Currency Forward Contracts
Assets:
Foreign currency forward contracts	3,020	1,119
Liabilities:
Derivative liability	6,184	14,509
Level 2 | Fair value, Measurements, Recurring | Interest rate swaps
Assets:
Foreign currency forward contracts	12,501	24,953
Level 2 | Fair value, Measurements, Recurring | Bond mutual fund
Assets:
Estimated Fair Value	0	0
Level 2 | Fair value, Measurements, Recurring | U.S. government obligations
Assets:
Estimated Fair Value	142,624	169,909
Level 2 | Fair value, Measurements, Recurring | Corporate debt securities
Assets:
Estimated Fair Value	57,619	59,569
Level 3 | Fair value, Measurements, Recurring
Assets:
Deferred compensation plan assets	0	0
Total assets measured at fair value	0	0
Liabilities:
Total liabilities measured at fair value	0	0
Level 3 | Fair value, Measurements, Recurring | Foreign Currency Forward Contracts
Assets:
Foreign currency forward contracts	0	0
Liabilities:
Derivative liability	0	0
Level 3 | Fair value, Measurements, Recurring | Interest rate swaps
Assets:
Foreign currency forward contracts	0	0
Level 3 | Fair value, Measurements, Recurring | Bond mutual fund
Assets:
Estimated Fair Value	0	0
Level 3 | Fair value, Measurements, Recurring | U.S. government obligations
Assets:
Estimated Fair Value	0	0
Level 3 | Fair value, Measurements, Recurring | Corporate debt securities
Assets:
Estimated Fair Value	0	0
Money market funds | Fair value, Measurements, Recurring
Assets:
Cash equivalents	895,909	661,101
Money market funds | Level 1 | Fair value, Measurements, Recurring
Assets:
Cash equivalents	895,909	661,101
Money market funds | Level 2 | Fair value, Measurements, Recurring
Assets:
Cash equivalents	0	0
Money market funds | Level 3 | Fair value, Measurements, Recurring
Assets:
Cash equivalents	0	0
Time deposits | Fair value, Measurements, Recurring
Assets:
Cash equivalents	144,126	138,829
Time deposits | Level 1 | Fair value, Measurements, Recurring
Assets:
Cash equivalents	144,126	138,829
Time deposits | Level 2 | Fair value, Measurements, Recurring
Assets:
Cash equivalents	0	0
Time deposits | Level 3 | Fair value, Measurements, Recurring
Assets:
Cash equivalents	$ 0	$ 0

FAIR VALUE MEASUREMENTS - Conde

FAIR VALUE MEASUREMENTS - Condensed Consolidated Balance Sheet (Details) - Fair value, Measurements, Recurring - USD ($) $ in Thousands	Jan. 27, 2024	Oct. 28, 2023
Assets:
Total assets measured at fair value	$ 1,426,713	$ 1,171,107
Liabilities:
Total liabilities measured at fair value	6,184	14,509
Level 1
Assets:
Total assets measured at fair value	1,210,949	915,557
Liabilities:
Total liabilities measured at fair value	0	0
Level 2
Assets:
Total assets measured at fair value	215,764	255,550
Liabilities:
Total liabilities measured at fair value	6,184	14,509
Level 3
Assets:
Total assets measured at fair value	0	0
Liabilities:
Total liabilities measured at fair value	0	0
Cash equivalents
Assets:
Cash equivalents	1,186,038	894,548
Cash equivalents | Level 1
Assets:
Cash equivalents	1,183,109	891,788
Cash equivalents | Level 2
Assets:
Cash equivalents	2,929	2,760
Cash equivalents | Level 3
Assets:
Cash equivalents	0	0
Short-term investments
Assets:
Short-term investments	106,678	104,753
Short-term investments | Level 1
Assets:
Short-term investments	13,226	12,313
Short-term investments | Level 2
Assets:
Short-term investments	93,452	92,440
Short-term investments | Level 3
Assets:
Short-term investments	0	0
Prepaid expenses and other
Assets:
Other assets	3,020	1,119
Prepaid expenses and other | Level 1
Assets:
Other assets	0	0
Prepaid expenses and other | Level 2
Assets:
Other assets	3,020	1,119
Prepaid expenses and other | Level 3
Assets:
Other assets	0	0
Long-term investments
Assets:
Long-term investments	103,862	134,278
Long-term investments | Level 1
Assets:
Long-term investments	0	0
Long-term investments | Level 2
Assets:
Long-term investments	103,862	134,278
Long-term investments | Level 3
Assets:
Long-term investments	0	0
Other long-term assets
Assets:
Other assets	27,115	36,409
Other long-term assets | Level 1
Assets:
Other assets	14,614	11,456
Other long-term assets | Level 2
Assets:
Other assets	12,501	24,953
Other long-term assets | Level 3
Assets:
Other assets	0	0
Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations	6,184	14,509
Accrued liabilities and other short-term obligations | Level 1
Liabilities:
Accrued liabilities and other short-term obligations	0	0
Accrued liabilities and other short-term obligations | Level 2
Liabilities:
Accrued liabilities and other short-term obligations	6,184	14,509
Accrued liabilities and other short-term obligations | Level 3
Liabilities:
Accrued liabilities and other short-term obligations	$ 0	$ 0

