Ciena (CIEN) 10-K 15 Dec 23 2023 FY Annual report Financial data

Cover

Cover - USD ($) $ in Billions	12 Months Ended
	Oct. 28, 2023	Dec. 08, 2023	Apr. 28, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Oct. 28, 2023
Current Fiscal Year End Date	--10-28
Document Transition Report	false
Entity File Number	001-36250
Entity Registrant Name	Ciena Corp
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	23-2725311
Entity Address, Address Line One	7035 Ridge Road
Entity Address, City or Town	Hanover
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	21076
City Area Code	410
Local Phone Number	694-5700
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	CIEN
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 6.8
Entity Common Stock, Shares Outstanding		144,830,337
Documents Incorporated by Reference	Part III of the Form 10-K incorporates by reference certain portions of the registrant’s definitive proxy statement for its 2024 Annual Meeting of Stockholders to be filed with the Commission not later than 120 days after the end of the fiscal year covered by this report.
Entity Central Index Key	0000936395
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Oct. 28, 2023
Audit Information [Abstract]
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Baltimore, Maryland

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Current assets:
Cash and cash equivalents	$ 1,010,618	$ 994,352
Short-term investments	104,753	153,989
Accounts receivable, net	1,003,876	920,772
Inventories, net	1,050,838	946,730
Prepaid expenses and other	405,694	370,053
Total current assets	3,575,779	3,385,896
Long-term investments	134,278	35,385
Equipment, building, furniture and fixtures, net	280,147	267,779
Operating right-of-use assets	35,140	45,108
Goodwill	444,765	328,322
Other intangible assets, net	205,627	69,517
Deferred tax asset, net	809,306	824,008
Other long-term assets	116,453	113,617
Total assets	5,601,495	5,069,632
Current liabilities:
Accounts payable	317,828	516,047
Accrued liabilities and other short-term obligations	431,419	360,782
Deferred revenue	154,419	137,899
Operating lease liabilities	16,655	18,925
Current portion of long-term debt	11,700	6,930
Total current liabilities	932,021	1,040,583
Long-term deferred revenue	74,041	62,336
Other long-term obligations	170,407	150,335
Long-term operating lease liabilities	33,259	42,392
Long-term debt, net	1,543,406	1,061,125
Total liabilities	2,753,134	2,356,771
Commitments and contingencies (Note 27)
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; 144,829,938 and 148,412,943 shares issued and outstanding	1,448	1,484
Additional paid-in capital	6,262,083	6,390,252
Accumulated other comprehensive loss	(37,767)	(46,645)
Accumulated deficit	(3,377,403)	(3,632,230)
Total stockholders’ equity	2,848,361	2,712,861
Total liabilities and stockholders’ equity	$ 5,601,495	$ 5,069,632

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Oct. 28, 2023	Oct. 29, 2022
Statement of Financial Position [Abstract]
Preferred stock, par value (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 (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	290,000,000	290,000,000
Common stock, shares issued (in shares)	144,829,938	148,412,943
Common stock, shares outstanding (in shares)	144,829,938	148,412,943

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Revenue:
Total revenue	$ 4,386,549	$ 3,632,661	$ 3,620,684
Cost of goods sold:
Total cost of goods sold	2,507,698	2,072,317	1,898,705
Gross profit	1,878,851	1,560,344	1,721,979
Operating expenses:
Research and development	750,559	624,656	536,666
Selling and marketing	490,804	466,565	452,214
General and administrative	215,284	179,382	181,874
Significant asset impairments and restructuring costs	23,834	33,824	29,565
Amortization of intangible assets	37,351	32,511	23,732
Acquisition and integration costs	3,474	598	2,572
Total operating expenses	1,521,306	1,337,536	1,226,623
Income from operations	357,545	222,808	495,356
Interest and other income (loss), net	62,008	6,747	(1,768)
Interest expense	(88,026)	(47,050)	(30,837)
Loss on extinguishment and modification of debt	(7,874)	0	0
Income before income taxes	323,653	182,505	462,751
Provision (benefit) for income taxes	68,826	29,603	(37,445)
Net income	$ 254,827	$ 152,902	$ 500,196
Basic net income per common share (in dollars per share)	$ 1.71	$ 1.01	$ 3.22
Diluted net income per potential common share (in dollars per share)	$ 1.71	$ 1	$ 3.19
Weighted average basic common shares outstanding (in shares)	148,971	151,208	155,279
Weighted average diluted potential common shares outstanding (in shares)	149,380	152,193	156,743
Products
Revenue:
Total revenue	$ 3,581,039	$ 2,888,848	$ 2,932,602
Cost of goods sold:
Total cost of goods sold	2,088,440	1,699,631	1,545,269
Services
Revenue:
Total revenue	805,510	743,813	688,082
Cost of goods sold:
Total cost of goods sold	$ 419,258	$ 372,686	$ 353,436

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Net income	$ 254,827	$ 152,902	$ 500,196
Change in unrealized gain (loss) on available-for-sale securities, net of tax	2,593	(2,801)	(209)
Change in cumulative translation adjustments	(5,321)	(49,446)	20,215
Other comprehensive income gain (loss)	8,878	(47,084)	35,797
Total comprehensive income	263,705	105,818	535,993
Change in unrealized gain (loss) on foreign currency forward contracts, net of tax
Change in unrealized gain (loss) on derivatives	2,041	(16,413)	6,435
Change in unrealized gain on interest rate swaps, net of tax
Change in unrealized gain (loss) on derivatives	$ 9,565	$ 21,576	$ 9,356

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Oct. 31, 2020			154,563,005
Beginning balance at Oct. 31, 2020	$ 2,509,597	$ (2,206)	$ 1,546	$ 6,826,531	$ (35,358)	$ (4,283,122)	$ (2,206)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	500,196					500,196
Other comprehensive income (loss)	35,797				35,797
Repurchases of common stock - repurchase program, net (in shares)			(1,696,949)
Repurchases of common stock - repurchase program, net	(92,088)		$ (17)	(92,071)
Issuance of shares from employee equity plans (in shares)			2,826,399
Issuance of shares from employee equity plans	28,457		$ 28	28,429
Share-based compensation expense	84,336			84,336
Shares repurchased for tax withholdings on vesting of stock units awards (in shares)			(833,474)
Shares repurchased for tax withholdings on vesting of stock unit awards	(44,071)		$ (8)	(44,063)
Ending balance (in shares) at Oct. 30, 2021			154,858,981
Ending balance at Oct. 30, 2021	3,020,018		$ 1,549	6,803,162	439	(3,785,132)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	152,902					152,902
Other comprehensive income (loss)	(47,084)				(47,084)
Repurchases of common stock - repurchase program, net (in shares)			(8,433,957)
Repurchases of common stock - repurchase program, net	(500,000)		$ (84)	(499,916)
Issuance of shares from employee equity plans (in shares)			2,807,123
Issuance of shares from employee equity plans	30,348		$ 27	30,321
Share-based compensation expense	105,131			105,131
Shares repurchased for tax withholdings on vesting of stock units awards (in shares)			(819,204)
Shares repurchased for tax withholdings on vesting of stock unit awards	$ (48,454)		$ (8)	(48,446)
Ending balance (in shares) at Oct. 29, 2022	148,412,943		148,412,943
Ending 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	254,827
Other comprehensive income (loss)	8,878				8,878
Repurchases of common stock - repurchase program, net (in shares)			(5,672,123)
Repurchases of common stock - repurchase program, net	(251,511)		$ (57)	(251,454)
Issuance of shares from employee equity plans (in shares)			2,900,038
Issuance of shares from employee equity plans	31,357		$ 29	31,328
Share-based compensation expense	130,455			130,455
Shares repurchased for tax withholdings on vesting of stock units awards (in shares)			(810,920)
Shares repurchased for tax withholdings on vesting of stock unit awards	$ (38,506)		$ (8)	(38,498)
Ending balance (in shares) at Oct. 28, 2023	144,829,938		144,829,938
Ending balance at Oct. 28, 2023	$ 2,848,361		$ 1,448	$ 6,262,083	$ (37,767)	$ (3,377,403)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Cash flows provided by (used in) operating activities:
Net income	$ 254,827	$ 152,902	$ 500,196
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Loss on extinguishment of debt	1,864	0	0
Depreciation of equipment, building, furniture and fixtures, and amortization of leasehold improvements	92,564	95,922	96,233
Share-based compensation costs	130,455	105,131	84,336
Amortization of intangible assets	49,616	44,281	36,033
Deferred taxes	(14,852)	(27,502)	(156,469)
Provision for inventory excess and obsolescence	29,464	16,184	17,850
Provision for warranty	31,742	17,440	17,093
Gain on cost method equity investments, net	(26,368)	(4,120)	(164)
Other	15,771	4,120	14,689
Changes in assets and liabilities:
Accounts receivable	(94,565)	(47,069)	(174,377)
Inventories	(132,497)	(589,113)	(47,567)
Prepaid expenses and other	(51,965)	(58,996)	(19,691)
Operating lease right-of-use assets	14,190	16,453	16,632
Accounts payable, accruals and other obligations	(138,469)	100,327	162,134
Deferred revenue	27,412	26,380	16,822
Short and long-term operating lease liabilities	(20,857)	(20,096)	(22,104)
Net cash provided by (used in) operating activities	168,332	(167,756)	541,646
Cash flows used in investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(106,197)	(90,818)	(79,550)
Purchases of investments	(252,329)	(647,526)	(170,525)
Proceeds from sales and maturities of investments	208,104	702,197	150,000
Proceeds from sale of cost method equity investment	0	0	4,678
Purchase of cost method equity investment	0	(8,000)	0
Settlement of foreign currency forward contracts, net	(2,984)	4,942	4,680
Acquisition of businesses, net of cash acquired	(230,048)	(62,043)	0
Net cash used in investing activities	(383,454)	(101,248)	(90,717)
Cash flows provided by (used in) financing activities:
Proceeds from issuance of senior notes	0	400,000	0
Proceeds from issuance of term loan, net	497,500	0	0
Payment of long-term debt	(9,430)	(5,197)	(6,929)
Proceeds from modification of term loan	830	0	0
Payment of debt issuance costs	(6,379)	(5,484)	0
Payment of finance lease obligations	(3,791)	(3,468)	(3,004)
Shares repurchased for tax withholdings on vesting of stock unit awards	(38,506)	(48,454)	(44,071)
Repurchases of common stock - repurchase program, net	(242,201)	(500,800)	(91,288)
Proceeds from issuance of common stock	31,357	30,348	28,457
Net cash provided by (used in) financing activities	229,380	(133,055)	(116,835)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,150	(26,167)	(198)
Net increase (decrease) in cash, cash equivalents and restricted cash	16,408	(428,226)	333,896
Cash, cash equivalents and restricted cash at beginning of fiscal year	994,378	1,422,604	1,088,708
Cash, cash equivalents and restricted cash at end of fiscal year	1,010,786	994,378	1,422,604
Supplemental disclosure of cash flow information
Cash paid during the fiscal year for interest	84,465	42,812	29,864
Cash paid during the fiscal year for income taxes, net	78,242	34,967	73,127
Operating lease payments	22,782	21,661	24,058
Non-cash investing and financing activities
Purchase of equipment in accounts payable	6,990	12,373	10,138
Repurchase of common stock in accrued liabilities from repurchase program	9,310	0	800
Operating lease right-of-use assets subject to lease liability	10,236	23,242	4,356
Gain on cost method equity investment	$ 26,368	$ 4,120	$ 164

CIENA CORPORATION AND SIGNIFICA

CIENA CORPORATION AND SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES	12 Months Ended
	Oct. 28, 2023
Accounting Policies [Abstract]
CIENA CORPORATION AND SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES	CIENA CORPORATION AND SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES Description of Business Ciena Corporation (“Ciena” or the “Company”) is a network platform, software, and services company, providing solutions that enable a wide range of network operators to deploy and manage next-generation networks that deliver services to businesses and consumers. Ciena provides hardware, software and services that support the delivery of video, data and voice traffic over core, metro, aggregation and access communications networks. Ciena’s solutions are used globally by communications service providers, cable and multiservice operators, cloud providers, submarine network operators, governments, and enterprises across multiple industry verticals. Ciena’s portfolio is designed to enable the Adaptive Network™, Ciena’s vision for a network end state that leverages a programmable and scalable network infrastructure, driven by software control and automation capabilities, that is informed by network analytics and intelligence. By transforming network infrastructures into dynamic, programmable environments driven by automation and analytics, network operators can realize greater business agility, adapt dynamically to changing end-user service demands and rapidly introduce new revenue-generating services. They can also gain valuable real-time network insights, allowing them to optimize network performance and maximize the return on their network infrastructure investment. Ciena’s solutions include Networking Platforms, including its Optical Networking portfolio and Routing and Switching portfolio, which can be applied from the network core to end-user access points, and which allow network operators to scale capacity, increase transmission speeds, allocate traffic efficiently and adapt dynamically to changing end-user service demands. Ciena’s Optical Networking portfolio, which was previously referred to as Ciena’s Converged Packet Optical portfolio, includes products that support long haul and regional networks, submarine and data center interconnect networks, and metro and edge networks. Ciena’s Routing and Switching portfolio includes products and solutions that enable efficient internet protocol (“IP”) transport in next-generation metro, core, aggregation, and access networks, including in enterprise edge and broadband access applications. To complement its Networking Platforms, Ciena offers Platform Software, which includes its Manage, Control and Plan (“MCP”) applications that deliver advanced multi-layer domain control and operations. Ciena, through its Blue Planet ® Software, also enables complete service lifecycle management automation with productized operational support systems (“OSS”), which include inventory, orchestration and assurance solutions that help its customers to achieve closed loop automation across multi-vendor and multi-domain environments. In addition to its systems and software, Ciena also offers a broad range of services that help its customers build, operate and improve their networks and associated operational environments. These include network transformation, consulting, implementation, systems integration, maintenance, network operations center (“NOC”) management, learning, and optimization services. Basis of Presentation The accompanying consolidated financial statements include the accounts of Ciena and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. Ciena has a 52 or 53-week fiscal year, which ends on the Saturday nearest to the last day of October in each year ( October 28, 2023 , October 29, 2022, and October 30, 2021, for the periods reported). Fiscal 2023, fiscal 2022 and fiscal 2021 each consisted of a 52-week fiscal year. Business Combinations Ciena records acquisitions using the purchase method of accounting. All of the assets acquired, liabilities assumed, contractual contingencies and contingent consideration are recognized at their fair value as of the acquisition date. The excess of the purchase price over the estimated fair values of the net tangible and net intangible assets acquired is recorded as goodwill. The application of the purchase method of accounting for business combinations requires management to make significant estimates and assumptions in the determination of the fair value of assets acquired and liabilities assumed, in order to properly allocate purchase price consideration between assets that are depreciated and amortized from goodwill. These assumptions and estimates include a market participant’s use of the asset and the appropriate discount rates for a market participant. Ciena’s estimates are based on historical experience, information obtained from the management of the acquired companies and, when appropriate, include assistance from independent third-party appraisal firms. Significant assumptions and estimates can include, but are not limited to, the cash flows that an asset is expected to generate in the future, the appropriate weighted-average cost of capital and the cost savings expected to be derived from acquiring an asset. These estimates are inherently uncertain and unpredictable. In addition, unanticipated events and circumstances may occur which may affect the accuracy or validity of such estimates. Use of Estimates The preparation of the financial statements and related disclosures in conformity with Generally Accepted Accounting Principles (“GAAP”) requires management to make estimates and judgments that affect the amounts reported in the consolidated financial statements and accompanying notes. Estimates are used for selling prices for multiple element arrangements, shared-based compensation, bad debts, valuation of inventories and investments, recoverability of intangible assets, other long-lived assets and goodwill, income taxes, warranty obligations, restructuring liabilities, derivatives, contingencies and litigation. Ciena bases its estimates on historical experience and assumptions that it believes are reasonable. Actual results may differ materially from management’s estimates. Cash and Cash Equivalents Ciena considers all highly liquid investments purchased with original maturities of three months or less to be cash equivalents. Any restricted cash collateralizing letters of credit is included in other current assets and other long-term assets depending on the duration of the restriction. Investments Ciena’s investments in debt securities are classified as available-for-sale and reported at fair value, with unrealized gains and losses recorded in accumulated other comprehensive loss. Ciena recognizes losses in the income statement when it determines that declines in the fair value of its investments below their cost basis are other-than-temporary. In determining whether a decline in fair value is other-than-temporary, Ciena considers various factors, including market price (when available), investment ratings, the financial condition and near-term prospects of the investee, the length of time and the extent to which the fair value has been less than Ciena’s cost basis, and Ciena’s intent and ability to hold the investment until maturity or for a period of time sufficient to allow for any anticipated recovery in market value. Ciena considers all marketable debt securities that it expects to convert to cash within one year or less to be short-term investments, with all others considered to be long-term investments. Ciena has minority equity investments in privately held technology companies that are classified in other long-term assets. These investments are carried at cost because Ciena owns less than 20% of the voting equity and does not have the ability to exercise significant influence over the company. Ciena monitors these investments for impairment and makes appropriate reductions to the carrying value when necessary. As of October 28, 2023 , the combined carrying value of these investments was minimal. Ciena elects to estimate the fair value at cost minus impairment, if any, plus or minus observable price changes in orderly transactions for identical or similar investments of the same issuer. Ciena evaluates these investments for impairment or observable price changes quarterly and records adjustments to interest and other income (loss), net on the Consolidated Statements of Operations. Inventories Inventories are stated at the lower of cost or market, with cost computed using standard cost, which approximates actual cost, on a first-in, first-out basis. Ciena records a provision for excess and obsolete inventory when an impairment has been identified. Segment Reporting Ciena’s chief operating decision maker, its chief executive officer, evaluates the Company’s performance and allocates resources based on multiple factors, including measures of segment profit (loss). Operating segments are defined as components of an enterprise that engage in business activities that may earn revenue and incur expense, for which discrete financial information is available, and for which such information is evaluated regularly by the chief operating decision maker for purposes of allocating resources and assessing performance. 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. See Note 25 below. Goodwill Goodwill is the excess of the purchase price over the fair values assigned to the net assets acquired in a business combination. Ciena tests goodwill for impairment on an annual basis, which it has determined to be the last business day of fiscal September each year. Ciena also tests goodwill for impairment between annual tests if an event occurs or circumstances change that would, more likely than not, reduce the fair value of the reporting unit below its carrying value. Annually, Ciena tests goodwill impairment qualitatively, or quantitatively by comparing the fair value of the reporting unit with the unit’s carrying amount, including goodwill. If this test indicates that the fair value is less than the carrying value, then an impairment loss is recognized limited to the total amount of goodwill allocated to that reporting unit. A non-cash goodwill impairment charge would have the effect of decreasing earnings or increasing losses in such period. If Ciena is required to take a substantial impairment charge, its operating results would be materially adversely affected in such period. Long-lived Assets Long-lived assets include equipment, building, furniture and fixtures, operating right-of-use (“ROU”) assets, finite-lived intangible assets and maintenance spares. Ciena tests long-lived assets for impairment whenever triggering events or changes in circumstances indicate that the asset’s carrying amount is not recoverable from its undiscounted cash flows. An impairment loss is measured as the amount by which the carrying amount of the asset or asset group exceeds its fair value. Ciena’s long-lived assets are assigned to asset groups that represent the lowest level for which cash flows can be identified. Equipment, Building, Furniture and Fixtures and Internal Use Software Equipment, building, furniture and fixtures are recorded at cost. Depreciation and amortization are computed using the straight-line method, generally over useful lives of three years to five years for equipment and furniture and fixtures and the shorter of useful life or lease term for leasehold improvements. Qualifying internal use software and website development costs incurred during the application development stage, which consist primarily of outside services and purchased software license costs, are capitalized and amortized straight-line over the estimated useful lives of two years to five years. Leases At the inception of a contract, Ciena must determine whether the contract is or contains a lease. The contract is or contains a lease if the contract conveys the right to control the use of the property, plant, or equipment for a designated term in exchange for consideration. Ciena’s evaluation of its contracts follows the assessment of whether there is a right to obtain substantially all of the economic benefits from the use and the right to direct the use of the identified asset in the contract. Operating leases are included in the Operating ROU assets, Operating lease liabilities and Long-term operating lease liabilities in the Consolidated Balance Sheets. Finance leases are included in Equipment, building, furniture and fixtures, net (“Finance ROU assets”), Accrued liabilities and other short-term obligations and Other long-term obligations in the Consolidated Balance Sheets. Ciena has operating and finance leases that primarily relate to real property. Ciena has elected not to capitalize leases with a term of 12 months or less without a purchase option that it is likely to exercise. Ciena has elected not to separate lease and non-lease components of operating and finance leases. Lease components are payment items directly attributable to the use of the underlying asset, while non-lease components are explicit elements of a contract not directly related to the use of the underlying asset, including pass-through operating expenses like common area maintenance and utilities. Operating ROU assets and lease liabilities and Finance ROU assets and lease liabilities are recognized on the Consolidated Balance Sheets at the present value of the future lease payments over the life of the lease term. Ciena uses discount rates based on incremental borrowing rates, on a collateralized basis, for the respective underlying assets, for terms similar to the respective leases when implicit rates for leases are not determinable. Operating lease costs are included as rent expense in the Consolidated Statements of Operations. Fixed base payments on operating leases paid directly to the lessor are recorded as lease expense on a straight-line basis. Related variable payments based on usage, changes in an index, or market rate are expensed as incurred. Finance ROU assets are generally amortized on a straight-line basis over the lease term with the interest expense on the lease liability recorded using the interest method. The amortization and interest expense are recorded separately in the Consolidated Statements of Operations. Intangible Assets Ciena has recorded finite-lived intangible assets as a result of several acquisitions. Finite-lived intangible assets are carried at cost less accumulated amortization. Amortization is computed using the straight-line method over the expected economic lives of the respective assets, up to seven years, which approximates the use of intangible assets. Cloud Computing Arrangements Ciena capitalizes certain costs related to hosting arrangements that are service contracts (cloud computing arrangements). Capitalized costs are included in Other long-term assets in the Consolidated Balance Sheets and are amortized on a straight-line basis over the estimated useful life. Maintenance Spares Maintenance spares are recorded at cost. Ciena depreciates spares ratably over four years. Concentrations Substantially all of Ciena’s cash and cash equivalents are maintained at a small number of major U.S. financial institutions. The majority of Ciena’s cash equivalents consist of money market funds. Deposits held with banks may exceed the amount of insurance provided on such deposits. Because these deposits generally may be redeemed upon demand, management believes that they bear minimal risk. Historically, a significant percentage of Ciena’s revenue has been concentrated among sales to a small number of large communications service providers and cloud providers. Consolidation among Ciena’s customers has increased this concentration. Consequently, Ciena’s accounts receivable are concentrated among these customers. See Note 2 below. Additionally, Ciena’s access to certain materials or components is dependent on sole or limited source suppliers. The inability of any of these suppliers to fulfill Ciena’s supply requirements, or significant changes in supply cost, could affect future results. Ciena relies on a small number of contract manufacturers to perform the majority of the manufacturing for its products. If Ciena cannot effectively manage these manufacturers or forecast future demand, or if these manufacturers fail to deliver products or components on time, Ciena’s business and results of operations may suffer. Revenue Recognition Ciena recognizes revenue when control of the promised products or services is transferred to its customer, in an amount that reflects the consideration to which Ciena expects to be entitled in exchange for those products or services. Ciena determines revenue recognition by applying the following five-step approach: • identification of the contract, or contracts, with a customer; • identification of the performance obligations in the contract; • determination of the transaction price; • allocation of the transaction price to the performance obligations in the contract; and • recognition of revenue when, or as, Ciena satisfies a performance obligation. Generally, Ciena makes sales pursuant to purchase orders placed by customers under framework agreements that govern the general commercial terms and conditions of the sale of Ciena’s products and services. These purchase orders under framework agreements are used to determine the identification of the contract or contracts with this customer. Purchase orders typically include the description, quantity, and price of each product or service purchased. Purchase orders may include one-line bundled pricing for both products and services. Accordingly, purchase orders can include various combinations of products and services that are generally distinct and accounted for as separate performance obligations. Ciena evaluates each promised product and service offering to determine whether it represents a distinct performance obligation. In doing so, Ciena considers, among other things, customary business practices, whether the customer can benefit from the product or service on its own or together with other resources that are readily available, and whether Ciena’s commitment to transfer the product or service to the customer is separately identifiable from other obligations in the purchase order. For transactions where Ciena delivers the product or services, Ciena is typically the principal and records revenue and costs of goods sold on a gross basis. Purchase orders are invoiced based on the terms set forth either in the purchase order or the framework agreement, as applicable. Generally, sales of products and software licenses are invoiced upon shipment or delivery. Maintenance and software subscription services are invoiced quarterly or annually in advance of the service term. Ciena’s other service offerings are generally invoiced upon completion of the service. Payment terms and cash received typically range from 30 to 90 days from the invoicing date. Historically, Ciena has not provided any material financing arrangements to its customers. As a practical expedient, Ciena does not adjust the amount of consideration it will receive for the effects of a significant financing component as it expects, at contract inception, that the period between Ciena’s transfer of the products or services to the customer and customer payment for the products or services will be one year or less. Shipping and handling fees invoiced to customers are included in revenue, with the associated expense included in product cost of goods sold. Ciena records revenue net of any associated sales taxes. Ciena recognizes revenue upon the transfer of control of promised products or services to a customer. Transfer of control occurs once the customer has the contractual right to use the product, generally upon shipment or delivery to the customer. Transfer of control can also occur over time for services such as software subscription, maintenance, installation, and various professional services as the customer receives the benefit over the contract term. Significant Judgments Revenue is allocated among performance obligations based on standalone selling price (“SSP”). SSP reflects the price at which Ciena would expect to sell that product or service on a stand-alone basis at contract inception and that Ciena would expect to be entitled to receive for the promised products or services. SSP is estimated for each distinct performance obligation, and judgment may be required in its determination. The best evidence of SSP is the observable price of a product or service when Ciena sells the products separately in similar circumstances and to similar customers. In instances where SSP is not directly observable, Ciena determines SSP using information that may include market conditions and other observable inputs. Ciena applies judgment in determining the transaction price, as Ciena may be required to estimate variable consideration when determining the amount of revenue to recognize. Variable consideration can include various rebate, cooperative marketing, and other incentive programs that Ciena offers to its distributors, partners and customers. When determining the amount of revenue to recognize, Ciena estimates the expected usage of these programs, applying the expected value or most likely estimate and updates the estimate at each reporting period as actual utilization data becomes available. Ciena also considers any customer right of return and any actual or potential payment of liquidated damages, contractual or similar penalties, or other claims for performance failures or delays in determining the transaction price, where applicable. When transfer of control is judged to be over time for installation and professional service arrangements, Ciena applies the input method to determine the amount of revenue to be recognized in a given period. Utilizing the input method, Ciena recognizes revenue based on the ratio of actual costs incurred to date to the total estimated costs expected to be incurred. Revenue for software subscription and maintenance is recognized ratably over the period during which the services are performed. Capitalized Contract Acquisition Costs Ciena has considered the impact of the guidance in Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 340-40, Other Assets and Deferred Costs; Contracts with Customers , and the interpretations of the FASB Transition Resource Group for Revenue Recognition with respect to capitalization and amortization of incremental costs of obtaining a contract. In conjunction with this interpretation, Ciena considers each customer purchase in combination with the corresponding framework agreement, if applicable, as a contract. Ciena has elected to implement the practical expedient, which allows for incremental costs to be recognized as an expense when incurred if the period of the asset recognition is one year or less. If the period of the asset recognition is greater than one year, Ciena amortizes these costs over the period of performance. Ciena considers sales commissions incurred upon receipt of purchase orders placed by customers as incremental costs to obtain such purchase orders. The practical expedient method is applied to the purchase order as a whole and thus the capitalized costs of obtaining a purchase order is applied even if the purchase order contains more than one performance obligation. In cases where a purchase order includes various distinct products or services with both short-term (one year or less) and long-term (more than a year) performance periods, the cost of commissions incurred for the total value of the purchase order is capitalized and subsequently amortized as each performance obligation is recognized. For the additional disclosures on capitalized contract acquisition costs, see Note 2 below. Warranty Accruals Ciena provides for the estimated costs to fulfill customer warranty obligations upon recognition of the related revenue. Estimated warranty costs include estimates for material costs, technical support labor costs and associated overhead. Warranty is included in cost of goods sold and is determined based on actual warranty cost experience, estimates of component failure rates and management’s industry experience. Ciena’s sales contracts do not permit the right of return of the product by the customer after the product has been accepted. Allowance for Credit Losses for Accounts Receivable and Contract Assets Ciena estimates its allowances for credit losses using relevant available information from internal and external sources, related to past events, current conditions and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. When assessing for credit losses, Ciena determines collectability by pooling assets with similar characteristics. The allowances for credit losses are each measured on a collective basis when similar risk characteristics exist. The allowances for credit losses are each measured by multiplying the exposure probability of default (the probability that the asset will default within a given time frame) by the loss given default rate (the percentage of the asset not expected to be collected due to default) based on the pool of assets. Probability of default rates are published by third-party credit rating agencies. Adjustments to Ciena’s exposure probability may take into account a number of factors, including, but not limited to, various customer-specific factors, the potential sovereign risk of the geographic locations in which the customer is operating and macroeconomic conditions. These factors are updated regularly or when facts and circumstances indicate that an update is deemed necessary. Accounts Receivable Factoring Ciena has entered into factoring agreements to sell certain receivables to unrelated third-party financial institution on a non-recourse basis. These transactions are accounted for in accordance with ASC Topic 860, “Transfers and Servicing” and result in a reduction in accounts receivable because the agreements transfer effective control over, and risk related to, the receivables to the buyers. Ciena's factoring agreements do not allow for recourse in the event of uncollectability, and Ciena does not retain any interest in the underlying accounts receivable once sold. Trade accounts receivables balances sold are removed from the consolidated balance sheets and cash received is reflected as cash provided by (used in) operating activities in the Consolidated Statements of Cash Flow. Factoring related interest expense is recorded to interest and other income (loss), net on the Consolidated Statements of Operations. See Note 9 below. Research and Development Ciena charges all research and development costs to expense as incurred. Types of expense incurred in research and development include employee compensation, prototype equipment, consulting and third-party services, depreciation, facility costs and information technology. Government Grants Ciena accounts for proceeds from government grants as a reduction of expense when there is reasonable assurance that Ciena has met the required conditions associated with the grant and that grant proceeds will be received. Grant benefits are recorded to the particular line item of the Consolidated Statement of Operations to which the grant activity relates. See Notes 3 below. Advertising Costs Ciena expenses all advertising costs as incurred. Legal Costs Ciena expenses legal costs associated with litigation as incurred. Share-Based Compensation Expense Ciena measures and recognizes compensation expense for share-based awards and employee stock purchases related to its Amended and Restated 2003 Employee Stock Purchase Plan (the “ESPP”) based on estimated fair values on the date of grant. Ciena estimates the fair value of employee stock purchases related to the ESPP using the Black-Scholes option-pricing model. Ciena recognizes the estimated fair value of restricted stock units subject only to service-based vesting conditions by multiplying the number of shares underlying the award by the closing price per share of Ciena common stock on the grant date. In each case, Ciena only recognizes expense in its Consolidated Statements of Operations for those restricted stock units that ultimately vest. Awards with performance-based vesting conditions (i) require the achievement of certain operational, financial or other performance criteria or targets or (ii) vest based on Ciena’s total stockholder return as compared to an index of peer companies, in whole or in part. Ciena recognizes the estimated fair value of restricted stock units subject to performance-based vesting conditions other than total stockholder return by assuming the satisfaction of any performance-based objectives at the “target” level and multiplying the corresponding number of shares earned based upon such achievement by the closing price per share of Ciena common stock on the grant date. Ciena recognizes the estimated fair value of performance based awards subject to total stockholder return as compared to an index of peer companies using a Monte Carlo simulation valuation model on the date of grant. At the end of each reporting period, Ciena reassesses the probability of achieving the performance targets and the performance period required to meet those targets. See Note 24 below. Stock Repurchase Program Shares repurchased pursuant to Ciena’s stock repurchase program are immediately retired upon purchase. Repurchased common stock is reflected as a reduction of stockholders’ equity. Ciena’s accounting policy related to its share repurchases is to reduce its common stock based on the par value of the shares and to reduce its capital surplus for the excess of the repurchase price over the par value. Since the inception of its stock repurchase programs, Ciena has had an accumulated deficit balance; therefore, the excess over the par value has been applied to additional paid-in capital. Once Ciena has retained earnings, the excess will be charged entirely to retained earnings. Income Taxes Ciena accounts for income taxes using an asset and liability approach. This approach recognizes deferred tax assets and liabilities (“DTA”) for the expected future tax consequences attributable to differences between the carrying amounts of assets and liabilities for financial reporting purposes and their respective tax bases, and for operating loss and tax credit carryforwards. In estimating future tax consequences, Ciena considers all expected future events other than the enactment of changes in tax laws or rates. Valuation allowances are provided if, based on the weight of the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. In the ordinary course of business, transactions occur for which the ultimate outcome may be uncertain. In addition, tax authorities periodically audit Ciena’s income tax returns. These audits examine significant tax filing positions, including the timing and amounts of deductions and the allocation of income tax expenses among tax jurisdictions. Ciena is currently under audit in India for 2018 through 2021, in Canada for 2014, and in the United Kingdom for 2016 through 2021. Management does not expect the outcome of these audits to have a material adverse effect on Ciena’s consolidated financial position, results of operations or cash flows. Ciena’s major tax jurisdictions and the earliest open tax years are as follows: United States (2020), United Kingdom (2016), Canada (2014), and India (2018). Limited adjustments can be made to federal U.S. tax returns in earlier years in order to reduce net operating loss carryforwards. Ciena classifies interest and penalties related to uncertain tax positions as a component of income tax expense. Ciena is required to record excess tax benefits or tax deficiencies related to stock-based compensation as income tax benefit or expense when share-based awards vest or are settled. The Tax Cuts and Jobs Act (the “Tax Act”) includes provisions that affected Ciena starting in fiscal 2019, including a provision designed to tax global intangible low-taxed income (“GILTI”). An accounting policy choice is allowed to either treat taxes due on future U.S. inclusions related to GILTI in taxable income as a current-period expense when incurred (the “period cost method”) or factor such amounts into the measurement of deferr