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023	Oct. 28, 2023
Inventory Disclosure [Abstract]
Raw materials	$ 571,666		$ 664,797
Work-in-process	60,644		55,242
Finished goods	369,771		314,168
Deferred cost of goods sold	36,824		66,634
Gross inventories	1,038,905		1,100,841
Reserve for inventory excess and obsolescence	(54,019)		(50,003)
Inventories, net	984,886		$ 1,050,838
Provision for inventory excess and obsolescence	$ 10,350	$ 5,503

PREPAID EXPENSES AND OTHER (Det

PREPAID EXPENSES AND OTHER (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023	Oct. 28, 2023
Capitalized Contract Cost [Line Items]
Prepaid VAT and other taxes	$ 87,965		$ 96,724
Prepaid expenses	60,495		58,954
Product demonstration equipment, net	40,294		40,682
Other non-trade receivables	20,910		33,408
Derivative Assets	3,020		1,118
Deferred deployment expense	2,113		1,170
Prepaid expenses and other	387,193		405,694
Depreciation of product demonstration equipment	1,900	$ 1,900
Contract assets for unbilled accounts receivable, net
Capitalized Contract Cost [Line Items]
Contract assets	151,572		150,312
Capitalized contract acquisition costs
Capitalized Contract Cost [Line Items]
Contract assets	$ 20,824		$ 23,326

OTHER BALANCE SHEET DETAILS - A

OTHER BALANCE SHEET DETAILS - Accrued Liabilities and Other Short-term Obligations (Details) - USD ($) $ in Thousands	Jan. 27, 2024	Oct. 28, 2023	Jan. 28, 2023	Oct. 29, 2022
Balance Sheet Related Disclosures [Abstract]
Compensation, payroll related tax and benefits	$ 93,937	$ 159,530
Warranty	56,400	57,089	$ 48,543	$ 45,503
Vacation	29,700	29,503
Interest payable	8,856	4,514
Income taxes payable	8,153	16,341
Foreign currency forward contracts	6,184	14,509
Finance lease liabilities	4,169	3,953
Other	122,511	145,980
Accrued liabilities and other short-term obligations	$ 329,910	$ 431,419
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued liabilities and other short-term obligations	Accrued liabilities and other short-term obligations

OTHER BALANCE SHEET DETAILS -_2

OTHER BALANCE SHEET DETAILS - Accrued Warranty (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning Balance	$ 57,089	$ 45,503
Current Period Provisions	4,841	8,230
Settlements	(5,530)	(5,190)
Ending Balance	$ 56,400	$ 48,543

OTHER BALANCE SHEET DETAILS - D

OTHER BALANCE SHEET DETAILS - Deferred Revenue (Details) - USD ($) $ in Thousands	Jan. 27, 2024	Oct. 28, 2023
Disaggregation of Revenue [Line Items]
Total deferred revenue	$ 243,270	$ 228,460
Less current portion	(166,714)	(154,419)
Long-term deferred revenue	76,556	74,041
Products
Disaggregation of Revenue [Line Items]
Total deferred revenue	24,415	28,353
Services
Disaggregation of Revenue [Line Items]
Total deferred revenue	$ 218,855	$ 200,107

DERIVATIVE INSTRUMENTS (Details

DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 27, 2024	Dec. 31, 2023	Oct. 28, 2023	Jan. 31, 2023	Apr. 30, 2022
Foreign Currency Forward Contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative asset, notional amount	$ 190.8		$ 226.3
Derivative maturity (in months)	12 months
Foreign Currency Forward Contracts | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative asset, notional amount	$ 349.5		367.3
Derivative maturity (in months)	24 months
Foreign Currency Forward Contracts | Net Investment Hedges | Designated as Hedging Instrument | INDIA
Derivative [Line Items]
Derivative asset, notional amount	$ 48.1		$ 48
Derivative maturity (in months)	24 months
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument | Secured Debt | 2025 Term Loan | SOFR
Derivative [Line Items]
Derivative asset, notional amount	$ 350				$ 350
Derivative, fixed interest rate					2.968%
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument | Secured Debt | 2030 Term Loan
Derivative [Line Items]
Derivative asset, notional amount	350			$ 350
Derivative, fixed interest rate				3.47%
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument | Secured Debt | 2030 New Term Loan
Derivative [Line Items]
Derivative asset, notional amount	$ 350	$ 350
Derivative, fixed interest rate		3.287%

SHORT-TERM AND LONG-TERM DEBT -

SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended
	Oct. 24, 2023	Jan. 19, 2023	Jan. 27, 2024	Jan. 28, 2023	Oct. 28, 2023	Jan. 18, 2022
Secured Debt
Debt Instrument [Line Items]
Repayments of debt	$ 1,200,000
2030 New Term Loan | Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount	1,200,000		$ 1,170,000
Installment payment	2,900
Annual payments	11,700
Amortization of debt issuance costs			200
Fair value of debt			1,200,000
2030 New Term Loan | Senior Notes
Debt Instrument [Line Items]
Deferred debt issuance costs			6,200		$ 5,500
The Credit Facility | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300,000
2025 Term Loan | Secured Debt
Debt Instrument [Line Items]
Amortization of debt issuance costs				$ 200
2030 Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount		$ 500,000
Proceeds from issuance of debt		$ 492,500
2030 Notes
Debt Instrument [Line Items]
Deferred debt issuance costs			363,500
2030 Notes | Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount			400,000
2030 Notes | Senior Notes
Debt Instrument [Line Items]
Deferred debt issuance costs			4,100		$ 4,300
Amortization of debt issuance costs			$ 200	$ 200
Debt instrument, face amount						$ 400,000
Debt instrument, interest rate, stated percentage						4%

SHORT-TERM AND LONG-TERM DEBT_2

SHORT-TERM AND LONG-TERM DEBT - Net Carrying Values of Term Loans (Details) - Secured Debt - USD ($) $ in Thousands	Jan. 27, 2024	Oct. 28, 2023	Oct. 24, 2023
2030 New Term Loan
Debt Instrument [Line Items]
Principal Balance	$ 1,170,000		$ 1,200,000
Unamortized Discount	(4,934)
Deferred Debt Issuance Costs	(6,157)
Net Carrying Value	1,158,909	$ 1,159,371
2030 Notes
Debt Instrument [Line Items]
Principal Balance	400,000
Deferred Debt Issuance Costs	(4,091)
Net Carrying Value	$ 395,909	$ 395,735

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity - beginning balance	$ 2,848,361	$ 2,712,861
Other comprehensive gain (loss) before reclassifications	16,074	20,433
Amounts reclassified from AOCI	(3,174)	(3,087)
Equity- ending balance	2,923,499	2,838,295
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity - beginning balance	(37,767)	(46,645)
Equity- ending balance	(24,867)	(29,299)
Available-for-sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity - beginning balance	(372)	(2,965)
Other comprehensive gain (loss) before reclassifications	895	1,050
Amounts reclassified from AOCI	0	0
Equity- ending balance	523	(1,915)
Unrealized Gain (Loss) Derivatives | Foreign Currency Forward Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity - beginning balance	(8,156)	(10,197)
Other comprehensive gain (loss) before reclassifications	6,448	7,630
Amounts reclassified from AOCI	708	(2,288)
Equity- ending balance	(1,000)	(4,855)
Unrealized Gain (Loss) Derivatives | Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity - beginning balance	18,962	9,397
Other comprehensive gain (loss) before reclassifications	(5,592)	(4,226)
Amounts reclassified from AOCI	(3,882)	(799)
Equity- ending balance	9,488	4,372
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity - beginning balance	(48,201)	(42,880)
Other comprehensive gain (loss) before reclassifications	14,323	15,979
Amounts reclassified from AOCI	0	0
Equity- ending balance	$ (33,878)	$ (26,901)

EARNINGS_PER SHARE CALCULATIO_2

EARNINGS PER SHARE CALCULATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Earnings Per Share [Abstract]
Net income	$ 49,547	$ 76,241
Basic weighted average shares outstanding (in shares)	145,291	149,081
Effect of dilutive potential common shares (in shares)	557	470
Dilutive weighted average shares (in shares)	145,848	149,551
Basic EPS (in dollars per share)	$ 0.34	$ 0.51
Diluted EPS (in dollars per share)	$ 0.34	$ 0.51
Antidilutive employee share-based awards, excluded (in shares)	2,491	2,768

STOCKHOLDERS_ EQUITY (Details)

STOCKHOLDERS’ EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023	Dec. 09, 2021
Equity [Abstract]
Stock repurchase program authorized amount			$ 1,000,000
Repurchase of common stock under the stock repurchase program (in shares)	0.7
Repurchase of common stock under the stock repurchase program (in shares)	$ 32,000
Repurchase of common stock under the stock repurchase program (in dollars per share)	$ 46.30
Aggregate shares repurchased (in shares)	14.8
Aggregate shares repurchased	$ 782,000
Aggregate average price of shares repurchased (in dollars per share)	$ 52.85
Authorized funds remaining under stock repurchase program	$ 218,000
Shares repurchased for tax withholdings on vesting of restricted stock units	$ 10,076	$ 12,980