REVENUE

REVENUE	12 Months Ended
	Oct. 28, 2023
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. Effective as of the fourth quarter of fiscal 2023, Ciena renamed its “Converged Packet Optical” product line to “Optical Networking.” This change, affecting only the presentation of such information, was made on a prospective basis and does not impact comparability of previous financial results. However, references to prior reported “Converged Packet Optical” product line have been changed herein to “Optical Networking.” The tables below set forth Ciena’s disaggregated revenue for the respective period (in thousands): Year Ended October 28, 2023 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Optical Networking $ 2,987,245 $ — $ — $ — $ 2,987,245 Routing and Switching 506,247 — — — 506,247 Platform Software and Services — 303,873 — — 303,873 Blue Planet Automation Software and Services — — 69,170 — 69,170 Maintenance Support and Training — — — 288,334 288,334 Installation and Deployment — — — 180,951 180,951 Consulting and Network Design — — — 50,729 50,729 Total revenue by product line $ 3,493,492 $ 303,873 $ 69,170 $ 520,014 $ 4,386,549 Timing of revenue recognition: Products and services at a point in time $ 3,493,492 $ 67,013 $ 21,842 $ 55,036 $ 3,637,383 Products and services transferred over time — 236,860 47,328 464,978 749,166 Total revenue by timing of revenue recognition $ 3,493,492 $ 303,873 $ 69,170 $ 520,014 $ 4,386,549 Year Ended October 29, 2022 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Optical Networking $ 2,379,931 $ — $ — $ — $ 2,379,931 Routing and Switching 398,439 — — — 398,439 Platform Software and Services — 277,191 — — 277,191 Blue Planet Automation Software and Services — — 76,567 — 76,567 Maintenance Support and Training — — — 292,375 292,375 Installation and Deployment — — — 157,443 157,443 Consulting and Network Design — — — 50,715 50,715 Total revenue by product line $ 2,778,370 $ 277,191 $ 76,567 $ 500,533 $ 3,632,661 Timing of revenue recognition: Products and services at a point in time $ 2,778,370 $ 85,691 $ 25,540 $ 44,091 $ 2,933,692 Products and services transferred over time — 191,500 51,027 456,442 698,969 Total revenue by timing of revenue recognition $ 2,778,370 $ 277,191 $ 76,567 $ 500,533 $ 3,632,661 Year Ended October 30, 2021 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Optical Networking $ 2,553,509 $ — $ — $ — $ 2,553,509 Routing and Switching 271,796 — — — 271,796 Platform Software and Services — 229,588 — — 229,588 Blue Planet Automation Software and Services — — 77,247 — 77,247 Maintenance Support and Training — — — 283,350 283,350 Installation and Deployment — — — 171,489 171,489 Consulting and Network Design — — — 33,705 33,705 Total revenue by product line $ 2,825,305 $ 229,588 $ 77,247 $ 488,544 $ 3,620,684 Timing of revenue recognition: Products and services at a point in time $ 2,825,305 $ 80,359 $ 27,621 $ 14,923 $ 2,948,208 Products and services transferred over time — 149,229 49,626 473,621 672,476 Total revenue by timing of revenue recognition $ 2,825,305 $ 229,588 $ 77,247 $ 488,544 $ 3,620,684 Ciena reports its sales geographically around 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 principally based on the relevant location for Ciena’s delivery of products and performance of services. For the periods below, Ciena’s geographic distribution of revenue was as follows (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Geographic distribution: Americas $ 3,110,347 $ 2,636,840 $ 2,525,619 EMEA 643,142 555,215 670,462 APAC 633,060 440,606 424,603 Total revenue by geographic distribution $ 4,386,549 $ 3,632,661 $ 3,620,684 Ciena’s revenue includes United States revenue of $2.8 billion for fiscal 2023, $2.4 billion for fiscal 2022 and $2.3 billion for fiscal 2021. 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): October 28, 2023 October 29, 2022 October 30, 2021 Cloud Provider $ 561,397 n/a n/a AT&T 464,662 $ 433,418 $ 447,403 Verizon n/a 402,787 n/a Total $ 1,026,059 $ 836,205 $ 447,403 ________________________________ n/a Denotes revenue representing less than 10% of total revenue for the period The cloud provider noted in the above table purchased products from each of Ciena’s operating segments, excluding Blue Planet ® Automation Software and Services, for each of the periods presented. The other customers identified above purchased products and services from each of Ciena’s operating segments for each of the periods presented. While Ciena has benefited from the diversification of its business and customer base, its ten largest customers contributed 53.7% of fiscal 2023 revenue, 56.3% of fiscal 2022 revenue and 55.5% of fiscal 2021 revenue. ◦ 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, from our recent acquisitions of Benu Networks, Inc. (“Benu”) and Tibit Communications, Inc. (“Tibit”) respectively, during the first quarter of fiscal 2023. This product line also includes Ciena’s WaveRouter TM product, which was introduced during the second quarter of fiscal 2023, for which there have been no 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 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 more proactive visibility into their networks. Ciena’s platform software includes its MCP domain controller solution, its suite of MCP applications, and its OneControl Unified Management System, as well as planning tools and a number of legacy software solutions that support Ciena’s installed base of network solutions. Platform software-related services revenue includes sales of subscription, installation, support, and consulting services related to Ciena’s software platforms, operating system software and enhanced software features embedded in each of the Networking Platforms product lines above. Revenue from the software portion of this segment is included in product revenue on the Consolidated Statements of Operations. Revenue from services portions of this segment is included in services revenue on the 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 Consolidated Statements of Operations. Revenue from services portions of this segment is included in services revenue on the 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 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 October 28, 2023 Balance at October 29, 2022 Accounts receivable, net $ 1,003,876 $ 920,772 Contract assets for unbilled accounts receivable, net $ 150,312 $ 156,039 Deferred revenue $ 228,460 $ 200,235 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 in the Consolidated Balance Sheets. See Note 11 below. Contract liabilities consist of deferred revenue and represent advanced payments received from customers against non-cancelable customer orders received prior to revenue recognition. Ciena recognized approximately $135.5 million and $111.3 million of revenue during fiscal 2023 and 2022, 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 fiscal 2023 and 2022. Capitalized Contract Acquisition Costs Capitalized contract acquisition costs consist of deferred sales commissions and were $30.2 million and $39.7 million as of October 28, 2023 and October 29, 2022 , respectively, and are included in (i) prepaid expenses and other and (ii) other long-term assets. The amortization expense associated with these costs was $34.2 million and $27.3 million during fiscal 2023 and fiscal 2022, respectively, and are included in selling and marketing expense on the Consolidated Statements of Operations. Remaining Performance Obligations

CANADIAN EMERGENCY WAGE SUBSIDY

CANADIAN EMERGENCY WAGE SUBSIDY	12 Months Ended
	Oct. 28, 2023
Unusual or Infrequent Items, or Both [Abstract]
CANADIAN EMERGENCY WAGE SUBSIDY	CANADIAN EMERGENCY WAGE SUBSIDY In April 2020, the Canadian government introduced the Canada Emergency Wage Subsidy (“CEWS”) to help employers offset a portion of their employee wages for a limited period in response to the COVID-19 outbreak, retroactive to March 15, 2020. The CEWS program expired in October 2021. The subsidy covered employers of all sizes and across all sectors. Ciena accounts for proceeds from government grants as a reduction of expense when there is reasonable assurance that Ciena has met the required conditions associated with the grant and that grant proceeds will be received. Grant benefits are recorded to the particular line item of the Consolidated Statements of Operations to which the grant activity relates. Amounts from the CEWS program positively impacted Ciena’s operating expense and measures of profit in the year ended October 30, 2021. For the fiscal year ended October 30, 2021 , Ciena recorded a CAD$52.2 million ($41.3 million) benefit, net of certain fees, related to CEWS for claim periods beginning March 15, 2020, including CAD$43.9 million ($35.4 million) related to employee wages during fiscal 2020. There was no CEWS activity in fiscal 2023 or 2022. The following table summarizes CEWS for the period indicated (in thousands): Year Ended October 30, 2021 Product $ 4,283 Service 2,667 CEWS benefit in cost of goods sold 6,950 Research and development 29,519 Sales and marketing 2,604 General and administrative 2,207 CEWS benefit in operating expense 34,330 Total CEWS benefit $ 41,280

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS	12 Months Ended
	Oct. 28, 2023
Business Combination and Asset Acquisition [Abstract]
BUSINESS COMBINATIONS	BUSINESS COMBINATIONS Fiscal 2023 Acquisitions: Benu and Tibit On November 17, 2022, Ciena acquired Benu, a portfolio of cloud-native software solutions, including a virtual Broadband Network Gateway ((v)BNG), that complements Ciena’s existing portfolio of broadband access solutions. On December 30, 2022, Ciena acquired Tibit, a provider and developer of passive optical network (“PON”)-specific hardware and operating software that can be integrated into a carrier-grade Ethernet switch and will strengthen Ciena’s portfolio of next-generation PON solutions that support residential, enterprise, and mobility use cases. These businesses were acquired for an aggregate of approximately $291.7 million, of which $244.7 million was paid in cash, and $47.0 million represents the fair value of Ciena’s previously held cost method equity investment in Tibit. The acquisition of Tibit 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. Each of these transactions has been accounted for as the acquisition of a business. Ciena incurred approximately $3.4 million in acquisition-related costs associated with these acquisitions. These costs and expenses primarily include fees associated with financial, legal, and accounting advisors and employment-related costs. These costs were recorded in acquisition and integration costs on the Consolidated Statements of Operations. The following table summarizes the final purchase price allocation related to the acquisitions based on the estimated fair value of the acquired assets and assumed liabilities (in thousands): Amount Cash and cash equivalents $ 14,634 Accounts receivable, net 443 Inventories, net 1,406 Prepaid expenses and other 810 Equipment, furniture and fixtures 1,090 Goodwill 116,644 Developed technology 75,400 In-process technology 89,100 Customer relationships and contracts 18,400 Order backlog 2,480 Deferred tax asset, net (26,429) Accounts payable (420) Accrued liabilities and other short-term obligations (874) Deferred revenue (851) Other long-term obligations (144) Total purchase consideration $ 291,689 Developed technology represents purchased technology that has reached technological feasibility and for which the acquired companies had substantially completed development as of the date of acquisition. Fair value was determined using future discounted cash flows related to the projected income stream of the developed technology for a discrete projection period. Cash flows were discounted to their present value as of the closing date. Developed technology is amortized on a straight-line basis over its estimated useful life of five years. In-process technology represents purchased technology that had not reached technological feasibility as of the date of acquisition. Fair value was determined using future discounted cash flows related to the projected income stream of the in-process technology for a discrete projection period. Cash flows were discounted to their present value as of the closing date. Upon completion of the in-process technology, it will be amortized on a straight line basis over its estimated useful life, which will be determined on that date. Customer relationships and contracts represent agreements with existing Tibit customers and have an estimated useful life of three years. Order backlog is amortized over the fulfillment period. The goodwill generated from these acquisitions is primarily related to expected economic synergies. The total goodwill amount was recorded in the Networking Platforms segment. The goodwill is not deductible for income tax purposes. Pro forma disclosures have not been included due to immateriality. The amounts of revenue and earnings for these acquisitions since the acquisition dates, which are included on the Consolidated Statements of Operations for the reporting period, are immaterial. Fiscal 2022 Acquisitions: Vyatta and Xelic On November 1, 2021, Ciena acquired AT&T’s Vyatta Software Technology (“Vyatta”), a provider of software-based virtual routing and switching technology. AT&T is a customer of Ciena; see Note 2 above. On March 9, 2022, Ciena acquired Xelic, Inc., a provider and developer of field programmable gate array (FPGA) and application-specific integrated circuit (ASIC) technology and optical networking IP cores. These businesses were acquired for an aggregate of approximately $64.1 million, of which $63.3 million was paid in cash and $0.8 million represents a future payable arrangement. These transactions have each been accounted for as the acquisition of a business. Ciena incurred approximately $1.7 million in acquisition-related costs associated with these acquisitions. These costs and expenses primarily include fees associated with financial, legal and accounting advisors. These costs were recorded in acquisition and integration costs in the Consolidated Statements of Operations. The following table summarizes the final purchase price allocation related to the acquisitions based on the estimated fair value of the acquired assets and assumed liabilities (in thousands): Amount Cash and cash equivalents $ 201 Prepaid expenses and other 1,614 Equipment, furniture and fixtures 694 Customer relationships and contracts 15,800 Developed technology 32,491 Goodwill 17,698 Accrued liabilities (4,434) Total purchase consideration $ 64,064 Customer relationships and contracts represent agreements with existing Vyatta customers and have an estimated useful life of two years. Developed technology represents purchased technology that has reached technological feasibility and for which the acquired companies had substantially completed development as of the date of acquisition. Fair value was determined using future discounted cash flows related to the projected income stream of the developed technology for a discrete projection period. Cash flows were discounted to their present value as of the closing date. Developed technology is amortized on a straight-line basis over its estimated useful life of five years. The goodwill generated from these acquisitions are primarily related to expected economic synergies. The total goodwill amount was recorded in the Networking Platforms segment. The goodwill is not deductible for income tax purposes. Pro forma disclosures have not been included due to immateriality. The amounts of revenue and earnings for these acquisitions since the acquisition dates, which are included in the Consolidated Statements of Operations for the reporting period, are immaterial.

SIGNIFICANT ASSET IMPAIRMENT AN

SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS	12 Months Ended
	Oct. 28, 2023
Restructuring and Related Activities [Abstract]
SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS	SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS Ciena has undertaken a number of restructuring activities intended to reduce expense and align its workforce and costs with market opportunities, product development and business strategies. The following table sets forth the restructuring activity and balance of the restructuring liability accounts, which are included in accrued liabilities and other short-term obligations on Ciena’s Consolidated Balance Sheets, for the fiscal years indicated (in thousands): Workforce Other restructuring activities Total Balance at October 31, 2020 $ 2,915 $ — $ 2,915 Charges 5,938 (1) 23,627 (2) 29,565 Cash payments (8,072) (23,627) (31,699) Balance at October 30, 2021 781 — 781 Charges 3,156 (1) 26,814 (2) 29,970 Cash payments (2,722) (22,194) (24,916) Balance at October 29, 2022 1,215 4,620 5,835 Charges 6,885 (1) 16,949 (2) 23,834 Cash payments (6,187) (21,569) (27,756) Balance at October 28, 2023 $ 1,913 $ — $ 1,913 Current restructuring liabilities $ 1,913 $ — $ 1,913 _________________________________ (1) Reflects employee costs associated with workforce reductions 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. Significant Asset Impairments In February 2022, armed conflict escalated between Russia and Ukraine. The United States and certain other countries have imposed sanctions on Russia and could impose further sanctions. On March 7, 2022, Ciena announced its decision to suspend its business operations in Russia immediately. As a result, Ciena recorded impairment charges of approximately $3.8 million of which $1.8 million was a provision for credit losses.

INTEREST AND OTHER INCOME (LOSS

INTEREST AND OTHER INCOME (LOSS), NET	12 Months Ended
	Oct. 28, 2023
Other Income and Expenses [Abstract]
INTEREST AND OTHER INCOME (LOSS), NET	INTEREST AND OTHER INCOME (LOSS), NET The components of interest and other income (loss), net, were as follows (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Interest income $ 45,011 $ 10,060 $ 2,051 Gains (losses) on non-hedge designated foreign currency forward contracts (3,896) (4,018) 11,172 Foreign currency exchange gains (losses) (427) 2,501 (14,622) Gain on cost method equity investments, net 26,368 4,120 164 Other (5,048) (5,916) (533) Interest and other income (loss), net $ 62,008 $ 6,747 $ (1,768) During the first quarter of fiscal 2023, the acquisition of Tibit 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. See Note 4 above. During fiscal 2023 and fiscal 2022, Ciena recorded a net gain of $26.4 million and $4.1 million, respectively, on its cost method equity investments.

CASH EQUIVALENT, SHORT-TERM AND

CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS	12 Months Ended
	Oct. 28, 2023
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 classified as available-for-sale are comprised of the following (in thousands): 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 October 29, 2022 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations $ 137,963 $ — $ (3,379) $ 134,584 Corporate debt securities 54,899 1 (405) 54,495 Time deposits 55,889 — (64) 55,825 $ 248,751 $ 1 $ (3,848) $ 244,904 Included in cash equivalents $ 55,530 $ — $ — $ 55,530 Included in short-term investments 156,430 1 (2,442) 153,989 Included in long-term investments 36,791 — (1,406) 35,385 $ 248,751 $ 1 $ (3,848) $ 244,904 The following table summarizes the legal maturities of debt investments at October 28, 2023 (in thousands): October 28, 2023 Amortized Cost Estimated Fair Less than one year $ 234,318 $ 234,029 Due in 1-2 years 134,455 134,278 $ 368,773 $ 368,307

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Oct. 28, 2023
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS As of the dates indicated, the following tables summarize the fair value of assets and liabilities that were recorded at fair value on a recurring basis (in thousands): 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 October 29, 2022 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 639,024 $ — $ — $ 639,024 Bond mutual fund 71,145 — — 71,145 Time deposits 55,825 — — 55,825 Deferred compensation plan assets 12,751 — — 12,751 U.S. government obligations — 134,584 — 134,584 Commercial paper — 54,495 — 54,495 Foreign currency forward contracts — 251 — 251 Interest rate swaps — 12,306 — 12,306 Total assets measured at fair value $ 778,745 $ 201,636 $ — $ 980,381 Liabilities: Foreign currency forward contracts $ — $ 15,605 $ — $ 15,605 Total liabilities measured at fair value $ — $ 15,605 $ — $ 15,605 As of the dates indicated, the assets and liabilities above were presented on Ciena’s Consolidated Balance Sheets as follows (in thousands): 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 October 29, 2022 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 757,725 $ 7,974 $ — $ 765,699 Short-term investments 8,269 145,720 — 153,989 Prepaid expenses and other — 251 — 251 Long-term investments — 35,385 — 35,385 Other long-term assets 12,751 12,306 — 25,057 Total assets measured at fair value $ 778,745 $ 201,636 $ — $ 980,381 Liabilities: Accrued liabilities and other short-term obligations $ — $ 15,605 $ — $ 15,605 Total liabilities measured at fair value $ — $ 15,605 $ — $ 15,605 Ciena did not have any transfers between Level 1 and Level 2 fair value measurements during the periods presented.

ACCOUNTS RECEIVABLE

ACCOUNTS RECEIVABLE	12 Months Ended
	Oct. 28, 2023
Receivables [Abstract]
ACCOUNTS RECEIVABLE	ACCOUNTS RECEIVABLE As of October 28, 2023 , two customers accounted for 11.0% and 10.0% of net accounts receivable, respectively. As of October 29, 2022 , two customers accounted for 13.0% and 11.0% of net accounts receivable, respectively. Ciena has not historically experienced a significant amount of bad debt expense. The following table summarizes the activity in Ciena’s allowance for credit losses for the fiscal years indicated (in thousands): Year Ended Beginning Balance Effect of adoption of new accounting standard Provisions Net Deductions Ending Balance October 30, 2021 $ 10,598 $ 2,206 $ 2,346 $ 4,238 $ 10,912 October 29, 2022 (1) $ 10,912 $ — $ 4,199 $ 4,153 $ 10,958 October 28, 2023 $ 10,958 $ — $ 5,718 $ 5,022 $ 11,654 (1) On March 7, 2022, Ciena announced its decision to suspend its business operations in Russia immediately. As a result, Ciena’s allowance for doubtful accounts includes a provision for a significant asset impairment of $1.8 million for a trade receivable related to this decision. Accounts Receivable Factoring

INVENTORIES

INVENTORIES	12 Months Ended
	Oct. 28, 2023
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES As of the dates indicated, inventories are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Raw materials $ 664,797 $ 664,916 Work-in-process 55,242 18,232 Finished goods 314,168 258,584 Deferred cost of goods sold 66,634 41,084 Gross inventories 1,100,841 982,816 Reserve for excess and obsolescence (50,003) (36,086) Inventories, net $ 1,050,838 $ 946,730 Ciena has been expanding its manufacturing capacity and 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 when supply constraints ease for certain common components, including integrated circuit components, for which delivery continues to be delayed. Raw materials inventory is related to the steps Ciena has taken to mitigate the impact of supply chain constraints on its business and customers in recent prior periods and the global market shortage of semiconductor parts. The increase in finished goods inventories resulted primarily from planned fulfillment of customer advance orders for which some deliveries have been rescheduled outside of fiscal 2023. Ciena makes estimates about future customer demand for its products when establishing the appropriate reserve for excess and obsolete inventory. For fiscal 2023, future demand was calculated using both customer backlog and future forecasted sales. For fiscal 2022, future demand was calculated primarily based on customer backlog. 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 fiscal 2023, fiscal 2022 and fiscal 2021, Ciena recorded a provision for excess and obsolescence of $29.5 million, $16.2 million, and $17.9 million, respectively, 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 the sale of previously reserved items and disposal activities. The following table summarizes the activity in Ciena’s reserve for excess and obsolete inventory for the fiscal years indicated (in thousands): Year Ended Beginning Balance Provisions Disposals Ending Balance October 30, 2021 $ 39,637 $ 17,850 $ 20,528 $ 36,959 October 29, 2022 $ 36,959 $ 16,184 $ 17,057 $ 36,086 October 28, 2023 $ 36,086 $ 29,464 $ 15,547 $ 50,003

PREPAID EXPENSES AND OTHER

PREPAID EXPENSES AND OTHER	12 Months Ended
	Oct. 28, 2023
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): October 28, 2023 October 29, 2022 Contract assets for unbilled accounts receivable, net $ 150,312 $ 156,039 Prepaid VAT and other taxes 96,724 63,975 Prepaid expenses 58,954 55,440 Product demonstration equipment, net 40,682 35,929 Capitalized contract acquisition costs 23,326 33,516 Other non-trade receivables 33,408 24,026 Deferred deployment expense 1,170 877 Derivative assets 1,118 251 $ 405,694 $ 370,053 Depreciation of product demonstration equipment was $8.0 million, $8.7 million and $9.8 million for fiscal 2023, 2022 and 2021, respectively. For further discussion on contract assets and capitalized contract acquisition costs, see Note 2 above.

EQUIPMENT, BUILDING, FURNITURE

EQUIPMENT, BUILDING, FURNITURE AND FIXTURES	12 Months Ended
	Oct. 28, 2023
Property, Plant and Equipment [Abstract]
EQUIPMENT, BUILDING, FURNITURE AND FIXTURES	EQUIPMENT, BUILDING, FURNITURE AND FIXTURES As of the dates indicated, equipment, building, furniture and fixtures are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Equipment, furniture and fixtures $ 676,485 $ 619,160 Building subject to finance lease 67,904 69,247 Leasehold improvements 74,391 80,415 Equipment, building, furniture and fixtures 818,780 768,822 Accumulated depreciation and amortization (538,633) (501,043) Equipment, building, furniture and fixtures, net $ 280,147 $ 267,779

INTANGIBLE ASSETS

INTANGIBLE ASSETS	12 Months Ended
	Oct. 28, 2023
Intangible Assets, Net (Excluding Goodwill) [Abstract]
INTANGIBLE ASSETS	INTANGIBLE ASSETS As of the dates indicated, intangible assets are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Gross Accumulated Net Gross Accumulated Net Developed technology $ 503,618 $ (414,941) $ 88,677 $ 428,218 $ (386,300) $ 41,918 In-process research and development 89,100 — 89,100 — — — Patents and licenses 8,795 (5,203) 3,592 8,415 (4,228) 4,187 Customer relationships, covenants not to compete, outstanding purchase orders and contracts 410,983 (386,725) 24,258 390,271 (366,859) 23,412 Total intangible assets $ 1,012,496 $ (806,869) $ 205,627 $ 826,904 $ (757,387) $ 69,517 The aggregate amortization expense of intangible assets was $49.6 million, $44.3 million and $36.0 million for fiscal 2023, fiscal 2022 and fiscal 2021, respectively. Expected future amortization of intangible assets for the fiscal years indicated is as follows (in thousands): Fiscal Year Amount 2024 $ 40,601 2025 34,582 2026 23,348 2027 15,843 2028 1,991 Thereafter 162 (1) $ 116,527 (1) Does not include amortization of in-process technology, as estimation of the timing of future amortization expense would be impractical.

GOODWILL

GOODWILL	12 Months Ended
	Oct. 28, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL	GOODWILL The following table presents the goodwill allocated to Ciena’s operating segments as of October 28, 2023 and October 29, 2022 , as well as the changes to goodwill during fiscal 2023 (in thousands): Balance at October 29, 2022 Acquisitions Translation Balance at October 28, 2023 Platform Software and Services $ 156,191 $ — $ — $ 156,191 Blue Planet Automation Software and Services 89,049 — — 89,049 Networking Platforms 83,082 116,644 (201) 199,525 Total $ 328,322 $ 116,644 $ (201) $ 444,765

OTHER BALANCE SHEET DETAILS

OTHER BALANCE SHEET DETAILS	12 Months Ended
	Oct. 28, 2023
Balance Sheet Related Disclosures [Abstract]
OTHER BALANCE SHEET DETAILS	OTHER BALANCE SHEET DETAILS As of the dates indicated, other long-term assets are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Maintenance spares inventory, net $ 54,042 $ 44,815 Interest rate swaps 24,953 12,306 Deferred compensation plan assets 11,456 12,751 Cloud computing arrangements (1) 8,589 6,050 Capitalized contract acquisition costs 6,879 6,151 Deferred debt issuance costs, net (2) 1,956 781 Restricted cash 168 26 Cost method equity investments (3) 48 20,698 Other 8,362 10,039 $ 116,453 $ 113,617 (1) During fiscal 2023, fiscal 2022 and fiscal 2021, Ciena recorded amortization of cloud computing arrangements of $2.6 million, $2.8 million and $2.4 million, respectively. (2) Deferred debt issuance costs relate to Ciena’s senior secured revolving credit facility (the “Revolving Credit Facility”) entered into during fiscal 2023 and its predecessor asset-backed credit facility (described in Note 20 below). The amortization of deferred debt issuance costs for the Revolving Credit Facility and its predecessor is included in interest expense, and was $0.4 million for fiscal 2023, fiscal 2022 and fiscal 2021. (3) During the first quarter of fiscal 2023, Ciena acquired its previously held cost method equity investment in Tibit in a business combination, see Note 4 above. As of the dates indicated, accrued liabilities and other short-term obligations are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Compensation, payroll related tax and benefits (1) $ 159,530 $ 126,338 Warranty 57,089 45,503 Vacation 29,503 26,396 Income taxes payable 16,341 11,472 Foreign currency forward contracts 14,509 15,604 Interest payable 4,514 4,793 Finance lease liabilities 3,953 3,758 Other 145,980 126,918 $ 431,419 $ 360,782 (1) Increase is primarily due to a higher accrual rate related to Ciena’s 2023 annual cash incentive compensation plan. The following table summarizes the activity in Ciena’s accrued warranty for the fiscal years indicated (in thousands): Year Ended Beginning Balance Current Year Provisions Settlements Ending Balance October 30, 2021 $ 49,868 $ 17,093 $ (18,942) $ 48,019 October 29, 2022 $ 48,019 $ 17,440 $ (19,956) $ 45,503 October 28, 2023 $ 45,503 $ 31,742 $ (20,156) $ 57,089 As of the dates indicated, deferred revenue is comprised of the following (in thousands): October 28, 2023 October 29, 2022 Products $ 28,353 $ 19,814 Services 200,107 180,421 Total deferred revenue 228,460 200,235 Less current portion (154,419) (137,899) Long-term deferred revenue $ 74,041 $ 62,336 As of the dates indicated, other long-term obligations are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Finance lease liabilities $ 48,192 $ 53,176 Income tax liability 98,259 72,644 Deferred compensation plan liability 11,444 12,535 Other 12,512 11,980 $ 170,407 $ 150,335

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS	12 Months Ended
	Oct. 28, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS	DERIVATIVE INSTRUMENTS Foreign Currency Derivatives Ciena conducts business globally in many currencies, and thus is exposed to adverse foreign currency exchange rate changes. To limit this exposure, Ciena entered into foreign currency contracts. Ciena does not enter into such contracts for speculative purposes. As of October 28, 2023 and October 29, 2022, Ciena had forward contracts to hedge its foreign exchange exposure in order to reduce variability that is principally related to research and development activities. The notional amount of these contracts was approximately $367.3 million and $272.2 million as of October 28, 2023 and October 29, 2022, respectively. These foreign exchange contracts have maturities of 24 months or less and have been designated as cash flow hedges. In May 2023, Ciena entered into 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 $48.0 million as of October 28, 2023 . These foreign exchange contracts have maturities of 24 months or less and have been designated as net investment hedges. As of October 28, 2023 and October 29, 2022, Ciena had forward contracts to hedge its foreign exchange exposure in order to reduce the variability in various currencies of certain balance sheet items. The notional amount of these contracts was approximately $226.3 million and $108.0 million as of October 28, 2023 and October 29, 2022, 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 19 below) and has hedged such risk by entering into floating-to-fixed interest rate swap arrangements (“interest rate swaps”). Prior to amending our term loan due September 28, 2025 (the “2025 Term Loan”) in January 2023, to replace LIBOR with the Secured Overnight Financing Rate (“SOFR”), Ciena was exposed to floating rates of LIBOR interest on its 2025 Term Loan borrowings. In October 2018, Ciena hedged this risk by entering into interest rate swaps to fix the LIBOR rate for the first $350.0 million of its floating rate debt at 2.957% through September 2023. In January 2023, Ciena entered into a LIBOR to SOFR basis swap (“basis swap”) to hedge its exposure to SOFR rate. The basis swap offset the LIBOR exposure risk of the interest rate swaps and effectively fixed the SOFR rate for the first $350.0 million of its floating rate debt at 2.883% through September 2023. These swaps expired in September 2023. In April 2022, Ciena entered into forward starting interest rate swaps to fix the SOFR rate for the first $350.0 million 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 October 28, 2023. In January 2023, Ciena entered into interest rate swaps to fix the SOFR rate 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 the 2028 interest rate swaps in effect as of October 28, 2023 was $350.0 million. Ciena expects the variable rate payments to be received under the terms 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 19 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 Notes 6 and 8 above.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	12 Months Ended
	Oct. 28, 2023
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table summarizes the changes in accumulated balances of other comprehensive income (“AOCI”), net of tax (in thousands): Unrealized Gain (Loss) on Available-for-Sale Securities Foreign Interest Rate Swaps Cumulative Translation Adjustment Total Balance at October 31, 2020 $ 45 $ (219) $ (21,535) $ (13,649) $ (35,358) Other comprehensive gain (loss) before reclassifications (209) 16,856 (261) 20,215 36,601 Amounts reclassified from AOCI — (10,421) 9,617 — (804) Balance at October 30, 2021 (164) 6,216 (12,179) 6,566 439 Other comprehensive gain (loss) before reclassifications (2,801) (16,299) 14,512 (49,446) (54,034) Amounts reclassified from AOCI — (114) 7,064 — 6,950 Balance at October 29, 2022 (2,965) (10,197) 9,397 (42,880) (46,645) Other comprehensive gain (loss) before reclassifications 2,593 (8,455) 19,600 (5,321) 8,417 Amounts reclassified from AOCI — 10,496 (10,035) — 461 Balance at October 28, 2023 $ (372) $ (8,156) $ 18,962 $ (48,201) $ (37,767) 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 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 (loss), net on the Consolidated Statements of Operations.

LEASES

LEASES	12 Months Ended
	Oct. 28, 2023
Leases [Abstract]
LEASES	LEASES Ciena leases over 1.1 million square feet of facilities globally. Ciena’s corporate headquarters are located in Hanover, Maryland. Ciena’s largest facilities are research and development centers located in Ottawa, Canada and Gurgaon, India. Ciena also leases smaller engineering facilities in the United States, Canada, and Europe. In addition, Ciena leases various smaller offices in regions throughout the world to support sales and services operations. Office facilities are leased under various non-cancelable operating or finance leases. Ciena's current leases have remaining terms that vary up to 9 years. Certain leases provide for options to extend up to 10 years and/or options to terminate within 4 years. Leases included in the Consolidated Balance Sheets for the fiscal periods indicated were as follows (in thousands): Classification Balance at October 28, 2023 Balance at October 29, 2022 Operating leases: Operating ROU Assets Operating right-of-use assets $ 35,140 $ 45,108 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities $ 49,914 $ 61,317 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 67,904 $ 69,247 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (30,079) (26,266) Buildings, net $ 37,825 $ 42,981 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 52,145 $ 56,934 ROU assets that involve subleased or vacant space aggregate $7.5 million as of October 28, 2023 . Finance lease buildings, net, that involve subleased or vacant space aggregate $6.0 million as of October 28, 2023. These assets may become impaired if tenants are unable to service their obligations under the sublease, and/or if the estimates as to occupancy are not realized. For the periods indicated, the components of lease expense included in the Consolidated Statements of Operations were as follows (in thousands): Year Ended Year Ended Year Ended Classification October 28, 2023 October 29, 2022 October 30, 2021 Operating lease costs Operating expense $ 16,080 $ 17,966 $ 16,602 Finance lease cost: Amortization of finance ROU asset Operating expense 4,448 4,592 4,773 Interest on finance lease liabilities Interest expense 4,069 4,601 4,882 Total finance lease cost 8,517 9,193 9,655 Non-capitalized lease cost Operating expense 910 917 1,152 Variable lease cost (1) Operating expense 3,421 5,898 5,690 Net lease cost (2) $ 28,928 $ 33,974 $ 33,099 (1) Variable lease costs include expenses relating to insurance, taxes, maintenance and other costs required by the applicable operating lease. Variable lease costs are determined by whether they are to be included in base rent and if amounts are based on a consumer price index. (2) Excludes other operating expense of $6.5 million, $12.8 million, and $8.8 million for the fiscal years ended October 28, 2023, October 29, 2022 , and October 30, 2021, respectively, related to amortization of leasehold improvements. Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of October 28, 2023 were as follows (in thousands): Operating Leases Finance Leases Total 2024 $ 18,126 $ 7,640 $ 25,766 2025 13,568 7,793 21,361 2026 9,951 7,824 17,775 2027 5,563 8,095 13,658 2028 1,516 8,367 9,883 Thereafter 5,796 31,435 37,231 Total lease payments 54,520 71,154 125,674 Less: Imputed interest (4,606) (19,009) (23,615) Present value of lease liabilities 49,914 52,145 102,059 Less: Current portion of present value of minimum lease payments 16,655 3,953 20,608 Long-term portion of present value of minimum lease payments $ 33,259 $ 48,192 $ 81,451 The weighted average remaining lease terms and weighted average discount rates for operating and finance leases were as follows (in thousands): Weighted-average remaining lease term in years: As of October 28, 2023 As of October 29, 2022 Operating leases 4.07 3.85 Finance leases 8.71 9.71 Weighted-average discount rates: Operating leases 3.88 % 2.97 % Finance leases 7.56 % 7.56 %
LEASES	LEASES Ciena leases over 1.1 million square feet of facilities globally. Ciena’s corporate headquarters are located in Hanover, Maryland. Ciena’s largest facilities are research and development centers located in Ottawa, Canada and Gurgaon, India. Ciena also leases smaller engineering facilities in the United States, Canada, and Europe. In addition, Ciena leases various smaller offices in regions throughout the world to support sales and services operations. Office facilities are leased under various non-cancelable operating or finance leases. Ciena's current leases have remaining terms that vary up to 9 years. Certain leases provide for options to extend up to 10 years and/or options to terminate within 4 years. Leases included in the Consolidated Balance Sheets for the fiscal periods indicated were as follows (in thousands): Classification Balance at October 28, 2023 Balance at October 29, 2022 Operating leases: Operating ROU Assets Operating right-of-use assets $ 35,140 $ 45,108 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities $ 49,914 $ 61,317 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 67,904 $ 69,247 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (30,079) (26,266) Buildings, net $ 37,825 $ 42,981 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 52,145 $ 56,934 ROU assets that involve subleased or vacant space aggregate $7.5 million as of October 28, 2023 . Finance lease buildings, net, that involve subleased or vacant space aggregate $6.0 million as of October 28, 2023. These assets may become impaired if tenants are unable to service their obligations under the sublease, and/or if the estimates as to occupancy are not realized. For the periods indicated, the components of lease expense included in the Consolidated Statements of Operations were as follows (in thousands): Year Ended Year Ended Year Ended Classification October 28, 2023 October 29, 2022 October 30, 2021 Operating lease costs Operating expense $ 16,080 $ 17,966 $ 16,602 Finance lease cost: Amortization of finance ROU asset Operating expense 4,448 4,592 4,773 Interest on finance lease liabilities Interest expense 4,069 4,601 4,882 Total finance lease cost 8,517 9,193 9,655 Non-capitalized lease cost Operating expense 910 917 1,152 Variable lease cost (1) Operating expense 3,421 5,898 5,690 Net lease cost (2) $ 28,928 $ 33,974 $ 33,099 (1) Variable lease costs include expenses relating to insurance, taxes, maintenance and other costs required by the applicable operating lease. Variable lease costs are determined by whether they are to be included in base rent and if amounts are based on a consumer price index. (2) Excludes other operating expense of $6.5 million, $12.8 million, and $8.8 million for the fiscal years ended October 28, 2023, October 29, 2022 , and October 30, 2021, respectively, related to amortization of leasehold improvements. Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of October 28, 2023 were as follows (in thousands): Operating Leases Finance Leases Total 2024 $ 18,126 $ 7,640 $ 25,766 2025 13,568 7,793 21,361 2026 9,951 7,824 17,775 2027 5,563 8,095 13,658 2028 1,516 8,367 9,883 Thereafter 5,796 31,435 37,231 Total lease payments 54,520 71,154 125,674 Less: Imputed interest (4,606) (19,009) (23,615) Present value of lease liabilities 49,914 52,145 102,059 Less: Current portion of present value of minimum lease payments 16,655 3,953 20,608 Long-term portion of present value of minimum lease payments $ 33,259 $ 48,192 $ 81,451 The weighted average remaining lease terms and weighted average discount rates for operating and finance leases were as follows (in thousands): Weighted-average remaining lease term in years: As of October 28, 2023 As of October 29, 2022 Operating leases 4.07 3.85 Finance leases 8.71 9.71 Weighted-average discount rates: Operating leases 3.88 % 2.97 % Finance leases 7.56 % 7.56 %

SHORT-TERM AND LONG-TERM DEBT

SHORT-TERM AND LONG-TERM DEBT	12 Months Ended
	Oct. 28, 2023
Debt Disclosure [Abstract]
SHORT-TERM AND LONG-TERM DEBT	SHORT-TERM AND LONG-TERM DEBT 2030 New Term Loan On October 24, 2023, Ciena, together with certain of its domestic subsidiaries as guarantors, entered into an Incremental Amendment Agreement (the “Amendment”) to its Credit Agreement, dated July 15, 2014, as amended (the “Credit Agreement”), by and among Ciena, certain of its subsidiaries, the lenders party thereto, and Bank of America, N.A., as administrative agent (“Bank of America”), to which Ciena incurred a new tranche of senior secured term loans in an aggregate principal amount of $1.2 billion (the “2030 New Term Loan”) and a new senior secured revolving credit facility of $300 million (the “Revolving Credit Facility” as defined in Note 20 below). The proceeds of the 2030 New Term Loan, net of original issuance discount, replaced, in full, $668.7 million of outstanding principal of the 2025 Term Loan and $497.5 million of outstanding principal of the 2030 Term Loan (as defined below) (“Refinanced Term Loans”), including accrued interest, and pay transaction fees and expenses, resulting in proceeds of $0.8 million. The 2030 New Term Loan requires Ciena to make installment payments of $2.9 million on a quarterly basis. Based on the continuation of existing lenders and the addition of new lenders, this arrangement was primarily accounted for as a modification of debt and, as such, $6.0 million of debt issuance costs associated with the 2030 New Term Loan were expensed. The aggregate balance of approximately $4.4 million of debt issuance costs and approximately $2.2 million of original discount from the 2025 Term Loan and 2030 Term Loan, $0.1 million of debt issuance costs associated with new lenders for the 2030 New Term Loan, and approximately $2.9 million of original discount from the 2030 New Term Loan, were included in the carrying value of the 2030 New Term Loan. The Amendment amends the Credit Agreement and provides that the 2030 New Term Loan will, among other things: • mature on October 24, 2030; • amortize in equal quarterly installments in aggregate amounts equal to 0.25% of the principal amount of the 2030 New Term Loan as of January 19, 2023, or $2.9 million, or $11.7 million annually, with the balance payable at maturity; • be subject to mandatory prepayment upon the occurrence of certain specified events substantially similar to the Refinanced Term Loans, including upon the occurrence of certain specified events such as asset sales, debt issuances, and receipt of annual Excess Cash Flow (as defined in the Credit Agreement); • bear interest, at Ciena’s election, at a per annum rate equal to (a) SOFR (subject to a floor of 0.00%) plus an applicable margin of 2.00%, or (b) a base rate (subject to a floor of 1.00%) plus an applicable margin of 1.00%; and • be repayable at any time at Ciena’s election, provided that repayment of the 2030 New Term Loan with proceeds of certain indebtedness prior to April 24, 2024 will require a prepayment premium of 1.00% of the aggregate principal amount of such prepayment. Among other things, the Amendment also amends the Credit Agreement by (i) modifying the “accordion” feature to provide for incremental term loan facilities (the “Incremental Term Loans”) in an aggregate amount not to exceed the sum of (A) the greater of (1) $640 million and (2) an amount equal to consolidated EBITDA on a pro forma basis for the most recently ended four-quarter period and (B) an amount (1) in the case of secured incremental term facilities that rank pari passu with or junior to the 2030 New Term Loan, such that the Total Secured Net Leverage Ratio (as defined in the Credit Agreement) would not be greater than 3.00 to 1.00 at the time of incurrence and (2) in the case of unsecured incremental term facilities, such that the Interest Coverage Ratio (as defined in the Credit Agreement) would not be less than 2.00 to 1.00 at the time of incurrence, subject to certain conditions, including obtaining commitments from any one or more lenders, whether or not currently party to the Credit Agreement, to provide such increased amounts and (ii) amending certain negative covenants. The net carrying value of the 2030 New Term Loan was comprised of the following as of the date indicated (in thousands): October 28, 2023 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value 2030 New Term Loan $ 1,170,000 $ (5,122) $ (5,507) $ 1,159,371 Deferred debt issuance costs that were deducted from the carrying amount of the 2030 New Term Loan totaled $5.5 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 New Term Loan. The amortization of deferred debt issuance costs for the 2030 New Term Loan is included in interest expense, and was $0.1 million during fiscal 2023. As of October 28, 2023, 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 Refinanced Term Loans, including accrued interest. 2025 Term Loan On January 19, 2023, in connection with the Incremental Agreement (as defined below) to the Credit Agreement (as defined below), the Credit Agreement was amended to replace LIBOR with SOFR for the 2025 Term Loan in response to pending impact of FASB Accounting Standards Codification 848, Reference Rate Reform. The net carrying value of the 2025 Term Loan as of October 29, 2022 was $673.0 million. 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 $0.6 million for fiscal 2023 and fiscal 2022. 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 intended to be used for general corporate purposes. The Incremental Agreement amended the Credit Agreement and provided that the 2030 Term Loan would, among other things: • mature on January 19, 2030; • amortize in equal quarterly installments in aggregate amounts equal to 0.25% of the principal amount of the 2030 Term Loan as of January 19, 2023, or $1.25 million, with the balance payable at maturity; • be subject to mandatory prepayment on the same basis as the 2025 Term Loan, including on the occurrence of certain specified events such as asset sales, debt issuances, and receipt of annual Excess Cash Flow (as defined in the Credit Agreement); • bear interest, at Ciena’s election, at a per annum rate equal to (a) SOFR (subject to a floor of 0.00%) plus an applicable margin of 2.50%, or (b) a base rate (subject to a floor of 1.00%) plus an applicable margin of 1.50%; and • be repayable at any time at Ciena’s election, provided that repayment of the 2030 Term Loan with proceeds of certain indebtedness prior to July 19, 2023 will require a prepayment premium of 1.00% of the aggregate principal amount of such prepayment. Except as amended by the Incremental Agreement, the remaining terms of the Credit Agreement remained in full force and effect. 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 Term Loan. The amortization of deferred debt issuance costs for the 2030 Term Loan is included in interest expense and was $0.5 million for fiscal 2023 . 2030 Notes On January 18, 2022, Ciena entered into an Indenture (the “Indenture”) among Ciena, as issuer, certain domestic subsidiaries of Ciena, as guarantors (collectively, the “Guarantors”), and U.S. Bank National Association, as trustee (the “Trustee”), pursuant to which Ciena issued $400.0 million in aggregate principal amount of 4.00% senior notes due 2030 (the “2030 Notes”). The net carrying value of the 2030 Notes was comprised of the following for the period indicated (in thousands): October 28, 2023 October 29, 2022 Principal Balance Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2030 Senior Notes 4.00% fixed-rate $ 400,000 $ (4,265) $ 395,735 $ 395,045 Deferred debt issuance costs that were deducted from the carrying amount of the 2030 Notes totaled $4.3 million as of October 28, 2023 and $5.0 million as of October 29, 2022. 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 $0.7 million during fiscal 2023 and $0.5 million during fiscal 2022 . As of October 28, 2023, the estimated fair value of the 2030 Notes was $330.5 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. On February 10, 2023, pursuant to an ABL Credit Agreement dated October 28, 2019, as amended (the “ABL Credit Agreement”), by and among Ciena, certain of its subsidiaries, the lenders party thereto (the “ABL Lenders”), and Bank of America, as administrative agent, Ciena modified its senior secured asset-backed revolving credit facility (the “ABL Credit Facility”), which provided for a total commitment of $300.0 million to extend its maturity date to September 28, 2025. On October 24, 2023 (the “Closing Date”), pursuant to the Incremental Amendment Agreement to the Credit Agreement (as defined in Note 19 above), Ciena incurred a new senior secured revolving credit facility of $300.0 million (the “Revolving Credit Facility”), which replaced the ABL Credit Facility. Ciena has the option to increase the total revolving commitments under the Revolving Credit Facility to $450.0 million, subject to certain conditions, including obtaining commitments from one or more lenders. The Credit Agreement provides that $200.0 million of the Revolving Credit Facility is available for issuances of letters of credit and allows for swingline loans in an amount not to exceed $50.0 million. On or about the Closing Date, Ciena transferred to the Revolving Credit Facility certain outstanding letters of credit initially issued under the ABL Credit Facility with an undrawn amount of approximately $65.1 million. There were no borrowings outstanding under the ABL Credit Facility as of the Closing Date. Ciena expects to use the Revolving Credit Facility to support the issuance of letters of credit that arise in the ordinary course of its business and for general corporate purposes. The Credit Agreement provides that the Revolving Credit Facility will, among other things: • mature on October 24, 2028; • bear interest on outstanding borrowings, at Ciena’s election, at a per annum rate equal to (a) SOFR (subject to a floor of 0.00%) plus a credit spread adjustment of 0.10% plus an applicable margin ranging from 1.375% to 2.00%, or (b) a base rate (subject to a floor of 1.00%) plus an applicable margin ranging from 0.375% to 1.00%, in each case, with the actual margin determined according to the Total Net Leverage Ratio (as defined in the Credit Agreement above); • have a commitment fee payable on the unused portion of the Revolving Credit Facility at a per annum rate ranging from 0.225% to 0.300%, with the actual rate determined according to the Total Net Leverage Ratio; and • include a restriction on the aggregate amount of Incremental Term Loans and certain other indebtedness that can be incurred in the future equal to an amount that would not result in the Total Net Leverage Ratio exceeding 5.00 to 1.00 at the time of incurrence. The obligations under the Revolving Credit Facility are guaranteed by all of Ciena’s subsidiaries that currently, or in the future are required to, guarantee the obligations of the 2030 New Term Loan, including, as of the Closing Date, Ciena Communications, Inc., Ciena Government Solutions, Inc., Ciena Communications International, LLC and Blue Planet Software, Inc., and are secured on a pari passu basis with the 2030 New Term Loan by a pledge of substantially all of the assets of Ciena and the guarantors. Upon the occurrence of certain events related to the improvement of Ciena’s credit rating and repayment of all secured term loans (“Investment Grade Events”), all collateral securing the obligations under the Revolving Credit Facility will be released at Ciena’s election. Under the Revolving Credit Facility, Ciena is also required to maintain certain financial maintenance covenants, including: • prior to an Investment Grade Event, a maximum Total Secured Net Leverage Ratio of no greater than 3.50 to 1.00 as of the end of any period of four fiscal quarters (provided, that in the event Ciena consummates a qualifying acquisition, Ciena can elect to increase the maximum Total Secured Net Leverage Ratio level to 4.00 to 1.00 for the fiscal quarter in which such qualifying acquisition is consummated and for the next five consecutive fiscal quarters); • on or after an Investment Grade Event, a maximum Total Net Leverage Ratio of no greater than 4.00 to 1.00 as of the end of any period of four fiscal quarters; and • a minimum Interest Coverage Ratio of no less than 3.00 to 1.00 as of the end of any period of four fiscal quarters. Except as amended by the Amendment, the remaining terms of the Credit Agreement remain in full force and effect. As of October 28, 2023 , Ciena was in compliance with the above financial maintenance covenants. As of October 28, 2023 , letters of credit totaling $72.5 million were issued under our Revolving Credit Facility. There were no borrowings outstanding under the Revolving Credit Facility as of October 28, 2023 .