SHARE-BASED COMPENSATION EXPE_3

SHARE-BASED COMPENSATION EXPENSE - Schedule of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense capitalized in inventory, net	$ 225	$ 38
Total share-based compensation expense	37,827	30,512
Share-based compensation expense included in cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense included in operating expense	4,338	3,348
Products
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense included in operating expense	1,318	1,051
Services
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense included in operating expense	3,020	2,297
Share-based compensation expense included in operating expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense included in operating expense	33,264	27,126
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense included in operating expense	12,880	9,234
Selling and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense included in operating expense	10,305	8,424
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense included in operating expense	$ 10,079	$ 9,468

SHARE-BASED COMPENSATION EXPE_4

SHARE-BASED COMPENSATION EXPENSE - Narrative (Details) - Restricted Stock Units (RSUs) $ in Millions	3 Months Ended
	Jan. 27, 2024 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation	$ 333.9
Weighted-average period for recognition of share-based compensation (in years)	1 year 6 months 21 days

SEGMENTS AND ENTITY-WIDE DISC_3

SEGMENTS AND ENTITY-WIDE DISCLOSURES - Narrative (Details) $ in Thousands	3 Months Ended
	Jan. 27, 2024 USD ($) segment	Oct. 28, 2023 USD ($)
Segment Reporting [Abstract]
Equipment, building, furniture and fixtures, net	$ 280,357	$ 280,147
Operating right-of-use assets	$ 35,679	$ 35,140
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	Jan. 27, 2024	Oct. 28, 2023
Segment Reporting Information [Line Items]
Other intangible assets, net	$ 195,682
Goodwill	445,084	$ 444,765
Maintenance spares, net	56,266
Networking Platforms
Segment Reporting Information [Line Items]
Other intangible assets, net	181,155
Goodwill	199,844
Maintenance spares, net	0
Platform Software and Services
Segment Reporting Information [Line Items]
Other intangible assets, net	0
Goodwill	156,191
Maintenance spares, net	0
Blue Planet Automation Software and Services
Segment Reporting Information [Line Items]
Other intangible assets, net	14,527
Goodwill	89,049
Maintenance spares, net	0
Global Services
Segment Reporting Information [Line Items]
Other intangible assets, net	0
Goodwill	0
Maintenance spares, net	$ 56,266

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
	Jan. 27, 2024	Jan. 28, 2023
Less: Non-performance operating expenses
Selling and marketing	$ 128,158	$ 123,807
General and administrative	54,683	50,896
Significant asset impairments and restructuring costs	4,971	4,298
Amortization of intangible assets	7,252	7,441
Acquisition and integration costs	0	2,558
Add: Other non-performance financial items
Interest and other income, net	10,650	31,973
Interest expense	(23,776)	(15,870)
Less: Provision for income taxes	21,956	25,078
Net income	49,547	76,241
Operating Segments
Add: Other non-performance financial items
Net income	279,693	274,216
Operating Segments | Networking Platforms
Add: Other non-performance financial items
Net income	183,775	202,147
Operating Segments | Platform Software and Services
Add: Other non-performance financial items
Net income	58,004	45,650
Operating Segments | Blue Planet Automation Software and Services
Add: Other non-performance financial items
Net income	(7,069)	(11,059)
Operating Segments | Global Services
Add: Other non-performance financial items
Net income	$ 44,983	$ 37,478

SEGMENTS AND ENTITY-WIDE DISC_6

SEGMENTS AND ENTITY-WIDE DISCLOSURES - Geographic Distribution of Equipment, Building, Furniture and Fixtures (Details) - USD ($) $ in Thousands	Jan. 27, 2024	Oct. 28, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net	$ 316,036	$ 315,287
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net	230,712	229,707
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net	47,231	46,933
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Equipment, building, furniture and fixtures, net	$ 38,093	$ 38,647

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) $ in Billions	Jan. 27, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase obligation	$ 1.9

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Mar. 01, 2024	Jan. 27, 2024
Subsequent Event [Line Items]
Repurchase of common stock under the stock repurchase program (in shares)		0.7
Repurchase of common stock under the stock repurchase program (in shares)		$ 32
Repurchase of common stock under the stock repurchase program (in dollars per share)		$ 46.30
Aggregate shares repurchased (in shares)		14.8
Authorized funds remaining under stock repurchase program		$ 218
Subsequent event
Subsequent Event [Line Items]
Repurchase of common stock under the stock repurchase program (in shares)	0.3
Repurchase of common stock under the stock repurchase program (in shares)	$ 19.2
Repurchase of common stock under the stock repurchase program (in dollars per share)	$ 55.44
Aggregate shares repurchased (in shares)	15.1
Authorized funds remaining under stock repurchase program	$ 198.8