REVOLVING CREDIT FACILITY

REVOLVING CREDIT FACILITY	12 Months Ended
	Oct. 28, 2023
Line of Credit Facility [Abstract]
REVOLVING CREDIT FACILITY	SHORT-TERM AND LONG-TERM DEBT 2030 New Term Loan On October 24, 2023, Ciena, together with certain of its domestic subsidiaries as guarantors, entered into an Incremental Amendment Agreement (the “Amendment”) to its Credit Agreement, dated July 15, 2014, as amended (the “Credit Agreement”), by and among Ciena, certain of its subsidiaries, the lenders party thereto, and Bank of America, N.A., as administrative agent (“Bank of America”), to which Ciena incurred a new tranche of senior secured term loans in an aggregate principal amount of $1.2 billion (the “2030 New Term Loan”) and a new senior secured revolving credit facility of $300 million (the “Revolving Credit Facility” as defined in Note 20 below). The proceeds of the 2030 New Term Loan, net of original issuance discount, replaced, in full, $668.7 million of outstanding principal of the 2025 Term Loan and $497.5 million of outstanding principal of the 2030 Term Loan (as defined below) (“Refinanced Term Loans”), including accrued interest, and pay transaction fees and expenses, resulting in proceeds of $0.8 million. The 2030 New Term Loan requires Ciena to make installment payments of $2.9 million on a quarterly basis. Based on the continuation of existing lenders and the addition of new lenders, this arrangement was primarily accounted for as a modification of debt and, as such, $6.0 million of debt issuance costs associated with the 2030 New Term Loan were expensed. The aggregate balance of approximately $4.4 million of debt issuance costs and approximately $2.2 million of original discount from the 2025 Term Loan and 2030 Term Loan, $0.1 million of debt issuance costs associated with new lenders for the 2030 New Term Loan, and approximately $2.9 million of original discount from the 2030 New Term Loan, were included in the carrying value of the 2030 New Term Loan. The Amendment amends the Credit Agreement and provides that the 2030 New Term Loan will, among other things: • mature on October 24, 2030; • amortize in equal quarterly installments in aggregate amounts equal to 0.25% of the principal amount of the 2030 New Term Loan as of January 19, 2023, or $2.9 million, or $11.7 million annually, with the balance payable at maturity; • be subject to mandatory prepayment upon the occurrence of certain specified events substantially similar to the Refinanced Term Loans, including upon the occurrence of certain specified events such as asset sales, debt issuances, and receipt of annual Excess Cash Flow (as defined in the Credit Agreement); • bear interest, at Ciena’s election, at a per annum rate equal to (a) SOFR (subject to a floor of 0.00%) plus an applicable margin of 2.00%, or (b) a base rate (subject to a floor of 1.00%) plus an applicable margin of 1.00%; and • be repayable at any time at Ciena’s election, provided that repayment of the 2030 New Term Loan with proceeds of certain indebtedness prior to April 24, 2024 will require a prepayment premium of 1.00% of the aggregate principal amount of such prepayment. Among other things, the Amendment also amends the Credit Agreement by (i) modifying the “accordion” feature to provide for incremental term loan facilities (the “Incremental Term Loans”) in an aggregate amount not to exceed the sum of (A) the greater of (1) $640 million and (2) an amount equal to consolidated EBITDA on a pro forma basis for the most recently ended four-quarter period and (B) an amount (1) in the case of secured incremental term facilities that rank pari passu with or junior to the 2030 New Term Loan, such that the Total Secured Net Leverage Ratio (as defined in the Credit Agreement) would not be greater than 3.00 to 1.00 at the time of incurrence and (2) in the case of unsecured incremental term facilities, such that the Interest Coverage Ratio (as defined in the Credit Agreement) would not be less than 2.00 to 1.00 at the time of incurrence, subject to certain conditions, including obtaining commitments from any one or more lenders, whether or not currently party to the Credit Agreement, to provide such increased amounts and (ii) amending certain negative covenants. The net carrying value of the 2030 New Term Loan was comprised of the following as of the date indicated (in thousands): October 28, 2023 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value 2030 New Term Loan $ 1,170,000 $ (5,122) $ (5,507) $ 1,159,371 Deferred debt issuance costs that were deducted from the carrying amount of the 2030 New Term Loan totaled $5.5 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 New Term Loan. The amortization of deferred debt issuance costs for the 2030 New Term Loan is included in interest expense, and was $0.1 million during fiscal 2023. As of October 28, 2023, 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 Refinanced Term Loans, including accrued interest. 2025 Term Loan On January 19, 2023, in connection with the Incremental Agreement (as defined below) to the Credit Agreement (as defined below), the Credit Agreement was amended to replace LIBOR with SOFR for the 2025 Term Loan in response to pending impact of FASB Accounting Standards Codification 848, Reference Rate Reform. The net carrying value of the 2025 Term Loan as of October 29, 2022 was $673.0 million. 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 $0.6 million for fiscal 2023 and fiscal 2022. 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 intended to be used for general corporate purposes. The Incremental Agreement amended the Credit Agreement and provided that the 2030 Term Loan would, among other things: • mature on January 19, 2030; • amortize in equal quarterly installments in aggregate amounts equal to 0.25% of the principal amount of the 2030 Term Loan as of January 19, 2023, or $1.25 million, with the balance payable at maturity; • be subject to mandatory prepayment on the same basis as the 2025 Term Loan, including on the occurrence of certain specified events such as asset sales, debt issuances, and receipt of annual Excess Cash Flow (as defined in the Credit Agreement); • bear interest, at Ciena’s election, at a per annum rate equal to (a) SOFR (subject to a floor of 0.00%) plus an applicable margin of 2.50%, or (b) a base rate (subject to a floor of 1.00%) plus an applicable margin of 1.50%; and • be repayable at any time at Ciena’s election, provided that repayment of the 2030 Term Loan with proceeds of certain indebtedness prior to July 19, 2023 will require a prepayment premium of 1.00% of the aggregate principal amount of such prepayment. Except as amended by the Incremental Agreement, the remaining terms of the Credit Agreement remained in full force and effect. 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 Term Loan. The amortization of deferred debt issuance costs for the 2030 Term Loan is included in interest expense and was $0.5 million for fiscal 2023 . 2030 Notes On January 18, 2022, Ciena entered into an Indenture (the “Indenture”) among Ciena, as issuer, certain domestic subsidiaries of Ciena, as guarantors (collectively, the “Guarantors”), and U.S. Bank National Association, as trustee (the “Trustee”), pursuant to which Ciena issued $400.0 million in aggregate principal amount of 4.00% senior notes due 2030 (the “2030 Notes”). The net carrying value of the 2030 Notes was comprised of the following for the period indicated (in thousands): October 28, 2023 October 29, 2022 Principal Balance Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2030 Senior Notes 4.00% fixed-rate $ 400,000 $ (4,265) $ 395,735 $ 395,045 Deferred debt issuance costs that were deducted from the carrying amount of the 2030 Notes totaled $4.3 million as of October 28, 2023 and $5.0 million as of October 29, 2022. 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 $0.7 million during fiscal 2023 and $0.5 million during fiscal 2022 . As of October 28, 2023, the estimated fair value of the 2030 Notes was $330.5 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. On February 10, 2023, pursuant to an ABL Credit Agreement dated October 28, 2019, as amended (the “ABL Credit Agreement”), by and among Ciena, certain of its subsidiaries, the lenders party thereto (the “ABL Lenders”), and Bank of America, as administrative agent, Ciena modified its senior secured asset-backed revolving credit facility (the “ABL Credit Facility”), which provided for a total commitment of $300.0 million to extend its maturity date to September 28, 2025. On October 24, 2023 (the “Closing Date”), pursuant to the Incremental Amendment Agreement to the Credit Agreement (as defined in Note 19 above), Ciena incurred a new senior secured revolving credit facility of $300.0 million (the “Revolving Credit Facility”), which replaced the ABL Credit Facility. Ciena has the option to increase the total revolving commitments under the Revolving Credit Facility to $450.0 million, subject to certain conditions, including obtaining commitments from one or more lenders. The Credit Agreement provides that $200.0 million of the Revolving Credit Facility is available for issuances of letters of credit and allows for swingline loans in an amount not to exceed $50.0 million. On or about the Closing Date, Ciena transferred to the Revolving Credit Facility certain outstanding letters of credit initially issued under the ABL Credit Facility with an undrawn amount of approximately $65.1 million. There were no borrowings outstanding under the ABL Credit Facility as of the Closing Date. Ciena expects to use the Revolving Credit Facility to support the issuance of letters of credit that arise in the ordinary course of its business and for general corporate purposes. The Credit Agreement provides that the Revolving Credit Facility will, among other things: • mature on October 24, 2028; • bear interest on outstanding borrowings, at Ciena’s election, at a per annum rate equal to (a) SOFR (subject to a floor of 0.00%) plus a credit spread adjustment of 0.10% plus an applicable margin ranging from 1.375% to 2.00%, or (b) a base rate (subject to a floor of 1.00%) plus an applicable margin ranging from 0.375% to 1.00%, in each case, with the actual margin determined according to the Total Net Leverage Ratio (as defined in the Credit Agreement above); • have a commitment fee payable on the unused portion of the Revolving Credit Facility at a per annum rate ranging from 0.225% to 0.300%, with the actual rate determined according to the Total Net Leverage Ratio; and • include a restriction on the aggregate amount of Incremental Term Loans and certain other indebtedness that can be incurred in the future equal to an amount that would not result in the Total Net Leverage Ratio exceeding 5.00 to 1.00 at the time of incurrence. The obligations under the Revolving Credit Facility are guaranteed by all of Ciena’s subsidiaries that currently, or in the future are required to, guarantee the obligations of the 2030 New Term Loan, including, as of the Closing Date, Ciena Communications, Inc., Ciena Government Solutions, Inc., Ciena Communications International, LLC and Blue Planet Software, Inc., and are secured on a pari passu basis with the 2030 New Term Loan by a pledge of substantially all of the assets of Ciena and the guarantors. Upon the occurrence of certain events related to the improvement of Ciena’s credit rating and repayment of all secured term loans (“Investment Grade Events”), all collateral securing the obligations under the Revolving Credit Facility will be released at Ciena’s election. Under the Revolving Credit Facility, Ciena is also required to maintain certain financial maintenance covenants, including: • prior to an Investment Grade Event, a maximum Total Secured Net Leverage Ratio of no greater than 3.50 to 1.00 as of the end of any period of four fiscal quarters (provided, that in the event Ciena consummates a qualifying acquisition, Ciena can elect to increase the maximum Total Secured Net Leverage Ratio level to 4.00 to 1.00 for the fiscal quarter in which such qualifying acquisition is consummated and for the next five consecutive fiscal quarters); • on or after an Investment Grade Event, a maximum Total Net Leverage Ratio of no greater than 4.00 to 1.00 as of the end of any period of four fiscal quarters; and • a minimum Interest Coverage Ratio of no less than 3.00 to 1.00 as of the end of any period of four fiscal quarters. Except as amended by the Amendment, the remaining terms of the Credit Agreement remain in full force and effect. As of October 28, 2023 , Ciena was in compliance with the above financial maintenance covenants. As of October 28, 2023 , letters of credit totaling $72.5 million were issued under our Revolving Credit Facility. There were no borrowings outstanding under the Revolving Credit Facility as of October 28, 2023 .

EARNINGS PER SHARE CALCULATION

EARNINGS PER SHARE CALCULATION	12 Months Ended
	Oct. 28, 2023
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 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 (in thousands except per share amounts): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Net income $ 254,827 $ 152,902 $ 500,196 Basic weighted average shares outstanding 148,971 151,208 155,279 Effect of dilutive potential common shares 409 985 1,464 Diluted weighted average shares outstanding 149,380 152,193 156,743 Basic EPS $ 1.71 $ 1.01 $ 3.22 Diluted EPS $ 1.71 $ 1.00 $ 3.19 Antidilutive employee share-based awards, excluded 2,675 1,370 110

STOCKHOLDERS_ EQUITY

STOCKHOLDERS’ EQUITY	12 Months Ended
	Oct. 28, 2023
Equity [Abstract]
STOCKHOLDERS' EQUITY	STOCKHOLDERS’ EQUITY Stock Repurchase Program and Accelerated Share Repurchase Agreement On December 13, 2018, Ciena announced that its Board of Directors authorized a program to repurchase up to $500 million of Ciena’s common stock. During fiscal 2021, Ciena repurchased 1.7 million shares of its common stock, for an aggregate purchase price of $92.1 million at an average price of $54.27 per share. Under this program, Ciena repurchased a total of 7.4 million shares of its common stock, for an aggregate purchase price of $316.7 million at an average price of $42.75 per share. On December 9, 2021, Ciena announced that its Board of Directors replaced its previously authorized program, as described above, with a program to repurchase up to $1.0 billion of its common stock. On December 13, 2021, Ciena entered into an accelerated share repurchase agreement (the “ASR Agreement”) with Goldman, Sachs & Co. LLC (“Goldman”) to repurchase $250.0 million (the “Repurchase Price”) of its common stock as part of the repurchase program. Under the terms of the ASR Agreement, Ciena paid the Repurchase Price to Goldman, and received approximately 3.6 million shares of its common stock from Goldman, calculated based on the average of the volume-weighted average prices of Ciena’s common stock of $69.78 for the period from December 14, 2021 to February 11, 2022, less a discount, which completed the repurchases contemplated by the ASR Agreement. Shares repurchased pursuant to the ASR Agreement were immediately retired upon receipt. During the remainder of fiscal 2022, Ciena repurchased an additional 4.8 million shares of its common stock, for an aggregate purchase price of $250.0 million at an average price of $51.53 per share. During fiscal 2023, Ciena repurchased an additional 5.7 million shares of its common stock, for an aggregate purchase price of $250.0 million at an average price of $44.08 per share. As of October 28, 2023, Ciena has repurchased an aggregate of 14.1 million shares for an aggregate purchase price of $750.0 million at an average price of $53.17 per share and has an aggregate of $250.0 million of authorized funds 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. Impact of Inflation Reduction Act 1% Excise Tax on Share Repurchases Beginning fiscal 2023, a 1% excise tax on the market value of shares repurchased offset by 1% of the market value of shares issued was implemented. During fiscal 2023, a net excise tax of $1.5 million was recorded to additional paid-in capital on the Consolidated Balance Sheets. Stock Repurchases Related to Restricted Stock Unit Tax Withholdings Ciena repurchases shares of common stock to satisfy employee tax withholding obligations due upon vesting of stock unit awards. The related purchase price of $38.5 million for the shares of Ciena’s stock repurchased during fiscal 2023 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.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Oct. 28, 2023
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES For the periods indicated, the provision (benefit) for income taxes consists of the following (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Provision (benefit) for income taxes: Current: Federal $ 36,537 $ 27,479 $ 72,603 State 18,860 10,289 21,400 Foreign 28,281 19,337 25,021 Total current 83,678 57,105 119,024 Deferred: Federal (8,010) (30,032) (21,942) State (17,354) 520 (11,546) Foreign 10,512 2,010 (122,981) Total deferred (14,852) (27,502) (156,469) Provision (benefit) for income taxes $ 68,826 $ 29,603 $ (37,445) For the periods indicated, income before provision (benefit) for income taxes consists of the following (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 United States $ 93,682 $ 28,784 $ 298,514 Foreign 229,971 153,721 164,237 Total $ 323,653 $ 182,505 $ 462,751 Ciena’s foreign income tax as a percentage of foreign income may appear disproportionate compared to the expected tax based on the U.S. federal statutory rate and is dependent on the mix of earnings and tax rates in foreign jurisdictions. For the periods indicated, the tax provision reconciles to the amount computed by multiplying income before income taxes by the U.S. federal statutory rate of 21% for fiscal 2023, fiscal 2022 and fiscal 2021 as follows: Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Provision at statutory rate 21.00 % 21.00 % 21.00 % Intercompany IP Restructuring Transaction — % — % (25.85) % State taxes 1.65 % 2.31 % 3.73 % Withholding and other foreign taxes (0.09) % (1.37) % 2.76 % Research and development credit (16.78) % (23.66) % (7.99) % Non-deductible compensation 5.29 % 5.26 % 1.68 % Foreign derived intangible income — % — % (1.82) % US Taxation on foreign activity 5.08 % 1.73 % — % Foreign Nontaxable interest (1.06) % (1.90) % — % Taxation on foreign inflation 1.34 % 1.41 % 0.16 % Rate change (3.71) % 1.27 % (4.33) % Valuation allowance 9.44 % 8.35 % 1.77 % Loss on equity transactions (1.72) % — % — % Uncertain tax positions 1.72 % 1.62 % 0.63 % Other (0.89) % 0.20 % 0.17 % Effective income tax rate 21.27 % 16.22 % (8.09) % Our future income tax provisions and deferred tax balances may be affected by the amount of pre-tax income, the jurisdictions where it is earned, the existence and ability to utilize tax attributes and changes in tax laws and business reorganizations. In fiscal 2021, Ciena began implementation of a plan to reorganize its global supply chain and distribution structure more substantially, which included a legal entity reorganization and related system upgrade. Ciena completed the first phase of this plan in fiscal 2021, and substantially completed the reorganization during fiscal 2022. As part of this reorganization, Ciena completed an internal transfer of certain of its non-U.S. intangible assets, which created amortizable tax basis resulting in the discrete recognition of a $119.3 million deferred tax asset with a corresponding tax benefit. The impact of this transfer is reflected in Ciena’s effective tax rate for the year ended October 30, 2021, which had a significant, one-time impact on its net income for the period. Ciena is also required to make accounting policy elections as a result of the Tax Act. These include whether a valuation allowance is recorded for the estimated effect of the application of GILTI and BEAT or if these will be treated as period costs when incurred. Ciena had made the incremental cash tax cost policy election with respect to analyzing the impact of GILTI on the assessment of the realizability of net operating losses. The realizability of U.S. tax carryforwards is not impacted by the BEAT, and the BEAT is a period cost when incurred. Ciena is also required to elect to treat taxes due on future GILTI inclusions in U.S. taxable income either as a current period expense when incurred or reflect such portion of the future GILTI inclusions in U.S. taxable income that relate to existing basis differences in Ciena’s current measurement of deferred taxes. Ciena’s accounting policy election is to treat the taxes due on future U.S. inclusions in taxable income under GILTI as a period cost when incurred. The significant components of deferred tax assets are as follows (in thousands): Year Ended October 28, 2023 October 29, 2022 Deferred tax assets: Reserves and accrued liabilities $ 82,160 $ 76,839 Depreciation and amortization 712,098 690,636 NOL and credit carry forward 197,984 154,707 Other 6,934 63,902 Gross deferred tax assets 999,176 986,084 Valuation allowance (189,870) (162,076) Deferred tax asset, net of valuation allowance $ 809,306 $ 824,008 A reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest and penalties, is as follows (in thousands): Amount Unrecognized tax benefits at October 31, 2020 $ 95,748 Decrease related to positions taken in prior period (22,854) Reductions related to settlements with taxing authorities (654) Increase related to positions taken in current period 5,510 Reductions related to expiration of statute of limitations (659) Unrecognized tax benefits at October 30, 2021 77,091 Increase related to positions taken in prior period 4,732 Reductions related to settlements with taxing authorities (3,229) Increase related to positions taken in current period 2,959 Reductions related to expiration of statute of limitations (1,039) Unrecognized tax benefits at October 29, 2022 80,514 Increase related to positions taken in prior period 9,940 Reductions related to settlements with taxing authorities (625) Increase related to positions taken in current period 4,960 Reductions related to expiration of statute of limitations (869) Unrecognized tax benefits at October 28, 2023 $ 93,920 As of October 28, 2023 and October 29, 2022 , Ciena had accrued $7.9 million and $5.2 million of interest and penalties, respectively, related to unrecognized tax benefits included in other long-term obligations in the Consolidated Balance Sheets. Interest and penalties of $2.7 million and $1.7 million were recorded as a net expense to the provision for income taxes during fiscal 2023 and 2022, respectively. During fiscal 2021, Ciena recorded a net benefit to the provision for interest and penalties in its provision for income taxes of $0.1 million. If recognized, the entire balance of unrecognized tax benefits would impact the effective tax rate. Over the next 12 months, Ciena does not estimate any material changes in unrecognized income tax benefits. During the fourth quarter of fiscal 2023, Ciena evaluated the undistributed earnings of its foreign subsidiaries and identified approximately $222.0 million in earnings that are no longer considered to be indefinitely reinvested. Ciena recorded a provision of $2.5 million that reflects the income tax effects of the repatriation of these earnings. No additional income tax expense has been provided for any remaining undistributed foreign earnings, or any additional outside basis difference from investments in the foreign subsidiaries, as these amounts continue to be indefinitely reinvested. If the remaining undistributed foreign earnings and profits of $381.0 million were repatriated to the U.S., the provisional amount of unrecognized deferred tax liability, which is primarily related to foreign withholding taxes, is an estimated $30.0 million; however, the amount may be lower depending on Ciena’s ability to utilize tax credits associated with the distribution. Additionally, there are no other significant temporary differences for which a deferred tax liability or asset has not been recognized. As of October 28, 2023 , Ciena continues to maintain a valuation allowance of $189.9 million against its gross deferred tax assets primarily. The valuation allowance is primarily related to state and foreign net operating losses and credits that Ciena estimates it will not be able to use. The following table summarizes the activity in Ciena’s valuation allowance against its gross deferred tax assets (in thousands): Year Ended Beginning Balance Additions Deductions Ending Balance October 30, 2021 $ 151,427 $ 17,897 $ 9,690 $ 159,634 October 29, 2022 $ 159,634 $ 15,245 $ 12,803 $ 162,076 October 28, 2023 $ 162,076 $ 28,746 $ 952 $ 189,870

SHARE-BASED COMPENSATION EXPENS

SHARE-BASED COMPENSATION EXPENSE	12 Months Ended
	Oct. 28, 2023
Share-Based Payment Arrangement [Abstract]
SHARE-BASED COMPENSATION EXPENSE	SHARE-BASED COMPENSATION EXPENSE Ciena has outstanding equity awards issued under its 2017 Omnibus Incentive Plan (the “2017 Plan”), its 2008 Omnibus Incentive Plan, and certain legacy equity plans and equity plans assumed as a result of previous acquisitions. All equity awards granted on or after March 23, 2017 are made exclusively from the 2017 Plan. Ciena also makes shares of its common stock available for purchase under the ESPP. Each of the 2017 Plan and the ESPP are described below. 2017 Plan The 2017 Plan has a ten-year term and authorizes the issuance of awards including stock options, restricted stock units (RSUs), restricted stock, unrestricted stock, stock appreciation rights (SARs) and other equity and/or cash performance incentive awards to employees, directors and consultants of Ciena. Subject to certain restrictions, the Compensation Committee of the Board of Directors has broad discretion to establish the terms and conditions for awards under the 2017 Plan, including the number of shares, vesting conditions, and the required service or performance criteria. Options and SARs have a maximum term of ten years, and their exercise price may not be less than 100% of fair market value on the date of grant. Repricing of stock options and SARs is prohibited without stockholder approval. Certain change in control transactions may cause awards granted under the 2017 Plan to vest, unless the awards are continued or substituted for in connection with the transaction. The 2017 Plan authorizes and reserves 21.1 million shares for issuance. The number of shares available under the 2017 Plan are also increased from time to time by: (i) the number of shares subject to outstanding awards granted under Ciena’s prior equity compensation plans that are forfeited, expire or are canceled without delivery of common stock following the effective date of the 2017 Plan, and (ii) the number of shares subject to awards assumed or substituted in connection with the acquisition of another company. As of October 28, 2023, the total number of shares authorized for issuance under the 2017 Plan was 21.1 million and approximately 5.6 million shares remained available for issuance thereunder. Stock Options There were no stock options granted by Ciena during fiscal 2023, fiscal 2022 or fiscal 2021. Outstanding stock option awards granted to employees in prior periods are generally subject to service-based vesting conditions and vest over a four-year period. The following table is a summary of Ciena’s stock option activity for the periods indicated (shares in thousands): Shares Weighted Balance at October 29, 2022 32 $ 30.98 Granted — — Exercised (22) $ 33.98 Canceled (3) $ 45.32 Balance at October 28, 2023 7 $ 16.94 The total intrinsic value of options exercised during fiscal 2023, fiscal 2022 and fiscal 2021 was $0.3 million, $1.6 million and $0.5 million, respectively. The following table summarizes information with respect to stock options outstanding at October 28, 2023 , based on Ciena’s closing stock price on the last trading day of Ciena’s fiscal 2023 (shares and intrinsic value in thousands): Options Outstanding and Vested at October 28, 2023 Number Weighted Weighted Range of of Contractual Average Aggregate Exercise Underlying Life Exercise Intrinsic Price Shares (Years) Price Value $ 14.38 — $ 18.22 7 0.36 $ 16.94 $ 178 Assumptions for Option-Based Awards Ciena recognizes the fair value of stock options as share-based compensation expense on a straight-line basis over the requisite service period. Ciena did not grant any option-based awards during fiscal 2023, fiscal 2022 or fiscal 2021. Restricted Stock Units A restricted stock unit is a stock award that entitles the holder to receive shares of Ciena common stock as the unit vests. Ciena’s outstanding restricted stock unit awards are subject to service-based vesting conditions and/or performance-based vesting conditions. Awards subject to service-based conditions typically vest in increments over a three However, the 2017 Plan permits Ciena to grant service-based stock awards with a minimum one-year vesting period. Awards with performance-based vesting conditions (i) require the achievement of certain operational, financial or other performance criteria or targets or (ii) vest based on Ciena’s total stockholder return as compared to an index of peer companies, in whole or in part. During fiscal 2023, Ciena introduced a benefit pursuant to which, upon completion of ten years of service and reaching age 60, executive officers who are residents of the United States, the United Kingdom, or Canada and who provide 12 months’ notice of their retirement will receive continued vesting of all of their granted but unvested restricted stock unit (“RSU”) awards and a pro-rated amount of their performance stock unit awards and market stock unit awards. Other employees in these countries will be subject to the same eligibility and notice requirements, but will receive acceleration of their granted but unvested RSU awards upon retirement. This program accelerates the recognition of share-based compensation expense. Assumptions for Restricted Stock Unit Awards Ciena recognizes the estimated fair value of restricted stock units subject only to service-based vesting conditions by multiplying the number of shares underlying the award by the closing price per share of Ciena common stock on the grant date. Share-based expense for service-based restricted stock unit awards is recognized ratably over the vesting period on a straight-line basis. Ciena recognizes the estimated fair value of restricted stock units subject to performance-based vesting conditions other than total stockholder return, by assuming the satisfaction of any performance-based objectives at the “target” level and multiplying the corresponding number of shares earned based upon such achievement by the closing price per share of Ciena common stock on the grant date. Share-based compensation expense is recognized over the performance period, using graded vesting, which considers each performance period or tranche separately, based on Ciena’s determination of whether it is probable that the performance targets will be achieved. At the end of each reporting period, Ciena reassesses the probability of achieving the performance targets and the performance period required to meet those targets. The estimation of whether the performance targets will be achieved involves judgment. Revisions are reflected in the period in which the estimate is changed. If any performance goals are not met, no compensation cost is ultimately recognized against that goal and, to the extent previously recognized, compensation expense is reversed. Share-based compensation expense for restricted stock units subject only to service-based vesting conditions and restricted stock units subject to performance-based vesting conditions other than total stockholder return, is recognized only for those awards that ultimately vest. In the event of a forfeiture of an award, the expense related to the unvested portion of that award is reversed. Reversal of share-based compensation expense based on forfeitures can materially affect the measurement of estimated fair value of Ciena’s share-based compensation. Ciena recognizes the estimated fair value of performance based awards subject to total stockholder return as compared to an index of peer companies using a Monte Carlo simulation valuation model. Ciena reverses share-based compensation expense on performance based awards subject to total shareholder return only when the requisite service period is not reached. Assumptions for awards granted during fiscal 2023, fiscal 2022 and fiscal 2021 included the following: Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Expected volatility of Ciena common stock, which is a weighted average of implied volatility and historical volatility 40.37% 38.27% 41.00% Historical volatility of Ciena common stock 43.11% 42.17% 42.80% Historical volatility of S&P Networking Index 30.93% 27.22% 27.30% Correlation coefficient 0.7781 0.7049 0.6800 Expected life in years 2.89 2.89 2.87 Risk-free interest rate 3.95% 0.94% 0.17% Expected dividend yield 0.0% 0.0% 0.0% The following table is a summary of Ciena’s restricted stock unit activity for the period indicated, with the aggregate fair value of the balance outstanding at the end of each period, based on Ciena’s closing stock price on the last trading day of the relevant period (shares and aggregate fair value in thousands): Restricted Weighted Aggregate Fair Balance at October 29, 2022 4,103 $ 55.16 $ 197,960 Granted 3,301 Vested (2,067) Canceled or forfeited (415) Balance at October 28, 2023 4,922 $ 53.42 $ 201,916 As of October 28, 2023 and October 29, 2022 , 0.3 million of the total restricted stock units outstanding are performance based awards subject to total stockholder return. The total fair value of restricted stock units that vested and were converted into common stock during fiscal 2023, fiscal 2022 and fiscal 2021 was $98.2 million, $119.0 million and $110.0 million, respectively. The weighted average fair value of each restricted stock unit granted by Ciena during fiscal 2023, fiscal 2022 and fiscal 2021 was $50.48, $67.03 and $48.70, respectively. Amended and Restated ESPP Ciena makes shares of its common stock available for purchase under the ESPP, under which eligible employees may enroll in a twelve-month offer period that begins in December and June of each year. Each offer period includes two six-month purchase periods. Employees may purchase a limited number of shares of Ciena common stock at 85% of the fair market value on either the day immediately preceding the offer date or the purchase date, whichever is lower. The ESPP is considered compensatory for purposes of share-based compensation expense. Unless earlier terminated, the ESPP will terminate on April 1, 2031. During fiscal 2023, Ciena issued 0.8 million shares and during both fiscal 2022 and fiscal 2021, Ciena issued 0.7 million shares, respectively, under the ESPP. At October 28, 2023, 11.3 million shares remained available for issuance under the ESPP. Share-Based Compensation Expense The following table summarizes share-based compensation expense for the periods indicated (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Products $ 4,518 $ 3,867 $ 3,408 Services 10,470 7,533 5,181 Share-based compensation expense included in cost of goods sold 14,988 11,400 8,589 Research and development 42,331 31,879 21,863 Sales and marketing 35,136 31,280 25,152 General and administrative 37,587 30,435 28,804 Share-based compensation expense included in operating expense 115,054 93,594 75,819 Share-based compensation expense capitalized in inventory, net 413 137 (72) Total share-based compensation $ 130,455 $ 105,131 $ 84,336 As of October 28, 2023 , total unrecognized share-based compensation expense was $201.0 million which relates to unvested restricted stock units and is expected to be recognized over a weighted-average period of 1.39 years.

SEGMENT AND ENTITY WIDE DISCLOS

SEGMENT AND ENTITY WIDE DISCLOSURES	12 Months Ended
	Oct. 28, 2023
Segment Reporting [Abstract]
SEGMENT AND ENTITY WIDE DISCLOSURES	SEGMENT 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, operating 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 October 28, 2023 , equipment, building, furniture and fixtures, net, totaled $280.1 million, and operating ROU assets totaled $35.1 million both of which support asset groups within Ciena’s four operating segments and unallocated selling and general and administrative activities. As of October 28, 2023 , finite-lived intangible assets, goodwill and maintenance spares are assigned to asset groups within the following segments (in thousands): October 28, 2023 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Other intangible assets, net $ 188,383 $ — $ 17,244 $ — $ 205,627 Goodwill $ 199,525 $ 156,191 $ 89,049 $ — $ 444,765 Maintenance spares, net $ — $ — $ — $ 54,042 $ 54,042 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 (loss), net; interest expense; loss on extinguishment and modification of debt and provision (benefit) for income taxes. The table below sets forth Ciena’s segment profit (loss) and the reconciliation to consolidated net income for the respective periods indicated (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Segment profit (loss): Networking Platforms $ 778,641 $ 572,305 $ 850,901 Platform Software and Services 186,945 175,108 136,602 Blue Planet Automation Software and Services (33,669) (22,388) (711) Global Services 196,375 210,663 198,521 Total segment profit 1,128,292 935,688 1,185,313 Less: non-performance operating expenses Selling and marketing 490,804 466,565 452,214 General and administrative 215,284 179,382 181,874 Significant asset impairments and restructuring costs 23,834 33,824 29,565 Amortization of intangible assets 37,351 32,511 23,732 Acquisition and integration costs 3,474 598 2,572 Add: other non-performance financial items Interest and other income (loss), net 62,008 6,747 (1,768) Interest expense (88,026) (47,050) (30,837) Loss on extinguishment and modification of debt (7,874) — — Less: Provision (benefit) for income taxes 68,826 29,603 (37,445) Consolidated net income $ 254,827 $ 152,902 $ 500,196 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 below, Ciena’s geographic distribution of equipment, building, furniture and fixtures, net, and operating ROU assets was as follows (in thousands): October 28, 2023 October 29, 2022 Canada $ 229,707 $ 226,451 United States 46,933 47,515 Other International 38,647 38,921 Total $ 315,287 $ 312,887

OTHER EMPLOYEE BENEFIT PLANS

OTHER EMPLOYEE BENEFIT PLANS	12 Months Ended
	Oct. 28, 2023
Retirement Benefits [Abstract]
OTHER EMPLOYEE BENEFIT PLANS	OTHER EMPLOYEE BENEFIT PLANS Ciena has a Defined Contribution Pension Plan that covers a majority of its Canada-based employees. The plan covers all Canada-based employees who are not part of an excluded group. Total contributions (employee and employer) cannot exceed the lesser of 18% of participant earnings and an annual dollar limit of CAD$31,560 (approximately $25,748 for 2023). This plan includes a required employer contribution of 1% for all participants and an employer matching contribution equal to 50% of the first 6% an employee contributes each pay period. During fiscal 2023, 2022 and 2021, Ciena made matching contributions of approximately CAD$10.6 million (approximately $7.6 million), CAD$10.1 million (approximately $7.3 million) and CAD$8.3 million (approximately $6.0 million), respectively. Ciena has a 401(k) defined contribution profit sharing plan that covers a majority of its United States-based employees. Participants may contribute up to 60% of base pay through pre-tax or Roth contributions, subject to certain limitations. The plan includes an employer matching contribution equal to 50% of the first 8% an employee contributes each pay period. Ciena may also make discretionary annual profit contributions up to the IRS regulated limit. Ciena has made no profit sharing contributions to date. During fiscal 2023, 2022 and 2021, Ciena made matching contributions of approximately $10.4 million, $9.2 million and $8.4 million, respectively.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Oct. 28, 2023
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 October 28, 2023 , Ciena had $1.7 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.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Pay vs Performance Disclosure
Net income	$ 254,827	$ 152,902	$ 500,196

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	12 Months Ended
	Oct. 28, 2023 shares	Oct. 28, 2023 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		The following table describes, for the quarter ended October 28, 2023, 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 David Rothenstein (Senior Vice President, Chief Strategy Officer and Secretary) Adoption (September 22, 2023) Rule 10b5-1 trading arrangement Sales Until January 14, 2025, or such earlier date upon which all transactions are completed or expire without execution Up to 42,000 shares of common stock Scott McFeely (former Senior Vice President, Global Products and Services) Adoption (October 12, 2023) Rule 10b5-1 trading arrangement Sales Until December 31, 2024, or such earlier date upon which all transactions are completed or expire without execution Up to 38,500 shares of common stock
Rule 10b5-1 Arrangement Adopted	true
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
David Rothenstein [Member]
Trading Arrangements, by Individual
Name	David Rothenstein
Title	Senior Vice President, Chief Strategy Officer and Secretary
Adoption Date	September 22, 2023
Arrangement Duration	480 days
Aggregate Available	42,000	42,000
Scott McFeely [Member]
Trading Arrangements, by Individual
Name	Scott McFeely
Title	former Senior Vice President, Global Products and Services
Adoption Date	October 12, 2023
Arrangement Duration	446 days
Aggregate Available	38,500	38,500

CIENA CORPORATION AND SIGNIFI_2

CIENA CORPORATION AND SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES (Policies)	12 Months Ended
	Oct. 28, 2023
Accounting Policies [Abstract]
Principles of Consolidation	The accompanying consolidated financial statements include the accounts of Ciena and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Fiscal Year	Ciena has a 52 or 53-week fiscal year, which ends on the Saturday nearest to the last day of October in each year ( October 28, 2023 , October 29, 2022, and October 30, 2021,
Business Combinations	Ciena records acquisitions using the purchase method of accounting. All of the assets acquired, liabilities assumed, contractual contingencies and contingent consideration are recognized at their fair value as of the acquisition date. The excess of the purchase price over the estimated fair values of the net tangible and net intangible assets acquired is recorded as goodwill. The application of the purchase method of accounting for business combinations requires management to make significant estimates and assumptions in the determination of the fair value of assets acquired and liabilities assumed, in order to properly allocate purchase price consideration between assets that are depreciated and amortized from goodwill. These assumptions and estimates include a market participant’s use of the asset and the appropriate discount rates for a market participant. Ciena’s estimates are based on historical experience, information obtained from the management of the acquired companies and, when appropriate, include assistance from independent third-party appraisal firms. Significant assumptions and estimates can include, but are not limited to, the cash flows that an asset is expected to generate in the future, the appropriate weighted-average cost of capital and the cost savings expected to be derived from acquiring an asset. These estimates are inherently uncertain and unpredictable. In addition, unanticipated events and circumstances may occur which may affect the accuracy or validity of such estimates.
Use of Estimates	The preparation of the financial statements and related disclosures in conformity with Generally Accepted Accounting Principles (“GAAP”) requires management to make estimates and judgments that affect the amounts reported in the consolidated financial statements and accompanying notes. Estimates are used for selling prices for multiple element arrangements, shared-based compensation, bad debts, valuation of inventories and investments, recoverability of intangible assets, other long-lived assets and goodwill, income taxes, warranty obligations, restructuring liabilities, derivatives, contingencies and litigation. Ciena bases its estimates on historical experience and assumptions that it believes are reasonable. Actual results may differ materially from management’s estimates.
Cash and Cash Equivalents	Ciena considers all highly liquid investments purchased with original maturities of three months or less to be cash equivalents. Any restricted cash collateralizing letters of credit is included in other current assets and other long-term assets depending on the duration of the restriction.
Investments	Ciena’s investments in debt securities are classified as available-for-sale and reported at fair value, with unrealized gains and losses recorded in accumulated other comprehensive loss. Ciena recognizes losses in the income statement when it determines that declines in the fair value of its investments below their cost basis are other-than-temporary. In determining whether a decline in fair value is other-than-temporary, Ciena considers various factors, including market price (when available), investment ratings, the financial condition and near-term prospects of the investee, the length of time and the extent to which the fair value has been less than Ciena’s cost basis, and Ciena’s intent and ability to hold the investment until maturity or for a period of time sufficient to allow for any anticipated recovery in market value. Ciena considers all marketable debt securities that it expects to convert to cash within one year or less to be short-term investments, with all others considered to be long-term investments. Ciena has minority equity investments in privately held technology companies that are classified in other long-term assets. These investments are carried at cost because Ciena owns less than 20% of the voting equity and does not have the ability to exercise significant influence over the company. Ciena monitors these investments for impairment and makes appropriate reductions to the carrying value when necessary. As of October 28, 2023
Inventories	Inventories are stated at the lower of cost or market, with cost computed using standard cost, which approximates actual cost, on a first-in, first-out basis. Ciena records a provision for excess and obsolete inventory when an impairment has been identified.
Segment Reporting	Ciena’s chief operating decision maker, its chief executive officer, evaluates the Company’s performance and allocates resources based on multiple factors, including measures of segment profit (loss). Operating segments are defined as components of an enterprise that engage in business activities that may earn revenue and incur expense, for which discrete financial information is available, and for which such information is evaluated regularly by the chief operating decision maker for purposes of allocating resources and assessing performance. 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.
Goodwill	Goodwill is the excess of the purchase price over the fair values assigned to the net assets acquired in a business combination. Ciena tests goodwill for impairment on an annual basis, which it has determined to be the last business day of fiscal September each year. Ciena also tests goodwill for impairment between annual tests if an event occurs or circumstances change that would, more likely than not, reduce the fair value of the reporting unit below its carrying value. Annually, Ciena tests goodwill impairment qualitatively, or quantitatively by comparing the fair value of the reporting unit with the unit’s carrying amount, including goodwill. If this test indicates that the fair value is less than the carrying value, then an impairment loss is recognized limited to the total amount of goodwill allocated to that reporting unit. A non-cash goodwill impairment charge would have the effect of decreasing earnings or increasing losses in such period. If Ciena is required to take a substantial impairment charge, its operating results would be materially adversely affected in such period.
Long-lived Assets	Long-lived assets include equipment, building, furniture and fixtures, operating right-of-use (“ROU”) assets, finite-lived intangible assets and maintenance spares. Ciena tests long-lived assets for impairment whenever triggering events or changes in circumstances indicate that the asset’s carrying amount is not recoverable from its undiscounted cash flows. An impairment loss is measured as the amount by which the carrying amount of the asset or asset group exceeds its fair value. Ciena’s long-lived assets are assigned to asset groups that represent the lowest level for which cash flows can be identified.
Equipment, Building, Furniture and Fixtures and Internal Use Software	Equipment, building, furniture and fixtures are recorded at cost. Depreciation and amortization are computed using the straight-line method, generally over useful lives of three years to five years for equipment and furniture and fixtures and the shorter of useful life or lease term for leasehold improvements. Qualifying internal use software and website development costs incurred during the application development stage, which consist primarily of outside services and purchased software license costs, are capitalized and amortized straight-line over the estimated useful lives of two years to five years.
Leases	At the inception of a contract, Ciena must determine whether the contract is or contains a lease. The contract is or contains a lease if the contract conveys the right to control the use of the property, plant, or equipment for a designated term in exchange for consideration. Ciena’s evaluation of its contracts follows the assessment of whether there is a right to obtain substantially all of the economic benefits from the use and the right to direct the use of the identified asset in the contract. Operating leases are included in the Operating ROU assets, Operating lease liabilities and Long-term operating lease liabilities in the Consolidated Balance Sheets. Finance leases are included in Equipment, building, furniture and fixtures, net (“Finance ROU assets”), Accrued liabilities and other short-term obligations and Other long-term obligations in the Consolidated Balance Sheets. Ciena has operating and finance leases that primarily relate to real property. Ciena has elected not to capitalize leases with a term of 12 months or less without a purchase option that it is likely to exercise. Ciena has elected not to separate lease and non-lease components of operating and finance leases. Lease components are payment items directly attributable to the use of the underlying asset, while non-lease components are explicit elements of a contract not directly related to the use of the underlying asset, including pass-through operating expenses like common area maintenance and utilities.
Intangible Assets	Ciena has recorded finite-lived intangible assets as a result of several acquisitions. Finite-lived intangible assets are carried at cost less accumulated amortization. Amortization is computed using the straight-line method over the expected economic lives of the respective assets, up to seven years, which approximates the use of intangible assets.
Cloud Computing Arrangements	Ciena capitalizes certain costs related to hosting arrangements that are service contracts (cloud computing arrangements). Capitalized costs are included in Other long-term assets in the Consolidated Balance Sheets and are amortized on a straight-line basis over the estimated useful life.
Maintenance Spares	Maintenance spares are recorded at cost. Ciena depreciates spares ratably over four years.
Concentrations	Substantially all of Ciena’s cash and cash equivalents are maintained at a small number of major U.S. financial institutions. The majority of Ciena’s cash equivalents consist of money market funds. Deposits held with banks may exceed the amount of insurance provided on such deposits. Because these deposits generally may be redeemed upon demand, management believes that they bear minimal risk. Historically, a significant percentage of Ciena’s revenue has been concentrated among sales to a small number of large communications service providers and cloud providers. Consolidation among Ciena’s customers has increased this concentration. Consequently, Ciena’s accounts receivable are concentrated among these customers. See Note 2 below. Additionally, Ciena’s access to certain materials or components is dependent on sole or limited source suppliers. The inability of any of these suppliers to fulfill Ciena’s supply requirements, or significant changes in supply cost, could affect future results. Ciena relies on a small number of contract manufacturers to perform the majority of the manufacturing for its products. If Ciena cannot effectively manage these manufacturers or forecast future demand, or if these manufacturers fail to deliver products or components on time, Ciena’s business and results of operations may suffer.
Revenue Recognition	Ciena recognizes revenue when control of the promised products or services is transferred to its customer, in an amount that reflects the consideration to which Ciena expects to be entitled in exchange for those products or services. Ciena determines revenue recognition by applying the following five-step approach: • identification of the contract, or contracts, with a customer; • identification of the performance obligations in the contract; • determination of the transaction price; • allocation of the transaction price to the performance obligations in the contract; and • recognition of revenue when, or as, Ciena satisfies a performance obligation. Generally, Ciena makes sales pursuant to purchase orders placed by customers under framework agreements that govern the general commercial terms and conditions of the sale of Ciena’s products and services. These purchase orders under framework agreements are used to determine the identification of the contract or contracts with this customer. Purchase orders typically include the description, quantity, and price of each product or service purchased. Purchase orders may include one-line bundled pricing for both products and services. Accordingly, purchase orders can include various combinations of products and services that are generally distinct and accounted for as separate performance obligations. Ciena evaluates each promised product and service offering to determine whether it represents a distinct performance obligation. In doing so, Ciena considers, among other things, customary business practices, whether the customer can benefit from the product or service on its own or together with other resources that are readily available, and whether Ciena’s commitment to transfer the product or service to the customer is separately identifiable from other obligations in the purchase order. For transactions where Ciena delivers the product or services, Ciena is typically the principal and records revenue and costs of goods sold on a gross basis. Purchase orders are invoiced based on the terms set forth either in the purchase order or the framework agreement, as applicable. Generally, sales of products and software licenses are invoiced upon shipment or delivery. Maintenance and software subscription services are invoiced quarterly or annually in advance of the service term. Ciena’s other service offerings are generally invoiced upon completion of the service. Payment terms and cash received typically range from 30 to 90 days from the invoicing date. Historically, Ciena has not provided any material financing arrangements to its customers. As a practical expedient, Ciena does not adjust the amount of consideration it will receive for the effects of a significant financing component as it expects, at contract inception, that the period between Ciena’s transfer of the products or services to the customer and customer payment for the products or services will be one year or less. Shipping and handling fees invoiced to customers are included in revenue, with the associated expense included in product cost of goods sold. Ciena records revenue net of any associated sales taxes. Ciena recognizes revenue upon the transfer of control of promised products or services to a customer. Transfer of control occurs once the customer has the contractual right to use the product, generally upon shipment or delivery to the customer. Transfer of control can also occur over time for services such as software subscription, maintenance, installation, and various professional services as the customer receives the benefit over the contract term. Significant Judgments Revenue is allocated among performance obligations based on standalone selling price (“SSP”). SSP reflects the price at which Ciena would expect to sell that product or service on a stand-alone basis at contract inception and that Ciena would expect to be entitled to receive for the promised products or services. SSP is estimated for each distinct performance obligation, and judgment may be required in its determination. The best evidence of SSP is the observable price of a product or service when Ciena sells the products separately in similar circumstances and to similar customers. In instances where SSP is not directly observable, Ciena determines SSP using information that may include market conditions and other observable inputs. Ciena applies judgment in determining the transaction price, as Ciena may be required to estimate variable consideration when determining the amount of revenue to recognize. Variable consideration can include various rebate, cooperative marketing, and other incentive programs that Ciena offers to its distributors, partners and customers. When determining the amount of revenue to recognize, Ciena estimates the expected usage of these programs, applying the expected value or most likely estimate and updates the estimate at each reporting period as actual utilization data becomes available. Ciena also considers any customer right of return and any actual or potential payment of liquidated damages, contractual or similar penalties, or other claims for performance failures or delays in determining the transaction price, where applicable. When transfer of control is judged to be over time for installation and professional service arrangements, Ciena applies the input method to determine the amount of revenue to be recognized in a given period. Utilizing the input method, Ciena recognizes revenue based on the ratio of actual costs incurred to date to the total estimated costs expected to be incurred. Revenue for software subscription and maintenance is recognized ratably over the period during which the services are performed. Capitalized Contract Acquisition Costs Ciena has considered the impact of the guidance in Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 340-40, Other Assets and Deferred Costs; Contracts with Customers , and the interpretations of the FASB Transition Resource Group for Revenue Recognition with respect to capitalization and amortization of incremental costs of obtaining a contract. In conjunction with this interpretation, Ciena considers each customer purchase in combination with the corresponding framework agreement, if applicable, as a contract. Ciena has elected to implement the practical expedient, which allows for incremental costs to be recognized as an expense when incurred if the period of the asset recognition is one year or less. If the period of the asset recognition is greater than one year, Ciena amortizes these costs over the period of performance. Ciena considers sales commissions incurred upon receipt of purchase orders placed by customers as incremental costs to obtain such purchase orders. The practical expedient method is applied to the purchase order as a whole and thus the capitalized costs of obtaining a purchase order is applied even if the purchase order contains more than one performance obligation. In cases where a purchase order includes various distinct products or services with both short-term (one year or less) and long-term (more than a year) performance periods, the cost of commissions incurred for the total value of the purchase order is capitalized and subsequently amortized as each performance obligation is recognized.
Warranty Accruals	Ciena provides for the estimated costs to fulfill customer warranty obligations upon recognition of the related revenue. Estimated warranty costs include estimates for material costs, technical support labor costs and associated overhead. Warranty is included in cost of goods sold and is determined based on actual warranty cost experience, estimates of component failure rates and management’s industry experience. Ciena’s sales contracts do not permit the right of return of the product by the customer after the product has been accepted.
Allowance for Credit Losses for Accounts Receivable and Contract Assets	Ciena estimates its allowances for credit losses using relevant available information from internal and external sources, related to past events, current conditions and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. When assessing for credit losses, Ciena determines collectability by pooling assets with similar characteristics. The allowances for credit losses are each measured on a collective basis when similar risk characteristics exist. The allowances for credit losses are each measured by multiplying the exposure probability of default (the probability that the asset will default within a given time frame) by the loss given default rate (the percentage of the asset not expected to be collected due to default) based on the pool of assets. Probability of default rates are published by third-party credit rating agencies. Adjustments to Ciena’s exposure probability may take into account a number of factors, including, but not limited to, various customer-specific factors, the potential sovereign risk of the geographic locations in which the customer is operating and macroeconomic conditions. These factors are updated regularly or when facts and circumstances indicate that an update is deemed necessary. Accounts Receivable Factoring Ciena has entered into factoring agreements to sell certain receivables to unrelated third-party financial institution on a non-recourse basis. These transactions are accounted for in accordance with ASC Topic 860, “Transfers and Servicing” and result in a reduction in accounts receivable because the agreements transfer effective control over, and risk related to, the receivables to the buyers. Ciena's factoring agreements do not allow for recourse in the event of uncollectability, and Ciena does not retain any interest in the underlying accounts receivable once sold. Trade accounts receivables balances sold are removed from the consolidated balance sheets and cash received is reflected as cash provided by (used in) operating activities in the Consolidated Statements of Cash Flow. Factoring related interest expense is recorded to interest and other income (loss), net on the Consolidated Statements of Operations. See Note 9 below.
Research and Development	Ciena charges all research and development costs to expense as incurred. Types of expense incurred in research and development include employee compensation, prototype equipment, consulting and third-party services, depreciation, facility costs and information technology.
Government Grants	Ciena accounts for proceeds from government grants as a reduction of expense when there is reasonable assurance that Ciena has met the required conditions associated with the grant and that grant proceeds will be received. Grant benefits are recorded to the particular line item of the Consolidated Statement of Operations to which the grant activity relates.
Advertising Costs	Ciena expenses all advertising costs as incurred.
Legal Costs	Ciena expenses legal costs associated with litigation as incurred.
Share-Based Compensation Expense	Ciena measures and recognizes compensation expense for share-based awards and employee stock purchases related to its Amended and Restated 2003 Employee Stock Purchase Plan (the “ESPP”) based on estimated fair values on the date of grant. Ciena estimates the fair value of employee stock purchases related to the ESPP using the Black-Scholes option-pricing model. Ciena recognizes the estimated fair value of restricted stock units subject only to service-based vesting conditions by multiplying the number of shares underlying the award by the closing price per share of Ciena common stock on the grant date. In each case, Ciena only recognizes expense in its Consolidated Statements of Operations for those restricted stock units that ultimately vest. Awards with performance-based vesting conditions (i) require the achievement of certain operational, financial or other performance criteria or targets or (ii) vest based on Ciena’s total stockholder return as compared to an index of peer companies, in whole or in part. Ciena recognizes the estimated fair value of restricted stock units subject to performance-based vesting conditions other than total stockholder return by assuming the satisfaction of any performance-based objectives at the “target” level and multiplying the corresponding number of shares earned based upon such achievement by the closing price per share of Ciena common stock on the grant date. Ciena recognizes the estimated fair value of performance based awards subject to total stockholder return as compared to an index of peer companies using a Monte Carlo simulation valuation model on the date of grant. At the end of each reporting period, Ciena reassesses the probability of achieving the performance targets and the performance period required to meet those targets.
Stock Repurchase Program	Shares repurchased pursuant to Ciena’s stock repurchase program are immediately retired upon purchase. Repurchased common stock is reflected as a reduction of stockholders’ equity. Ciena’s accounting policy related to its share repurchases is to reduce its common stock based on the par value of the shares and to reduce its capital surplus for the excess of the repurchase price over the par value. Since the inception of its stock repurchase programs, Ciena has had an accumulated deficit balance; therefore, the excess over the par value has been applied to additional paid-in capital. Once Ciena has retained earnings, the excess will be charged entirely to retained earnings.
Income Taxes	Ciena accounts for income taxes using an asset and liability approach. This approach recognizes deferred tax assets and liabilities (“DTA”) for the expected future tax consequences attributable to differences between the carrying amounts of assets and liabilities for financial reporting purposes and their respective tax bases, and for operating loss and tax credit carryforwards. In estimating future tax consequences, Ciena considers all expected future events other than the enactment of changes in tax laws or rates. Valuation allowances are provided if, based on the weight of the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. In the ordinary course of business, transactions occur for which the ultimate outcome may be uncertain. In addition, tax authorities periodically audit Ciena’s income tax returns. These audits examine significant tax filing positions, including the timing and amounts of deductions and the allocation of income tax expenses among tax jurisdictions. Ciena is currently under audit in India for 2018 through 2021, in Canada for 2014, and in the United Kingdom for 2016 through 2021. Management does not expect the outcome of these audits to have a material adverse effect on Ciena’s consolidated financial position, results of operations or cash flows. Ciena’s major tax jurisdictions and the earliest open tax years are as follows: United States (2020), United Kingdom (2016), Canada (2014), and India (2018). Limited adjustments can be made to federal U.S. tax returns in earlier years in order to reduce net operating loss carryforwards. Ciena classifies interest and penalties related to uncertain tax positions as a component of income tax expense. Ciena is required to record excess tax benefits or tax deficiencies related to stock-based compensation as income tax benefit or expense when share-based awards vest or are settled. The Tax Cuts and Jobs Act (the “Tax Act”) includes provisions that affected Ciena starting in fiscal 2019, including a provision designed to tax global intangible low-taxed income (“GILTI”). An accounting policy choice is allowed to either treat taxes due on future U.S. inclusions related to GILTI in taxable income as a current-period expense when incurred (the “period cost method”) or factor such amounts into the measurement of deferred taxes (the “deferred method”). The calculation of the deferred balance with respect to the GILTI tax provisions will depend, in part, on analyzing global income to determine whether future U.S. inclusions in taxable income are expected related to GILTI and, if so, what the impact is expected to be. Ciena is electing to use the period cost method for future GILTI inclusions. Additionally, Ciena is electing to use the incremental cash tax savings approach when determining whether a valuation allowance needs to be recorded against the U.S. net operating loss (“NOL”) due to the GILTI inclusions. The Tax Act also introduced an alternative tax known as the base erosion and anti-abuse tax (“BEAT”). An accounting policy choice has been made to consider BEAT as a period cost when incurred.
Loss Contingencies	Ciena is subject to the possibility of various losses arising in the ordinary course of business. These may relate to disputes, litigation and other legal actions. Ciena considers the likelihood of loss or the incurrence of a liability, as well as Ciena’s ability to estimate the amount of loss reasonably, in determining loss contingencies. An estimated loss contingency is accrued when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. Ciena regularly evaluates current information available to it in order to determine whether any accruals should be adjusted and whether new accruals are required.
Fair Value of Financial Instruments	The carrying value of Ciena’s cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximates fair market value due to the relatively short period of time to maturity. For information related to the fair value of Ciena’s short-term and long-term debt, see Note 19 below. Fair value for the measurement of financial assets and liabilities is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. Ciena utilizes a valuation hierarchy for disclosure of the inputs for fair value measurement. This hierarchy prioritizes the inputs into three broad levels as follows: • Level 1 inputs are unadjusted quoted prices in active markets for identical assets or liabilities; • Level 2 inputs are quoted prices for identical or similar assets or liabilities in less active markets or model-derived valuations in which significant inputs are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument; and • Level 3 inputs are unobservable inputs based on Ciena’s assumptions used to measure assets and liabilities at fair value. The fair values are determined based on model-based techniques using inputs Ciena could not corroborated with market data. By distinguishing between inputs that are observable in the marketplace, and therefore more objective, and those that are unobservable, and therefore more subjective, the hierarchy is designed to indicate the relative reliability of the fair value measurements. A financial asset’s or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.
Restructuring	From time to time, Ciena takes actions to align its workforce, facilities and operating costs with perceived market opportunities, business strategies and changes in market and business conditions and redesign business processes. Ciena recognizes a liability for the cost associated with an exit or disposal activity in the period in which the liability is incurred, except for one-time employee termination benefits related to a service period, typically of more than 60 days, which are accrued over the service period.
Foreign Currency	Certain of Ciena’s foreign branch offices and subsidiaries use the U.S. Dollar as their functional currency because Ciena Corporation, as the U.S. parent entity, exclusively funds the operations of these branch offices and subsidiaries. For those subsidiaries using the local currency as their functional currency, assets and liabilities are translated at exchange rates in effect at the balance sheet date, and the statement of operations is translated at a monthly average rate. Resulting translation adjustments are recorded directly to a separate component of stockholders’ equity. Where the monetary assets and liabilities are transacted in a currency other than the entity’s functional currency, re-measurement adjustments are recorded in interest and other income (loss), net on the Consolidated Statements of Operations.
Derivatives	From time to time, Ciena uses foreign currency forward contracts to reduce variability in certain forecasted non-U.S. Dollar denominated cash flows. Generally, these derivatives have maturities of 24 months or less. Ciena also has interest rate swap arrangements to reduce variability in certain forecasted interest expense associated with its term loans. All of these derivatives are designated as cash flow hedges. Ciena also uses foreign currency forward contracts to minimize the effect of foreign exchange rate movements on is net investments in foreign operations. Generally, these derivatives have maturities of 24 months or less. These derivatives are designated as net investment hedges. At the inception of these hedges, and on an ongoing basis, Ciena assesses whether the derivative has been effective in offsetting changes attributable to the hedged risk during the hedging period. The derivative’s net gain or loss is initially reported as a component of accumulated other comprehensive loss, and upon occurrence of the forecasted transaction, is subsequently reclassified to the line item in the Consolidated Statements of Operations to which the hedged transaction relates. Ciena records derivative instruments in the Consolidated Statements of Cash Flows within operating, investing, or financing activities consistent with the cash flows of the hedged items.
Computation of Net Income per Share	Ciena calculates basic net income per common share (“Basic EPS”) by dividing earnings attributable to common stock by the weighted average number of common shares outstanding for the period. Diluted net income per potential common share (“Diluted EPS”) includes other potential dilutive shares that would be outstanding if securities or other contracts to issue common stock were exercised or converted into common stock. Ciena uses a dual presentation of Basic EPS and Diluted EPS on the face of its income statement. A reconciliation of the numerator and denominator used for the Basic EPS and Diluted EPS computations is set forth in Note 21 below.
Software Development Costs	Ciena develops software for sale to its customers. GAAP requires the capitalization of certain software development costs that are incurred subsequent to the date technological feasibility is established and prior to the date the product is generally available for sale. The capitalized cost is then amortized using the straight-line method over the estimated life of the product. Ciena defines technological feasibility as being attained at the time a working model is completed. To date, the period between Ciena achieving technological feasibility and the general availability of such software has been short, and software development costs qualifying for capitalization have been insignificant. Accordingly, Ciena has not capitalized any software development costs.
Newly Issued Accounting Standards - Not Yet 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 is effective for annual periods beginning after December 15, 2022 on a prospective basis. Early adoption is permitted. Ciena does not expect adoption of ASU 2021-08 to have a material impact on its consolidated financial statements and related disclosures. 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

REVENUE (Tables)

REVENUE (Tables)	12 Months Ended
	Oct. 28, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The tables below set forth Ciena’s disaggregated revenue for the respective period (in thousands): Year Ended October 28, 2023 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Optical Networking $ 2,987,245 $ — $ — $ — $ 2,987,245 Routing and Switching 506,247 — — — 506,247 Platform Software and Services — 303,873 — — 303,873 Blue Planet Automation Software and Services — — 69,170 — 69,170 Maintenance Support and Training — — — 288,334 288,334 Installation and Deployment — — — 180,951 180,951 Consulting and Network Design — — — 50,729 50,729 Total revenue by product line $ 3,493,492 $ 303,873 $ 69,170 $ 520,014 $ 4,386,549 Timing of revenue recognition: Products and services at a point in time $ 3,493,492 $ 67,013 $ 21,842 $ 55,036 $ 3,637,383 Products and services transferred over time — 236,860 47,328 464,978 749,166 Total revenue by timing of revenue recognition $ 3,493,492 $ 303,873 $ 69,170 $ 520,014 $ 4,386,549 Year Ended October 29, 2022 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Optical Networking $ 2,379,931 $ — $ — $ — $ 2,379,931 Routing and Switching 398,439 — — — 398,439 Platform Software and Services — 277,191 — — 277,191 Blue Planet Automation Software and Services — — 76,567 — 76,567 Maintenance Support and Training — — — 292,375 292,375 Installation and Deployment — — — 157,443 157,443 Consulting and Network Design — — — 50,715 50,715 Total revenue by product line $ 2,778,370 $ 277,191 $ 76,567 $ 500,533 $ 3,632,661 Timing of revenue recognition: Products and services at a point in time $ 2,778,370 $ 85,691 $ 25,540 $ 44,091 $ 2,933,692 Products and services transferred over time — 191,500 51,027 456,442 698,969 Total revenue by timing of revenue recognition $ 2,778,370 $ 277,191 $ 76,567 $ 500,533 $ 3,632,661 Year Ended October 30, 2021 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Optical Networking $ 2,553,509 $ — $ — $ — $ 2,553,509 Routing and Switching 271,796 — — — 271,796 Platform Software and Services — 229,588 — — 229,588 Blue Planet Automation Software and Services — — 77,247 — 77,247 Maintenance Support and Training — — — 283,350 283,350 Installation and Deployment — — — 171,489 171,489 Consulting and Network Design — — — 33,705 33,705 Total revenue by product line $ 2,825,305 $ 229,588 $ 77,247 $ 488,544 $ 3,620,684 Timing of revenue recognition: Products and services at a point in time $ 2,825,305 $ 80,359 $ 27,621 $ 14,923 $ 2,948,208 Products and services transferred over time — 149,229 49,626 473,621 672,476 Total revenue by timing of revenue recognition $ 2,825,305 $ 229,588 $ 77,247 $ 488,544 $ 3,620,684 For the periods below, Ciena’s geographic distribution of revenue was as follows (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Geographic distribution: Americas $ 3,110,347 $ 2,636,840 $ 2,525,619 EMEA 643,142 555,215 670,462 APAC 633,060 440,606 424,603 Total revenue by geographic distribution $ 4,386,549 $ 3,632,661 $ 3,620,684 For the periods below, the only customers that accounted for at least 10% of Ciena’s revenue were as follows (in thousands): October 28, 2023 October 29, 2022 October 30, 2021 Cloud Provider $ 561,397 n/a n/a AT&T 464,662 $ 433,418 $ 447,403 Verizon n/a 402,787 n/a Total $ 1,026,059 $ 836,205 $ 447,403 ________________________________ 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 October 28, 2023 Balance at October 29, 2022 Accounts receivable, net $ 1,003,876 $ 920,772 Contract assets for unbilled accounts receivable, net $ 150,312 $ 156,039 Deferred revenue $ 228,460 $ 200,235 As of the dates indicated, deferred revenue is comprised of the following (in thousands): October 28, 2023 October 29, 2022 Products $ 28,353 $ 19,814 Services 200,107 180,421 Total deferred revenue 228,460 200,235 Less current portion (154,419) (137,899) Long-term deferred revenue $ 74,041 $ 62,336

CANADIAN EMERGENCY WAGE SUBSI_2

CANADIAN EMERGENCY WAGE SUBSIDY (Tables)	12 Months Ended
	Oct. 28, 2023
Unusual or Infrequent Items, or Both [Abstract]
Schedule of Canadian Emergency Wage Subsidy	The following table summarizes CEWS for the period indicated (in thousands): Year Ended October 30, 2021 Product $ 4,283 Service 2,667 CEWS benefit in cost of goods sold 6,950 Research and development 29,519 Sales and marketing 2,604 General and administrative 2,207 CEWS benefit in operating expense 34,330 Total CEWS benefit $ 41,280

BUSINESS COMBINATIONS (Tables)

BUSINESS COMBINATIONS (Tables)	12 Months Ended
	Oct. 28, 2023
Business Combination and Asset Acquisition [Abstract]
Schedule of Acquired Assets and Assumed Liabilities	The following table summarizes the final purchase price allocation related to the acquisitions based on the estimated fair value of the acquired assets and assumed liabilities (in thousands): Amount Cash and cash equivalents $ 14,634 Accounts receivable, net 443 Inventories, net 1,406 Prepaid expenses and other 810 Equipment, furniture and fixtures 1,090 Goodwill 116,644 Developed technology 75,400 In-process technology 89,100 Customer relationships and contracts 18,400 Order backlog 2,480 Deferred tax asset, net (26,429) Accounts payable (420) Accrued liabilities and other short-term obligations (874) Deferred revenue (851) Other long-term obligations (144) Total purchase consideration $ 291,689 The following table summarizes the final purchase price allocation related to the acquisitions based on the estimated fair value of the acquired assets and assumed liabilities (in thousands): Amount Cash and cash equivalents $ 201 Prepaid expenses and other 1,614 Equipment, furniture and fixtures 694 Customer relationships and contracts 15,800 Developed technology 32,491 Goodwill 17,698 Accrued liabilities (4,434) Total purchase consideration $ 64,064

SIGNIFICANT ASSET IMPAIRMENT _2

SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS (Tables)	12 Months Ended
	Oct. 28, 2023
Restructuring and Related Activities [Abstract]
Schedule Of Activity and Balance of the Restructuring Liability Accounts	The following table sets forth the restructuring activity and balance of the restructuring liability accounts, which are included in accrued liabilities and other short-term obligations on Ciena’s Consolidated Balance Sheets, for the fiscal years indicated (in thousands): Workforce Other restructuring activities Total Balance at October 31, 2020 $ 2,915 $ — $ 2,915 Charges 5,938 (1) 23,627 (2) 29,565 Cash payments (8,072) (23,627) (31,699) Balance at October 30, 2021 781 — 781 Charges 3,156 (1) 26,814 (2) 29,970 Cash payments (2,722) (22,194) (24,916) Balance at October 29, 2022 1,215 4,620 5,835 Charges 6,885 (1) 16,949 (2) 23,834 Cash payments (6,187) (21,569) (27,756) Balance at October 28, 2023 $ 1,913 $ — $ 1,913 Current restructuring liabilities $ 1,913 $ — $ 1,913 _________________________________ (1) Reflects employee costs associated with workforce reductions 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 (LO_2

INTEREST AND OTHER INCOME (LOSS), NET (Tables)	12 Months Ended
	Oct. 28, 2023
Other Income and Expenses [Abstract]
Schedule of Interest and Other Income (Loss)	The components of interest and other income (loss), net, were as follows (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Interest income $ 45,011 $ 10,060 $ 2,051 Gains (losses) on non-hedge designated foreign currency forward contracts (3,896) (4,018) 11,172 Foreign currency exchange gains (losses) (427) 2,501 (14,622) Gain on cost method equity investments, net 26,368 4,120 164 Other (5,048) (5,916) (533) Interest and other income (loss), net $ 62,008 $ 6,747 $ (1,768)

CASH EQUIVALENT, SHORT-TERM A_2

CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS (Tables)	12 Months Ended
	Oct. 28, 2023
Investments, Debt and Equity Securities [Abstract]
Schedule of Short-term and Long-term Investments	As of the dates indicated, investments classified as available-for-sale are comprised of the following (in thousands): 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 October 29, 2022 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations $ 137,963 $ — $ (3,379) $ 134,584 Corporate debt securities 54,899 1 (405) 54,495 Time deposits 55,889 — (64) 55,825 $ 248,751 $ 1 $ (3,848) $ 244,904 Included in cash equivalents $ 55,530 $ — $ — $ 55,530 Included in short-term investments 156,430 1 (2,442) 153,989 Included in long-term investments 36,791 — (1,406) 35,385 $ 248,751 $ 1 $ (3,848) $ 244,904
Schedule of Legal Maturities of Debt Investments	The following table summarizes the legal maturities of debt investments at October 28, 2023 (in thousands): October 28, 2023 Amortized Cost Estimated Fair Less than one year $ 234,318 $ 234,029 Due in 1-2 years 134,455 134,278 $ 368,773 $ 368,307

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Oct. 28, 2023
Fair Value Disclosures [Abstract]
Schedule of Summary of the Fair Value of Assets and Liabilities Recorded on a Recurring Basis	As of the dates indicated, the following tables summarize the fair value of assets and liabilities that were recorded at fair value on a recurring basis (in thousands): 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 October 29, 2022 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 639,024 $ — $ — $ 639,024 Bond mutual fund 71,145 — — 71,145 Time deposits 55,825 — — 55,825 Deferred compensation plan assets 12,751 — — 12,751 U.S. government obligations — 134,584 — 134,584 Commercial paper — 54,495 — 54,495 Foreign currency forward contracts — 251 — 251 Interest rate swaps — 12,306 — 12,306 Total assets measured at fair value $ 778,745 $ 201,636 $ — $ 980,381 Liabilities: Foreign currency forward contracts $ — $ 15,605 $ — $ 15,605 Total liabilities measured at fair value $ — $ 15,605 $ — $ 15,605
Schedule of Assets and Liabilities are Presented on Ciena's Condensed Consolidated Balance Sheet	As of the dates indicated, the assets and liabilities above were presented on Ciena’s Consolidated Balance Sheets as follows (in thousands): 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 October 29, 2022 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 757,725 $ 7,974 $ — $ 765,699 Short-term investments 8,269 145,720 — 153,989 Prepaid expenses and other — 251 — 251 Long-term investments — 35,385 — 35,385 Other long-term assets 12,751 12,306 — 25,057 Total assets measured at fair value $ 778,745 $ 201,636 $ — $ 980,381 Liabilities: Accrued liabilities and other short-term obligations $ — $ 15,605 $ — $ 15,605 Total liabilities measured at fair value $ — $ 15,605 $ — $ 15,605

ACCOUNTS RECEIVABLE (Tables)

ACCOUNTS RECEIVABLE (Tables)	12 Months Ended
	Oct. 28, 2023
Receivables [Abstract]
Schedule of Activity in Allowance for Doubtful Accounts	The following table summarizes the activity in Ciena’s allowance for credit losses for the fiscal years indicated (in thousands): Year Ended Beginning Balance Effect of adoption of new accounting standard Provisions Net Deductions Ending Balance October 30, 2021 $ 10,598 $ 2,206 $ 2,346 $ 4,238 $ 10,912 October 29, 2022 (1) $ 10,912 $ — $ 4,199 $ 4,153 $ 10,958 October 28, 2023 $ 10,958 $ — $ 5,718 $ 5,022 $ 11,654 (1) On March 7, 2022, Ciena announced its decision to suspend its business operations in Russia immediately. As a result, Ciena’s allowance for doubtful accounts includes a provision for a significant asset impairment of $1.8 million for a trade receivable related to this decision.

INVENTORIES (Tables)

INVENTORIES (Tables)	12 Months Ended
	Oct. 28, 2023
Inventory Disclosure [Abstract]
Schedule of Inventories	As of the dates indicated, inventories are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Raw materials $ 664,797 $ 664,916 Work-in-process 55,242 18,232 Finished goods 314,168 258,584 Deferred cost of goods sold 66,634 41,084 Gross inventories 1,100,841 982,816 Reserve for excess and obsolescence (50,003) (36,086) Inventories, net $ 1,050,838 $ 946,730
Schedule of Activity in Reserve for Excess and Obsolete Inventory	The following table summarizes the activity in Ciena’s reserve for excess and obsolete inventory for the fiscal years indicated (in thousands): Year Ended Beginning Balance Provisions Disposals Ending Balance October 30, 2021 $ 39,637 $ 17,850 $ 20,528 $ 36,959 October 29, 2022 $ 36,959 $ 16,184 $ 17,057 $ 36,086 October 28, 2023 $ 36,086 $ 29,464 $ 15,547 $ 50,003

PREPAID EXPENSES AND OTHER (Tab

PREPAID EXPENSES AND OTHER (Tables)	12 Months Ended
	Oct. 28, 2023
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): October 28, 2023 October 29, 2022 Contract assets for unbilled accounts receivable, net $ 150,312 $ 156,039 Prepaid VAT and other taxes 96,724 63,975 Prepaid expenses 58,954 55,440 Product demonstration equipment, net 40,682 35,929 Capitalized contract acquisition costs 23,326 33,516 Other non-trade receivables 33,408 24,026 Deferred deployment expense 1,170 877 Derivative assets 1,118 251 $ 405,694 $ 370,053

EQUIPMENT, BUILDING, FURNITUR_2

EQUIPMENT, BUILDING, FURNITURE AND FIXTURES (Tables)	12 Months Ended
	Oct. 28, 2023
Property, Plant and Equipment [Abstract]
Schedule of Equipment, Building, Furniture and Fixtures	As of the dates indicated, equipment, building, furniture and fixtures are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Equipment, furniture and fixtures $ 676,485 $ 619,160 Building subject to finance lease 67,904 69,247 Leasehold improvements 74,391 80,415 Equipment, building, furniture and fixtures 818,780 768,822 Accumulated depreciation and amortization (538,633) (501,043) Equipment, building, furniture and fixtures, net $ 280,147 $ 267,779

INTANGIBLE ASSETS (Tables)

INTANGIBLE ASSETS (Tables)	12 Months Ended
	Oct. 28, 2023
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Schedule of Intangible Assets	As of the dates indicated, intangible assets are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Gross Accumulated Net Gross Accumulated Net Developed technology $ 503,618 $ (414,941) $ 88,677 $ 428,218 $ (386,300) $ 41,918 In-process research and development 89,100 — 89,100 — — — Patents and licenses 8,795 (5,203) 3,592 8,415 (4,228) 4,187 Customer relationships, covenants not to compete, outstanding purchase orders and contracts 410,983 (386,725) 24,258 390,271 (366,859) 23,412 Total intangible assets $ 1,012,496 $ (806,869) $ 205,627 $ 826,904 $ (757,387) $ 69,517
Schedule of Expected Future Amortization of Finite-lived Intangible Assets	Expected future amortization of intangible assets for the fiscal years indicated is as follows (in thousands): Fiscal Year Amount 2024 $ 40,601 2025 34,582 2026 23,348 2027 15,843 2028 1,991 Thereafter 162 (1) $ 116,527 (1) Does not include amortization of in-process technology, as estimation of the timing of future amortization expense would be impractical.

GOODWILL (Tables)

GOODWILL (Tables)	12 Months Ended
	Oct. 28, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill Allocated by Reportable Segments	The following table presents the goodwill allocated to Ciena’s operating segments as of October 28, 2023 and October 29, 2022 , as well as the changes to goodwill during fiscal 2023 (in thousands): Balance at October 29, 2022 Acquisitions Translation Balance at October 28, 2023 Platform Software and Services $ 156,191 $ — $ — $ 156,191 Blue Planet Automation Software and Services 89,049 — — 89,049 Networking Platforms 83,082 116,644 (201) 199,525 Total $ 328,322 $ 116,644 $ (201) $ 444,765

OTHER BALANCE SHEET DETAILS (Ta

OTHER BALANCE SHEET DETAILS (Tables)	12 Months Ended
	Oct. 28, 2023
Balance Sheet Related Disclosures [Abstract]
Schedule of Other Long-term Assets	As of the dates indicated, other long-term assets are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Maintenance spares inventory, net $ 54,042 $ 44,815 Interest rate swaps 24,953 12,306 Deferred compensation plan assets 11,456 12,751 Cloud computing arrangements (1) 8,589 6,050 Capitalized contract acquisition costs 6,879 6,151 Deferred debt issuance costs, net (2) 1,956 781 Restricted cash 168 26 Cost method equity investments (3) 48 20,698 Other 8,362 10,039 $ 116,453 $ 113,617 (1) During fiscal 2023, fiscal 2022 and fiscal 2021, Ciena recorded amortization of cloud computing arrangements of $2.6 million, $2.8 million and $2.4 million, respectively. (2) Deferred debt issuance costs relate to Ciena’s senior secured revolving credit facility (the “Revolving Credit Facility”) entered into during fiscal 2023 and its predecessor asset-backed credit facility (described in Note 20 below). The amortization of deferred debt issuance costs for the Revolving Credit Facility and its predecessor is included in interest expense, and was $0.4 million for fiscal 2023, fiscal 2022 and fiscal 2021. (3) During the first quarter of fiscal 2023, Ciena acquired its previously held cost method equity investment in Tibit in a business combination, see Note 4 above.
Schedule of Accrued Liabilities	As of the dates indicated, accrued liabilities and other short-term obligations are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Compensation, payroll related tax and benefits (1) $ 159,530 $ 126,338 Warranty 57,089 45,503 Vacation 29,503 26,396 Income taxes payable 16,341 11,472 Foreign currency forward contracts 14,509 15,604 Interest payable 4,514 4,793 Finance lease liabilities 3,953 3,758 Other 145,980 126,918 $ 431,419 $ 360,782 (1) Increase is primarily due to a higher accrual rate related to Ciena’s 2023 annual cash incentive compensation plan.
Schedule of Accrued Warranty	The following table summarizes the activity in Ciena’s accrued warranty for the fiscal years indicated (in thousands): Year Ended Beginning Balance Current Year Provisions Settlements Ending Balance October 30, 2021 $ 49,868 $ 17,093 $ (18,942) $ 48,019 October 29, 2022 $ 48,019 $ 17,440 $ (19,956) $ 45,503 October 28, 2023 $ 45,503 $ 31,742 $ (20,156) $ 57,089
Schedule of Deferred Revenue	The following table provides information about receivables, contract assets and contract liabilities (deferred revenue) from contracts with customers (in thousands): Balance at October 28, 2023 Balance at October 29, 2022 Accounts receivable, net $ 1,003,876 $ 920,772 Contract assets for unbilled accounts receivable, net $ 150,312 $ 156,039 Deferred revenue $ 228,460 $ 200,235 As of the dates indicated, deferred revenue is comprised of the following (in thousands): October 28, 2023 October 29, 2022 Products $ 28,353 $ 19,814 Services 200,107 180,421 Total deferred revenue 228,460 200,235 Less current portion (154,419) (137,899) Long-term deferred revenue $ 74,041 $ 62,336
Schedule of Other Liabilities	As of the dates indicated, other long-term obligations are comprised of the following (in thousands): October 28, 2023 October 29, 2022 Finance lease liabilities $ 48,192 $ 53,176 Income tax liability 98,259 72,644 Deferred compensation plan liability 11,444 12,535 Other 12,512 11,980 $ 170,407 $ 150,335

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	12 Months Ended
	Oct. 28, 2023
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table summarizes the changes in accumulated balances of other comprehensive income (“AOCI”), net of tax (in thousands): Unrealized Gain (Loss) on Available-for-Sale Securities Foreign Interest Rate Swaps Cumulative Translation Adjustment Total Balance at October 31, 2020 $ 45 $ (219) $ (21,535) $ (13,649) $ (35,358) Other comprehensive gain (loss) before reclassifications (209) 16,856 (261) 20,215 36,601 Amounts reclassified from AOCI — (10,421) 9,617 — (804) Balance at October 30, 2021 (164) 6,216 (12,179) 6,566 439 Other comprehensive gain (loss) before reclassifications (2,801) (16,299) 14,512 (49,446) (54,034) Amounts reclassified from AOCI — (114) 7,064 — 6,950 Balance at October 29, 2022 (2,965) (10,197) 9,397 (42,880) (46,645) Other comprehensive gain (loss) before reclassifications 2,593 (8,455) 19,600 (5,321) 8,417 Amounts reclassified from AOCI — 10,496 (10,035) — 461 Balance at October 28, 2023 $ (372) $ (8,156) $ 18,962 $ (48,201) $ (37,767)

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Oct. 28, 2023
Leases [Abstract]
Schedule of Leases Included in Balance Sheet	Leases included in the Consolidated Balance Sheets for the fiscal periods indicated were as follows (in thousands): Classification Balance at October 28, 2023 Balance at October 29, 2022 Operating leases: Operating ROU Assets Operating right-of-use assets $ 35,140 $ 45,108 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities $ 49,914 $ 61,317 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 67,904 $ 69,247 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (30,079) (26,266) Buildings, net $ 37,825 $ 42,981 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 52,145 $ 56,934
Schedule of Components of Lease Expense	For the periods indicated, the components of lease expense included in the Consolidated Statements of Operations were as follows (in thousands): Year Ended Year Ended Year Ended Classification October 28, 2023 October 29, 2022 October 30, 2021 Operating lease costs Operating expense $ 16,080 $ 17,966 $ 16,602 Finance lease cost: Amortization of finance ROU asset Operating expense 4,448 4,592 4,773 Interest on finance lease liabilities Interest expense 4,069 4,601 4,882 Total finance lease cost 8,517 9,193 9,655 Non-capitalized lease cost Operating expense 910 917 1,152 Variable lease cost (1) Operating expense 3,421 5,898 5,690 Net lease cost (2) $ 28,928 $ 33,974 $ 33,099 (1) Variable lease costs include expenses relating to insurance, taxes, maintenance and other costs required by the applicable operating lease. Variable lease costs are determined by whether they are to be included in base rent and if amounts are based on a consumer price index. (2) Excludes other operating expense of $6.5 million, $12.8 million, and $8.8 million for the fiscal years ended October 28, 2023, October 29, 2022 , and October 30, 2021, respectively, related to amortization of leasehold improvements. The weighted average remaining lease terms and weighted average discount rates for operating and finance leases were as follows (in thousands): Weighted-average remaining lease term in years: As of October 28, 2023 As of October 29, 2022 Operating leases 4.07 3.85 Finance leases 8.71 9.71 Weighted-average discount rates: Operating leases 3.88 % 2.97 % Finance leases 7.56 % 7.56 %
Schedule of Future Minimum Lease Payments, Operating Lease	Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of October 28, 2023 were as follows (in thousands): Operating Leases Finance Leases Total 2024 $ 18,126 $ 7,640 $ 25,766 2025 13,568 7,793 21,361 2026 9,951 7,824 17,775 2027 5,563 8,095 13,658 2028 1,516 8,367 9,883 Thereafter 5,796 31,435 37,231 Total lease payments 54,520 71,154 125,674 Less: Imputed interest (4,606) (19,009) (23,615) Present value of lease liabilities 49,914 52,145 102,059 Less: Current portion of present value of minimum lease payments 16,655 3,953 20,608 Long-term portion of present value of minimum lease payments $ 33,259 $ 48,192 $ 81,451
Schedule of Future Minimum Lease Payments, Finance Lease	Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of October 28, 2023 were as follows (in thousands): Operating Leases Finance Leases Total 2024 $ 18,126 $ 7,640 $ 25,766 2025 13,568 7,793 21,361 2026 9,951 7,824 17,775 2027 5,563 8,095 13,658 2028 1,516 8,367 9,883 Thereafter 5,796 31,435 37,231 Total lease payments 54,520 71,154 125,674 Less: Imputed interest (4,606) (19,009) (23,615) Present value of lease liabilities 49,914 52,145 102,059 Less: Current portion of present value of minimum lease payments 16,655 3,953 20,608 Long-term portion of present value of minimum lease payments $ 33,259 $ 48,192 $ 81,451

SHORT-TERM AND LONG-TERM DEBT (

SHORT-TERM AND LONG-TERM DEBT (Tables)	12 Months Ended
	Oct. 28, 2023
Debt Disclosure [Abstract]
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	The net carrying value of the 2030 New Term Loan was comprised of the following as of the date indicated (in thousands): October 28, 2023 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value 2030 New Term Loan $ 1,170,000 $ (5,122) $ (5,507) $ 1,159,371 The net carrying value of the 2030 Notes was comprised of the following for the period indicated (in thousands): October 28, 2023 October 29, 2022 Principal Balance Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2030 Senior Notes 4.00% fixed-rate $ 400,000 $ (4,265) $ 395,735 $ 395,045

EARNINGS PER SHARE CALCULATION

EARNINGS PER SHARE CALCULATION (Tables)	12 Months Ended
	Oct. 28, 2023
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 (in thousands except per share amounts): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Net income $ 254,827 $ 152,902 $ 500,196 Basic weighted average shares outstanding 148,971 151,208 155,279 Effect of dilutive potential common shares 409 985 1,464 Diluted weighted average shares outstanding 149,380 152,193 156,743 Basic EPS $ 1.71 $ 1.01 $ 3.22 Diluted EPS $ 1.71 $ 1.00 $ 3.19 Antidilutive employee share-based awards, excluded 2,675 1,370 110

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Oct. 28, 2023
Income Tax Disclosure [Abstract]
Schedule of Provision (Benefit) for Income Taxes	For the periods indicated, the provision (benefit) for income taxes consists of the following (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Provision (benefit) for income taxes: Current: Federal $ 36,537 $ 27,479 $ 72,603 State 18,860 10,289 21,400 Foreign 28,281 19,337 25,021 Total current 83,678 57,105 119,024 Deferred: Federal (8,010) (30,032) (21,942) State (17,354) 520 (11,546) Foreign 10,512 2,010 (122,981) Total deferred (14,852) (27,502) (156,469) Provision (benefit) for income taxes $ 68,826 $ 29,603 $ (37,445)
Schedule of Income before Provision (Benefit) for Income Taxes	For the periods indicated, income before provision (benefit) for income taxes consists of the following (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 United States $ 93,682 $ 28,784 $ 298,514 Foreign 229,971 153,721 164,237 Total $ 323,653 $ 182,505 $ 462,751
Schedule of Tax Provision (Benefit) Reconciles to the Amount Computed by Multiplying Income or Loss Before Income Taxes by the U.S. Federal Statutory Rate of 35%	For the periods indicated, the tax provision reconciles to the amount computed by multiplying income before income taxes by the U.S. federal statutory rate of 21% for fiscal 2023, fiscal 2022 and fiscal 2021 as follows: Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Provision at statutory rate 21.00 % 21.00 % 21.00 % Intercompany IP Restructuring Transaction — % — % (25.85) % State taxes 1.65 % 2.31 % 3.73 % Withholding and other foreign taxes (0.09) % (1.37) % 2.76 % Research and development credit (16.78) % (23.66) % (7.99) % Non-deductible compensation 5.29 % 5.26 % 1.68 % Foreign derived intangible income — % — % (1.82) % US Taxation on foreign activity 5.08 % 1.73 % — % Foreign Nontaxable interest (1.06) % (1.90) % — % Taxation on foreign inflation 1.34 % 1.41 % 0.16 % Rate change (3.71) % 1.27 % (4.33) % Valuation allowance 9.44 % 8.35 % 1.77 % Loss on equity transactions (1.72) % — % — % Uncertain tax positions 1.72 % 1.62 % 0.63 % Other (0.89) % 0.20 % 0.17 % Effective income tax rate 21.27 % 16.22 % (8.09) %
Schedule of Significant Components of Deferred Tax Assets and Liabilities	The significant components of deferred tax assets are as follows (in thousands): Year Ended October 28, 2023 October 29, 2022 Deferred tax assets: Reserves and accrued liabilities $ 82,160 $ 76,839 Depreciation and amortization 712,098 690,636 NOL and credit carry forward 197,984 154,707 Other 6,934 63,902 Gross deferred tax assets 999,176 986,084 Valuation allowance (189,870) (162,076) Deferred tax asset, net of valuation allowance $ 809,306 $ 824,008
Schedule of Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits, excluding Interest and Penalties	A reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest and penalties, is as follows (in thousands): Amount Unrecognized tax benefits at October 31, 2020 $ 95,748 Decrease related to positions taken in prior period (22,854) Reductions related to settlements with taxing authorities (654) Increase related to positions taken in current period 5,510 Reductions related to expiration of statute of limitations (659) Unrecognized tax benefits at October 30, 2021 77,091 Increase related to positions taken in prior period 4,732 Reductions related to settlements with taxing authorities (3,229) Increase related to positions taken in current period 2,959 Reductions related to expiration of statute of limitations (1,039) Unrecognized tax benefits at October 29, 2022 80,514 Increase related to positions taken in prior period 9,940 Reductions related to settlements with taxing authorities (625) Increase related to positions taken in current period 4,960 Reductions related to expiration of statute of limitations (869) Unrecognized tax benefits at October 28, 2023 $ 93,920
Schedule of Valuation Allowance Against the Gross Deferred Tax Assets	The following table summarizes the activity in Ciena’s valuation allowance against its gross deferred tax assets (in thousands): Year Ended Beginning Balance Additions Deductions Ending Balance October 30, 2021 $ 151,427 $ 17,897 $ 9,690 $ 159,634 October 29, 2022 $ 159,634 $ 15,245 $ 12,803 $ 162,076 October 28, 2023 $ 162,076 $ 28,746 $ 952 $ 189,870

SHARE-BASED COMPENSATION EXPE_2

SHARE-BASED COMPENSATION EXPENSE (Tables)	12 Months Ended
	Oct. 28, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Stock Option Activity	The following table is a summary of Ciena’s stock option activity for the periods indicated (shares in thousands): Shares Weighted Balance at October 29, 2022 32 $ 30.98 Granted — — Exercised (22) $ 33.98 Canceled (3) $ 45.32 Balance at October 28, 2023 7 $ 16.94
Schedule of Information with Respect to Stock Options Outstanding	The following table summarizes information with respect to stock options outstanding at October 28, 2023 , based on Ciena’s closing stock price on the last trading day of Ciena’s fiscal 2023 (shares and intrinsic value in thousands): Options Outstanding and Vested at October 28, 2023 Number Weighted Weighted Range of of Contractual Average Aggregate Exercise Underlying Life Exercise Intrinsic Price Shares (Years) Price Value $ 14.38 — $ 18.22 7 0.36 $ 16.94 $ 178
Schedule of Assumptions for Awards Granted	Assumptions for awards granted during fiscal 2023, fiscal 2022 and fiscal 2021 included the following: Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Expected volatility of Ciena common stock, which is a weighted average of implied volatility and historical volatility 40.37% 38.27% 41.00% Historical volatility of Ciena common stock 43.11% 42.17% 42.80% Historical volatility of S&P Networking Index 30.93% 27.22% 27.30% Correlation coefficient 0.7781 0.7049 0.6800 Expected life in years 2.89 2.89 2.87 Risk-free interest rate 3.95% 0.94% 0.17% Expected dividend yield 0.0% 0.0% 0.0%
Schedule of Restricted Stock Unit Activity	The following table is a summary of Ciena’s restricted stock unit activity for the period indicated, with the aggregate fair value of the balance outstanding at the end of each period, based on Ciena’s closing stock price on the last trading day of the relevant period (shares and aggregate fair value in thousands): Restricted Weighted Aggregate Fair Balance at October 29, 2022 4,103 $ 55.16 $ 197,960 Granted 3,301 Vested (2,067) Canceled or forfeited (415) Balance at October 28, 2023 4,922 $ 53.42 $ 201,916
Schedule of Share-based Compensation Expense	The following table summarizes share-based compensation expense for the periods indicated (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Products $ 4,518 $ 3,867 $ 3,408 Services 10,470 7,533 5,181 Share-based compensation expense included in cost of goods sold 14,988 11,400 8,589 Research and development 42,331 31,879 21,863 Sales and marketing 35,136 31,280 25,152 General and administrative 37,587 30,435 28,804 Share-based compensation expense included in operating expense 115,054 93,594 75,819 Share-based compensation expense capitalized in inventory, net 413 137 (72) Total share-based compensation $ 130,455 $ 105,131 $ 84,336

SEGMENT AND ENTITY WIDE DISCL_2

SEGMENT AND ENTITY WIDE DISCLOSURES (Tables)	12 Months Ended
	Oct. 28, 2023
Segment Reporting [Abstract]
Schedule of Reconciliation of Assets from Segment to Consolidated	As of October 28, 2023 , finite-lived intangible assets, goodwill and maintenance spares are assigned to asset groups within the following segments (in thousands): October 28, 2023 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Other intangible assets, net $ 188,383 $ — $ 17,244 $ — $ 205,627 Goodwill $ 199,525 $ 156,191 $ 89,049 $ — $ 444,765 Maintenance spares, net $ — $ — $ — $ 54,042 $ 54,042
Schedule of Segment Profit (Loss) and the Reconciliation to Consolidated Net Income (Loss)	The table below sets forth Ciena’s segment profit (loss) and the reconciliation to consolidated net income for the respective periods indicated (in thousands): Year Ended October 28, 2023 October 29, 2022 October 30, 2021 Segment profit (loss): Networking Platforms $ 778,641 $ 572,305 $ 850,901 Platform Software and Services 186,945 175,108 136,602 Blue Planet Automation Software and Services (33,669) (22,388) (711) Global Services 196,375 210,663 198,521 Total segment profit 1,128,292 935,688 1,185,313 Less: non-performance operating expenses Selling and marketing 490,804 466,565 452,214 General and administrative 215,284 179,382 181,874 Significant asset impairments and restructuring costs 23,834 33,824 29,565 Amortization of intangible assets 37,351 32,511 23,732 Acquisition and integration costs 3,474 598 2,572 Add: other non-performance financial items Interest and other income (loss), net 62,008 6,747 (1,768) Interest expense (88,026) (47,050) (30,837) Loss on extinguishment and modification of debt (7,874) — — Less: Provision (benefit) for income taxes 68,826 29,603 (37,445) Consolidated net income $ 254,827 $ 152,902 $ 500,196
Schedule of Ciena's Geographic Distribution of Revenue and Long-lived Assets	For the periods below, Ciena’s geographic distribution of equipment, building, furniture and fixtures, net, and operating ROU assets was as follows (in thousands): October 28, 2023 October 29, 2022 Canada $ 229,707 $ 226,451 United States 46,933 47,515 Other International 38,647 38,921 Total $ 315,287 $ 312,887

CIENA CORPORATION AND SIGNIFI_3

CIENA CORPORATION AND SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES - Narrative (Details)	12 Months Ended
	Oct. 28, 2023
Significant Accounting Policies [Line Items]
Expected economic lives of finite-lived intangible assets (in years)	7 years
Expected number of years Spares usage cost is expensed	4 years
One-time employee termination benefits related to service period (in days)	60 days
Minimum
Significant Accounting Policies [Line Items]
Payment terms and cash received	30 days
Maximum
Significant Accounting Policies [Line Items]
Payment terms and cash received	90 days
Foreign exchange contract maturities	24 months
Equipment, furniture and fixtures | Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	3 years
Equipment, furniture and fixtures | Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	5 years
Software and website development | Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	2 years
Software and website development | Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	5 years

REVENUE - Disaggregation of Rev

REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 4,386,549	$ 3,632,661	$ 3,620,684
Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	3,637,383	2,933,692	2,948,208
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	749,166	698,969	672,476
Optical Networking
Disaggregation of Revenue [Line Items]
Total revenue	2,987,245	2,379,931	2,553,509
Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	506,247	398,439	271,796
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	303,873	277,191	229,588
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	69,170	76,567	77,247
Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	288,334	292,375	283,350
Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	180,951	157,443	171,489
Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	50,729	50,715	33,705
Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	3,493,492	2,778,370	2,825,305
Networking Platforms | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	3,493,492	2,778,370	2,825,305
Networking Platforms | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Networking Platforms | Optical Networking
Disaggregation of Revenue [Line Items]
Total revenue	2,987,245	2,379,931	2,553,509
Networking Platforms | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	506,247	398,439	271,796
Networking Platforms | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Networking Platforms | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Networking Platforms | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Networking Platforms | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Networking Platforms | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	303,873	277,191	229,588
Platform Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	67,013	85,691	80,359
Platform Software and Services | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	236,860	191,500	149,229
Platform Software and Services | Optical Networking
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Platform Software and Services | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Platform Software and Services | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	303,873	277,191	229,588
Platform Software and Services | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Platform Software and Services | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Platform Software and Services | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Platform Software and Services | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	69,170	76,567	77,247
Blue Planet Automation Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	21,842	25,540	27,621
Blue Planet Automation Software and Services | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	47,328	51,027	49,626
Blue Planet Automation Software and Services | Optical Networking
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Blue Planet Automation Software and Services | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Blue Planet Automation Software and Services | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Blue Planet Automation Software and Services | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	69,170	76,567	77,247
Blue Planet Automation Software and Services | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Blue Planet Automation Software and Services | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Blue Planet Automation Software and Services | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Global Services
Disaggregation of Revenue [Line Items]
Total revenue	520,014	500,533	488,544
Global Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	55,036	44,091	14,923
Global Services | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	464,978	456,442	473,621
Global Services | Optical Networking
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Global Services | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Global Services | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Global Services | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Global Services | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	288,334	292,375	283,350
Global Services | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	180,951	157,443	171,489
Global Services | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	$ 50,729	$ 50,715	$ 33,705

REVENUE - Geographical Distribu

REVENUE - Geographical Distribution of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 4,386,549	$ 3,632,661	$ 3,620,684
Americas
Disaggregation of Revenue [Line Items]
Total revenue	3,110,347	2,636,840	2,525,619
EMEA
Disaggregation of Revenue [Line Items]
Total revenue	643,142	555,215	670,462
APAC
Disaggregation of Revenue [Line Items]
Total revenue	$ 633,060	$ 440,606	$ 424,603

REVENUE - Revenue by Major Cust

REVENUE - Revenue by Major Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Revenue, Major Customer [Line Items]
Total revenue	$ 4,386,549	$ 3,632,661	$ 3,620,684
Cloud Provider | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue	561,397
AT&T | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue	464,662	433,418	447,403
Verizon | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue		402,787
Total | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue	$ 1,026,059	$ 836,205	$ 447,403

REVENUE - Contract Balances (De

REVENUE - Contract Balances (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 1,003,876	$ 920,772
Contract assets for unbilled accounts receivable, net	150,312	156,039
Deferred revenue	$ 228,460	$ 200,235

REVENUE - Narrative (Details)

REVENUE - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Revenue from External Customer [Line Items]
Revenues	$ 4,386,549	$ 3,632,661	$ 3,620,684
Revenue recognized that was previously deferred	135,500	111,300
Capitalized contract acquisition costs	30,200	39,700
Amortization of capitalized contract acquisition costs	34,200	$ 27,300
Remaining performance obligation	$ 1,800,000
Ten Largest Customers | Revenue | Customer Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk, percentage	53.70%	56.30%	55.50%
United States
Revenue from External Customer [Line Items]
Revenues	$ 2,800,000	$ 2,400,000	$ 2,300,000

REVENUE - Performance Obligatio

REVENUE - Performance Obligation (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-29	Oct. 28, 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of remaining performance obligation	81%
Period of remaining performance obligation	12 months

CANADIAN EMERGENCY WAGE SUBSI_3

CANADIAN EMERGENCY WAGE SUBSIDY - Narrative (Details) $ in Thousands, $ in Millions	12 Months Ended
	Oct. 30, 2021 CAD ($)	Oct. 30, 2021 USD ($)	Oct. 31, 2020 CAD ($)	Oct. 31, 2020 USD ($)
Canadian Emergency Wage Subsidy
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit	$ 52.2	$ 41,280
Grants, Canada Emergency Wage Subsidy, 2020 Employee Wages
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit			$ 43.9	$ 35,400

CANADIAN EMERGENCY WAGE SUBSI_4

CANADIAN EMERGENCY WAGE SUBSIDY - Canadian Emergency Wage Subsidy (Details) - 12 months ended Oct. 30, 2021 - Canadian Emergency Wage Subsidy $ in Thousands, $ in Millions	CAD ($)	USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit	$ 52.2	$ 41,280
Product
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		4,283
Service
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		2,667
CEWS benefit in cost of goods sold
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		6,950
Research and development
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		29,519
Sales and marketing
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		2,604
General and administrative
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		2,207
CEWS benefit in operating expense
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		$ 34,330

BUSINESS COMBINATIONS - Narrati

BUSINESS COMBINATIONS - Narrative (Details) - USD ($) $ in Thousands				3 Months Ended	12 Months Ended
	Dec. 30, 2022	Mar. 09, 2022	Nov. 01, 2021	Jan. 28, 2023	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Business Acquisition [Line Items]
Gain on cost method equity investment					$ 26,368	$ 4,120	$ 164
Acquisition and integration costs					3,474	$ 598	$ 2,572
Benu and Tibit
Business Acquisition [Line Items]
Consideration transferred	$ 291,700
Payment to acquire business	244,700
Fair value of previously held cost method equity investment	47,000
Gain on cost method equity investment	26,500			$ 26,500
Acquisition and integration costs	$ 3,400
Benu and Tibit | Developed technology
Business Acquisition [Line Items]
Intangible assets, useful life	5 years
Benu and Tibit | Customer relationships and contracts
Business Acquisition [Line Items]
Intangible assets, useful life	3 years
Vyatta And Xelic
Business Acquisition [Line Items]
Consideration transferred		$ 64,100
Payment to acquire business		63,300
Acquisition and integration costs					$ 1,700
Future payable arrangement		$ 800
Vyatta And Xelic | Developed technology
Business Acquisition [Line Items]
Intangible assets, useful life			5 years
Vyatta And Xelic | Customer relationships and contracts
Business Acquisition [Line Items]
Intangible assets, useful life			2 years

BUSINESS COMBINATIONS - Purchas

BUSINESS COMBINATIONS - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Dec. 30, 2022	Oct. 29, 2022	Nov. 01, 2021
Business Acquisition [Line Items]
Goodwill	$ 444,765		$ 328,322
Benu and Tibit
Business Acquisition [Line Items]
Cash and cash equivalents		$ 14,634
Accounts receivable, net		443
Inventories, net		1,406
Prepaid expenses and other		810
Equipment, furniture and fixtures		1,090
Goodwill		116,644
Deferred tax asset, net		(26,429)
Accounts payable		(420)
Accrued liabilities and other short-term obligations		(874)
Deferred revenue		(851)
Other long-term obligations		(144)
Total purchase consideration		291,689
Benu and Tibit | Developed technology
Business Acquisition [Line Items]
Intangible assets		75,400
Benu and Tibit | In-process technology
Business Acquisition [Line Items]
Intangible assets		89,100
Benu and Tibit | Customer relationships and contracts
Business Acquisition [Line Items]
Intangible assets		18,400
Benu and Tibit | Order backlog
Business Acquisition [Line Items]
Intangible assets		$ 2,480
Vyatta And Xelic
Business Acquisition [Line Items]
Cash and cash equivalents				$ 201
Prepaid expenses and other				1,614
Equipment, furniture and fixtures				694
Goodwill				17,698
Accrued liabilities and other short-term obligations				(4,434)
Total purchase consideration				64,064
Vyatta And Xelic | Developed technology
Business Acquisition [Line Items]
Intangible assets				32,491
Vyatta And Xelic | Customer relationships and contracts
Business Acquisition [Line Items]
Intangible assets				$ 15,800

SIGNIFICANT ASSET IMPAIRMENT _3

SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Activity and balance of the restructuring liability accounts
Balance at beginning of period	$ 5,835	$ 781	$ 2,915
Charges	23,834	29,970	29,565
Cash payments	(27,756)	(24,916)	(31,699)
Balance at end of period	1,913	5,835	781
Current restructuring liabilities	1,913
Workforce reduction
Activity and balance of the restructuring liability accounts
Balance at beginning of period	1,215	781	2,915
Charges	6,885	3,156	5,938
Cash payments	(6,187)	(2,722)	(8,072)
Balance at end of period	1,913	1,215	781
Current restructuring liabilities	1,913
Other restructuring activities
Activity and balance of the restructuring liability accounts
Balance at beginning of period	4,620	0	0
Charges	16,949	26,814	23,627
Cash payments	(21,569)	(22,194)	(23,627)
Balance at end of period	0	$ 4,620	$ 0
Current restructuring liabilities	$ 0

SIGNIFICANT ASSET IMPAIRMENT _4

SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS - Narrative (Details) $ in Millions	Mar. 07, 2022 USD ($)
Restructuring and Related Activities [Abstract]
Asset impairment charges	$ 3.8
Provision for other credit losses	$ 1.8

INTEREST AND OTHER INCOME (LO_3

INTEREST AND OTHER INCOME (LOSS), NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Other Income and Expenses [Abstract]
Interest income	$ 45,011	$ 10,060	$ 2,051
Gains (losses) on non-hedge designated foreign currency forward contracts	(3,896)	(4,018)	11,172
Foreign currency exchange gains (losses)	(427)	2,501	(14,622)
Gain on cost method equity investments, net	26,368	4,120	164
Other	(5,048)	(5,916)	(533)
Interest and other income (loss), net	$ 62,008	$ 6,747	$ (1,768)

CASH EQUIVALENT, SHORT-TERM A_3

CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS - Short-term and Long-term Investments (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 368,773	$ 248,751
Gross Unrealized Gains	33	1
Gross Unrealized Losses	(499)	(3,848)
Estimated Fair Value	368,307	244,904
Included in cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	129,276	55,530
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	129,276	55,530
Included in short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	105,042	156,430
Gross Unrealized Gains	4	1
Gross Unrealized Losses	(293)	(2,442)
Estimated Fair Value	104,753	153,989
Included in long-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	134,455	36,791
Gross Unrealized Gains	29	0
Gross Unrealized Losses	(206)	(1,406)
Estimated Fair Value	134,278	35,385
U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	170,260	137,963
Gross Unrealized Gains	28	0
Gross Unrealized Losses	(379)	(3,379)
Estimated Fair Value	169,909	134,584
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	59,683	54,899
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(115)	(405)
Estimated Fair Value	59,569	54,495
Time deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	138,830	55,889
Gross Unrealized Gains	4	0
Gross Unrealized Losses	(5)	(64)
Estimated Fair Value	$ 138,829	$ 55,825

CASH EQUIVALENT, SHORT-TERM A_4

CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS - Legal Maturities of Debt Investments (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Amortized Cost
Less than one year	$ 234,318
Due in 1-2 years	134,455
Amortized Cost	368,773	$ 248,751
Estimated Fair Value
Less than one year	234,029
Due in 1-2 years	134,278
Estimated Fair Value	$ 368,307	$ 244,904

FAIR VALUE MEASUREMENTS - Fair

FAIR VALUE MEASUREMENTS - Fair Value Measurements (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Assets:
Debt securities	$ 368,307	$ 244,904
Forward starting interest rate swaps
Liabilities:
Derivative liability	24,953	12,306
Corporate debt securities
Assets:
Debt securities	59,569	54,495
Fair Value, Measurements, Recurring
Assets:
Deferred compensation plan assets	11,456	12,751
Total assets measured at fair value	1,171,107	980,381
Liabilities:
Total liabilities measured at fair value	14,509	15,605
Fair Value, Measurements, Recurring | Foreign currency forward contracts
Assets:
Foreign currency forward contracts	1,119	251
Liabilities:
Derivative liability	14,509	15,605
Fair Value, Measurements, Recurring | Bond mutual fund
Assets:
Debt securities	104,171	71,145
Fair Value, Measurements, Recurring | U.S. government obligations
Assets:
Debt securities	169,909	134,584
Fair Value, Measurements, Recurring | Corporate debt securities
Assets:
Debt securities	59,569
Fair Value, Measurements, Recurring | Commercial paper
Assets:
Debt securities		54,495
Level 1 | Forward starting interest rate swaps
Liabilities:
Derivative liability	0	0
Level 1 | Fair Value, Measurements, Recurring
Assets:
Deferred compensation plan assets	11,456	12,751
Total assets measured at fair value	915,557	778,745
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 | Bond mutual fund
Assets:
Debt securities	104,171	71,145
Level 1 | Fair Value, Measurements, Recurring | U.S. government obligations
Assets:
Debt securities	0	0
Level 1 | Fair Value, Measurements, Recurring | Corporate debt securities
Assets:
Debt securities	0
Level 1 | Fair Value, Measurements, Recurring | Commercial paper
Assets:
Debt securities		0
Level 2 | Forward starting interest rate swaps
Liabilities:
Derivative liability	24,953	12,306
Level 2 | Fair Value, Measurements, Recurring
Assets:
Deferred compensation plan assets	0	0
Total assets measured at fair value	255,550	201,636
Liabilities:
Total liabilities measured at fair value	14,509	15,605
Level 2 | Fair Value, Measurements, Recurring | Foreign currency forward contracts
Assets:
Foreign currency forward contracts	1,119	251
Liabilities:
Derivative liability	14,509	15,605
Level 2 | Fair Value, Measurements, Recurring | Bond mutual fund
Assets:
Debt securities	0	0
Level 2 | Fair Value, Measurements, Recurring | U.S. government obligations
Assets:
Debt securities	169,909	134,584
Level 2 | Fair Value, Measurements, Recurring | Corporate debt securities
Assets:
Debt securities	59,569
Level 2 | Fair Value, Measurements, Recurring | Commercial paper
Assets:
Debt securities		54,495
Level 3 | Forward starting interest rate swaps
Liabilities:
Derivative liability	0	0
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 | Bond mutual fund
Assets:
Debt securities	0	0
Level 3 | Fair Value, Measurements, Recurring | U.S. government obligations
Assets:
Debt securities	0	0
Level 3 | Fair Value, Measurements, Recurring | Corporate debt securities
Assets:
Debt securities	0
Level 3 | Fair Value, Measurements, Recurring | Commercial paper
Assets:
Debt securities		0
Money market funds | Fair Value, Measurements, Recurring
Assets:
Cash equivalents	661,101	639,024
Money market funds | Level 1 | Fair Value, Measurements, Recurring
Assets:
Cash equivalents	661,101	639,024
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	138,829	55,825
Time deposits | Level 1 | Fair Value, Measurements, Recurring
Assets:
Cash equivalents	138,829	55,825
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 - Balan

FAIR VALUE MEASUREMENTS - Balance Sheet Items (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Assets:
Total assets measured at fair value	$ 1,171,107	$ 980,381
Liabilities:
Total liabilities measured at fair value	14,509	15,605
Level 1
Assets:
Total assets measured at fair value	915,557	778,745
Liabilities:
Total liabilities measured at fair value	0	0
Level 2
Assets:
Total assets measured at fair value	255,550	201,636
Liabilities:
Total liabilities measured at fair value	14,509	15,605
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	894,548	765,699
Cash equivalents | Level 1
Assets:
Cash equivalents	891,788	757,725
Cash equivalents | Level 2
Assets:
Cash equivalents	2,760	7,974
Cash equivalents | Level 3
Assets:
Cash equivalents	0	0
Short-term investments
Assets:
Short-term investments	104,753	153,989
Short-term investments | Level 1
Assets:
Short-term investments	12,313	8,269
Short-term investments | Level 2
Assets:
Short-term investments	92,440	145,720
Short-term investments | Level 3
Assets:
Short-term investments	0	0
Prepaid expenses and other
Assets:
Other assets	1,119	251
Prepaid expenses and other | Level 1
Assets:
Other assets	0	0
Prepaid expenses and other | Level 2
Assets:
Other assets	1,119	251
Prepaid expenses and other | Level 3
Assets:
Other assets	0	0
Long-term investments
Assets:
Long-term investments	134,278	35,385
Long-term investments | Level 1
Assets:
Long-term investments	0	0
Long-term investments | Level 2
Assets:
Long-term investments	134,278	35,385
Long-term investments | Level 3
Assets:
Long-term investments	0	0
Other long-term assets
Assets:
Other assets	36,409	25,057
Other long-term assets | Level 1
Assets:
Other assets	11,456	12,751
Other long-term assets | Level 2
Assets:
Other assets	24,953	12,306
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	14,509	15,605
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	14,509	15,605
Accrued liabilities and other short-term obligations | Level 3
Liabilities:
Accrued liabilities and other short-term obligations	$ 0	$ 0

ACCOUNTS RECEIVABLE (Details)

ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands		12 Months Ended
	Mar. 07, 2022	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period		$ 10,958	$ 10,912	$ 10,598
Provision for doubtful accounts		5,718	4,199	2,346
Net Deductions		5,022	4,153	4,238
Balance at end of period		11,654	10,958	10,912
Interest and other income (loss)		88,026	47,050	30,837
Factoring Receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Gross amount of trade account receivable sold		60,300	11,800
Interest and other income (loss)		$ 3,100	$ 600
Russia
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision for doubtful accounts	$ 1,800
Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ 2,206
Unidentified Customer One | Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage		11%	13%
Unidentified Customer Two | Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage		10%	11%

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Inventories
Raw materials	$ 664,797	$ 664,916
Work-in-process	55,242	18,232
Finished goods	314,168	258,584
Deferred cost of goods sold	66,634	41,084
Gross inventories	1,100,841	982,816
Reserve for excess and obsolescence	(50,003)	(36,086)	$ (36,959)
Inventories, net	1,050,838	946,730
Reserve for excess and obsolete inventory [Roll Forward]
Valuation allowance, beginning balance	36,086	36,959	39,637
Provisions	29,464	16,184	17,850
Disposals	15,547	17,057	20,528
Valuation allowance, ending balance	$ 50,003	$ 36,086	$ 36,959

PREPAID EXPENSES AND OTHER (Det

PREPAID EXPENSES AND OTHER (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Capitalized Contract Cost [Line Items]
Prepaid VAT and other taxes	$ 96,724	$ 63,975
Prepaid expenses	58,954	55,440
Product demonstration equipment, net	40,682	35,929
Other non-trade receivables	33,408	24,026
Deferred deployment expense	1,170	877
Derivative assets	1,118	251
Prepaid expenses and other	405,694	370,053
Depreciation of product demonstration equipment	8,000	8,700	$ 9,800
Contract assets for unbilled accounts receivable, net
Capitalized Contract Cost [Line Items]
Contract assets	150,312	156,039
Capitalized contract acquisition costs
Capitalized Contract Cost [Line Items]
Contract assets	$ 23,326	$ 33,516

EQUIPMENT, BUILDING, FURNITUR_3

EQUIPMENT, BUILDING, FURNITURE AND FIXTURES (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Property, Plant and Equipment, Net [Abstract]
Equipment, building, furniture and fixtures, gross	$ 818,780	$ 768,822
Accumulated depreciation and amortization	(538,633)	(501,043)
Equipment, building, furniture and fixtures, net	280,147	267,779
Equipment, furniture and fixtures
Property, Plant and Equipment, Net [Abstract]
Equipment, building, furniture and fixtures, gross	676,485	619,160
Building subject to finance lease
Property, Plant and Equipment, Net [Abstract]
Equipment, building, furniture and fixtures, gross	67,904	69,247
Leasehold improvements
Property, Plant and Equipment, Net [Abstract]
Equipment, building, furniture and fixtures, gross	74,391	80,415
Equipment, Building, Furniture and Fixtures
Property, Plant and Equipment, Net [Abstract]
Depreciation of equipment, furniture and fixtures, and amortization of leasehold improvements	$ 84,600	$ 87,200	$ 86,500

INTANGIBLE ASSETS (Details)

INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Intangible Assets
Gross Intangible	$ 1,012,496	$ 826,904
Accumulated Amortization	(806,869)	(757,387)
Net Intangible	205,627	69,517
Amortization of intangible assets	49,616	44,281	$ 36,033
Expected future amortization of finite-lived intangible assets
Net Intangible	205,627	69,517
Developed technology
Intangible Assets
Gross Intangible	503,618	428,218
Accumulated Amortization	(414,941)	(386,300)
Net Intangible	88,677	41,918
Expected future amortization of finite-lived intangible assets
Net Intangible	88,677	41,918
In-process research and development
Intangible Assets
Gross Intangible	89,100	0
Accumulated Amortization	0	0
Net Intangible	89,100	0
Expected future amortization of finite-lived intangible assets
Net Intangible	89,100	0
Patents and licenses
Intangible Assets
Gross Intangible	8,795	8,415
Accumulated Amortization	(5,203)	(4,228)
Net Intangible	3,592	4,187
Expected future amortization of finite-lived intangible assets
Net Intangible	3,592	4,187
Customer relationships, covenants not to compete, outstanding purchase orders and contracts
Intangible Assets
Gross Intangible	410,983	390,271
Accumulated Amortization	(386,725)	(366,859)
Net Intangible	24,258	23,412
Expected future amortization of finite-lived intangible assets
Net Intangible	24,258	$ 23,412
Intangible Assets, Excluding In-Process Research And Development
Intangible Assets
Net Intangible	116,527
Expected future amortization of finite-lived intangible assets
2024	40,601
2025	34,582
2026	23,348
2027	15,843
2028	1,991
Thereafter	162
Net Intangible	$ 116,527

GOODWILL (Details)

GOODWILL (Details) $ in Thousands	12 Months Ended
	Oct. 28, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 328,322
Acquisitions	116,644
Translation	(201)
Goodwill, ending balance	444,765
Platform Software and Services
Goodwill [Roll Forward]
Goodwill, ending balance	156,191
Blue Planet Automation Software and Services
Goodwill [Roll Forward]
Goodwill, ending balance	89,049
Networking Platforms
Goodwill [Roll Forward]
Goodwill, ending balance	199,525
Operating Segments | Platform Software and Services
Goodwill [Roll Forward]
Goodwill, beginning balance	156,191
Acquisitions	0
Translation	0
Goodwill, ending balance	156,191
Operating Segments | Blue Planet Automation Software and Services
Goodwill [Roll Forward]
Goodwill, beginning balance	89,049
Acquisitions	0
Translation	0
Goodwill, ending balance	89,049
Operating Segments | Networking Platforms
Goodwill [Roll Forward]
Goodwill, beginning balance	83,082
Acquisitions	116,644
Translation	(201)
Goodwill, ending balance	$ 199,525

OTHER BALANCE SHEET DETAILS - O

OTHER BALANCE SHEET DETAILS - Other Long Term Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Other long-term assets
Maintenance spares inventory, net	$ 54,042	$ 44,815
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Total	Total
Interest rate swaps	$ 24,953	$ 12,306
Deferred compensation plan assets	11,456	12,751
Cloud computing arrangements	8,589	6,050
Capitalized contract acquisition costs	6,879	6,151
Deferred debt issuance costs, net	1,956	781
Restricted cash	168	26
Cost method equity investments	48	20,698
Other	8,362	10,039
Total	116,453	113,617
Amortization of cloud computing arrangements	2,600	2,800	$ 2,400
Revolving Credit Facility
Other long-term assets
Amortization of debt issuance costs included in interest expense	$ 400	$ 400	$ 400

OTHER BALANCE SHEET DETAILS - A

OTHER BALANCE SHEET DETAILS - Accrued Liabilities (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021	Oct. 31, 2020
Accrued liabilities
Compensation, payroll related tax and benefits	$ 159,530	$ 126,338
Warranty	57,089	45,503	$ 48,019	$ 49,868
Vacation	29,503	26,396
Income taxes payable	16,341	11,472
Foreign currency forward contracts	14,509	15,604
Interest payable	$ 4,514	$ 4,793
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total	Total
Finance lease liabilities	$ 3,953	$ 3,758
Other	145,980	126,918
Total	$ 431,419	$ 360,782

OTHER BALANCE SHEET DETAILS -_2

OTHER BALANCE SHEET DETAILS - Accrued Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning Balance	$ 45,503	$ 48,019	$ 49,868
Current Year Provisions	31,742	17,440	17,093
Settlements	(20,156)	(19,956)	(18,942)
Ending Balance	$ 57,089	$ 45,503	$ 48,019

OTHER BALANCE SHEET DETAILS - D

OTHER BALANCE SHEET DETAILS - Deferred Revenue (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Disaggregation of Revenue [Line Items]
Total	$ 228,460	$ 200,235
Less current portion	(154,419)	(137,899)
Long-term deferred revenue	74,041	62,336
Products
Disaggregation of Revenue [Line Items]
Total	28,353	19,814
Services
Disaggregation of Revenue [Line Items]
Total	$ 200,107	$ 180,421

OTHER BALANCE SHEET DETAILS -_3

OTHER BALANCE SHEET DETAILS - Other Long-Term Obligations (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Balance Sheet Related Disclosures [Abstract]
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other long-term obligations	Other long-term obligations
Finance lease liabilities	$ 48,192	$ 53,176
Income tax liability	98,259	72,644
Deferred compensation plan liability	11,444	12,535
Other	12,512	11,980
Other long-term obligations	$ 170,407	$ 150,335

DERIVATIVE INSTRUMENTS (Details

DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 28, 2023	Jan. 31, 2023	Oct. 29, 2022	Apr. 30, 2022	Oct. 31, 2018
Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract maturities	24 months
Foreign Currency Forward Contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 226.3		$ 108
Foreign Currency Forward Contracts | Not Designated as Hedging Instrument | Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract maturities	12 months
Foreign Currency Forward Contracts | Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 367.3		$ 272.2
Foreign Currency Forward Contracts | Cash Flow Hedging | Designated as Hedging Instrument | Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract maturities	24 months
Foreign Currency Forward Contracts | Net Investment Hedging | Designated as Hedging Instrument | INDIA
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 48
Foreign exchange contract maturities	24 months
Forward starting interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument | Term Loan 2025 | Secured Debt
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract		$ 350			$ 350
Fixed interest amount resulting from interest rate swap		2.883%			2.957%
Forward starting interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument | Term Loan 2025 | Secured Debt | SOFR
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 350
Forward starting interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument | 2030 Term Loan | Secured Debt
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 350
Fixed interest amount resulting from interest rate swap		3.47%
Forward starting interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument | 2030 New Term Loan | Secured Debt
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract		$ 350
Forward starting interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument | 2030 New Term Loan | Secured Debt | SOFR
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract				$ 350
Fixed interest amount resulting from interest rate swap				2.968%

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 2,712,861	$ 3,020,018	$ 2,509,597
Other comprehensive gain (loss) before reclassifications	8,417	(54,034)	36,601
Amounts reclassified from AOCI	461	6,950	(804)
Ending balance	2,848,361	2,712,861	3,020,018
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(46,645)	439	(35,358)
Ending balance	(37,767)	(46,645)	439
Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(2,965)	(164)	45
Other comprehensive gain (loss) before reclassifications	2,593	(2,801)	(209)
Amounts reclassified from AOCI	0	0	0
Ending balance	(372)	(2,965)	(164)
Unrealized Gain/Losses on Derivative Instruments | Foreign Currency Forward Contracts
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(10,197)	6,216	(219)
Other comprehensive gain (loss) before reclassifications	(8,455)	(16,299)	16,856
Amounts reclassified from AOCI	10,496	(114)	(10,421)
Ending balance	(8,156)	(10,197)	6,216
Unrealized Gain/Losses on Derivative Instruments | Interest Rate Swaps
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	9,397	(12,179)	(21,535)
Other comprehensive gain (loss) before reclassifications	19,600	14,512	(261)
Amounts reclassified from AOCI	(10,035)	7,064	9,617
Ending balance	18,962	9,397	(12,179)
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(42,880)	6,566	(13,649)
Other comprehensive gain (loss) before reclassifications	(5,321)	(49,446)	20,215
Amounts reclassified from AOCI	0	0	0
Ending balance	$ (48,201)	$ (42,880)	$ 6,566

LEASES - Narrative (Details)

LEASES - Narrative (Details) ft² in Millions, $ in Millions	12 Months Ended
	Oct. 28, 2023 USD ($) ft²
Leases [Abstract]
Area leased (in sq ft) | ft²	1.1
Remaining lease term (up to)	9 years
Extension term (up to)	10 years
Termination period (up to)	4 years
ROU assets that involve subleased or vacant space	$ 7.5
Finance lease buildings, net that involve subleased or vacant space	$ 6

LEASES - Leases Included in the

LEASES - Leases Included in the Balance Sheet (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Operating leases:
Operating ROU Assets	$ 35,140	$ 45,108
Operating lease liabilities	49,914	61,317
Finance leases:
Buildings, gross	$ 67,904	$ 69,247
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Equipment, building, furniture and fixtures, net	Equipment, building, furniture and fixtures, net
Less: accumulated depreciation	$ (30,079)	$ (26,266)
Buildings, net	37,825	42,981
Finance lease liabilities	52,145
Accrued liabilities and other short-term obligations
Finance leases:
Finance lease liabilities	52,145	56,934
Other long-term obligations
Finance leases:
Finance lease liabilities	$ 52,145	$ 56,934

LEASES - Lease Cost (Details)

LEASES - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Leases [Abstract]
Operating lease costs	$ 16,080	$ 17,966	$ 16,602
Finance lease cost:
Amortization of finance ROU asset	4,448	4,592	4,773
Interest on finance lease liabilities	4,069	4,601	4,882
Total finance lease cost	8,517	9,193	9,655
Non-capitalized lease cost	910	917	1,152
Variable lease cost	3,421	5,898	5,690
Net lease cost	28,928	33,974	33,099
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Amortization	$ 6,500	$ 12,800	$ 8,800

LEASES - Leases Maturity (Detai

LEASES - Leases Maturity (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Operating Leases
2024	$ 18,126
2025	13,568
2026	9,951
2027	5,563
2028	1,516
Thereafter	5,796
Total lease payments	54,520
Less: Imputed interest	(4,606)
Present value of lease liabilities	49,914	$ 61,317
Less: Current portion of present value of minimum lease payments	(16,655)	(18,925)
Long-term portion of present value of minimum lease payments	33,259	42,392
Finance Leases
2024	7,640
2025	7,793
2026	7,824
2027	8,095
2028	8,367
Thereafter	31,435
Total lease payments	71,154
Less: Imputed interest	(19,009)
Present value of lease liabilities	52,145
Less: Current portion of present value of minimum lease payments	(3,953)	(3,758)
Long-term portion of present value of minimum lease payments	48,192	$ 53,176
Total
2024	25,766
2025	21,361
2026	17,775
2027	13,658
2028	9,883
Thereafter	37,231
Total lease payments	125,674
Less: Imputed interest	(23,615)
Present value of lease liabilities	102,059
Less: Current portion of present value of minimum lease payments	20,608
Long-term portion of present value of minimum lease payments	$ 81,451

LEASES - Weighted Average Remai

LEASES - Weighted Average Remaining Lease Terms and Discount Rates (Details)	Oct. 28, 2023	Oct. 29, 2022
Weighted-average remaining lease term in years:
Operating leases	4 years 25 days	3 years 10 months 6 days
Finance leases	8 years 8 months 15 days	9 years 8 months 15 days
Weighted-average discount rates:
Operating leases	3.88%	2.97%
Finance leases	7.56%	7.56%

SHORT-TERM AND LONG-TERM DEBT -

SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Thousands			12 Months Ended
	Oct. 24, 2023	Jan. 19, 2023	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021	Jan. 18, 2022
Debt Instrument [Line Items]
Proceeds from issuance			$ 830	$ 0	$ 0
2030 Term Loan
Debt Instrument [Line Items]
Principal Balance		$ 1,250
Debt instrument, redemption price, percentage		0.25%
Aggregate principal amount		$ 500,000
Proceeds from issuance of debt		$ 492,500
2030 Term Loan | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
2030 Term Loan | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate		1%
2030 Term Loan | SOFR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		2.50%
2030 Term Loan | SOFR | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate		0%
2030 New Term Loan
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	0.25%
2030 New Term Loan | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1%
2030 New Term Loan | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	1%
2030 New Term Loan | SOFR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2%
2030 New Term Loan | SOFR | Minimum
Debt Instrument [Line Items]
Debt instrument, stated interest rate	0%
Secured Debt
Debt Instrument [Line Items]
Repayments of debt	$ 1,200,000
Secured Debt | 2025 Term Loan
Debt Instrument [Line Items]
Principal Balance				673,000
Repayments of debt	668,700
Deferred debt issuance costs	4,400
Amortization of debt issuance costs included in interest expense			600	600
Secured Debt | 2030 Term Loan
Debt Instrument [Line Items]
Original discount	2,200
Amortization of debt issuance costs included in interest expense			500
Secured Debt | 2030 New Term Loan
Debt Instrument [Line Items]
Principal Balance	1,200,000		1,170,000
Repayments of debt	497,500
Proceeds from issuance	800
Deferred debt issuance costs	6,000		5,507
Original discount	2,900		5,122
Amortization of debt issuance costs included in interest expense			100
Long-term debt, fair value			1,200,000
Secured Debt | 2030 New Term Loan | New Lenders
Debt Instrument [Line Items]
Deferred debt issuance costs	100
Secured Debt | 2030 New Term Loan | Maximum
Debt Instrument [Line Items]
Installment payment	11,700
Secured Debt | 2030 New Term Loan | Minimum
Debt Instrument [Line Items]
Installment payment	2,900
Secured Debt | 2030 Senior Notes 4.00% fixed-rate
Debt Instrument [Line Items]
Principal Balance			400,000
Deferred debt issuance costs			4,265
Long-term debt, fair value			330,500
Secured Debt | Credit Agreement
Debt Instrument [Line Items]
Debt instrument, accordion feature, increase limit	$ 640,000
Debt instrument, covenant, leverage ratio, maximum	3
Debt instrument, covenant, interest coverage ratio, minimum	2
Senior Notes | 2030 Term Loan
Debt Instrument [Line Items]
Debt instrument, stated interest rate		1%
Senior Notes | 2030 New Term Loan
Debt Instrument [Line Items]
Debt instrument, stated interest rate	1%
Debt instrument, unamortized discount (premium) and debt issuance costs, net			$ 5,500
Senior Notes | 2030 Senior Notes 4.00% fixed-rate
Debt Instrument [Line Items]
Debt instrument, stated interest rate			4%			4%
Debt instrument, unamortized discount (premium) and debt issuance costs, net			$ 4,300	5,000
Amortization of debt issuance costs included in interest expense			$ 700	$ 500
Aggregate principal amount						$ 400,000
Line of Credit | Credit Agreement
Debt Instrument [Line Items]
Debt instrument, covenant, interest coverage ratio, minimum	3
Line of Credit | The Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 300,000
Line of Credit | The Credit Facility | SOFR | Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, stated interest rate	0%
Line of Credit | The Credit Facility | SOFR | Maximum | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	2%
Line of Credit | The Credit Facility | SOFR | Minimum | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate	1.375%

SHORT-TERM AND LONG-TERM DEBT_2

SHORT-TERM AND LONG-TERM DEBT - Net Carrying Values of Term Loans (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 24, 2023	Oct. 29, 2022	Jan. 18, 2022
Secured Debt | 2030 New Term Loan
Debt Instrument [Line Items]
Principal Balance	$ 1,170,000	$ 1,200,000
Unamortized Discount	(5,122)	(2,900)
Deferred Debt Issuance Costs	(5,507)	$ (6,000)
Net Carrying Value	1,159,371
Secured Debt | 2030 Senior Notes 4.00% fixed-rate
Debt Instrument [Line Items]
Principal Balance	400,000
Deferred Debt Issuance Costs	(4,265)
Net Carrying Value	$ 395,735		$ 395,045
Senior Notes | 2030 New Term Loan
Debt Instrument [Line Items]
Debt instrument, stated interest rate		1%
Senior Notes | 2030 Senior Notes 4.00% fixed-rate
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4%			4%

REVOLVING CREDIT FACILITY (Deta

REVOLVING CREDIT FACILITY (Details)	Oct. 24, 2023 USD ($)	Oct. 28, 2023 USD ($)	Oct. 23, 2023	Feb. 10, 2023 USD ($)
Letter of Credit
Line of Credit Facility [Line Items]
Letters of credit collateralized by the credit facility		$ 72,500,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Current borrowing capacity				$ 300,000,000
Line of credit outstanding		$ 0
Line of Credit | Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument, covenant, interest coverage ratio, minimum	3
Line of Credit | Credit Agreement | Debt Covenant Period Two
Line of Credit Facility [Line Items]
Debt instrument, covenant, leverage ratio, maximum			3.50
Line of Credit | Credit Agreement | Debt Covenant Period Three
Line of Credit Facility [Line Items]
Debt instrument, covenant, leverage ratio, maximum	4
Line of Credit | Revolving Credit Facility | The Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 300,000,000
Line of credit facility, accordion feature, increase limit	450,000,000
Letters of credit collateralized by the credit facility	$ 65,100,000
Line of Credit | Revolving Credit Facility | The Credit Facility | Debt Covenant Period One
Line of Credit Facility [Line Items]
Debt instrument, covenant, leverage ratio, maximum	5
Line of Credit | Revolving Credit Facility | The Credit Facility | Minimum
Line of Credit Facility [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.225%
Line of Credit | Revolving Credit Facility | The Credit Facility | Maximum
Line of Credit Facility [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.30%
Line of Credit | Revolving Credit Facility | The Credit Facility | SOFR
Line of Credit Facility [Line Items]
Debt instrument, stated interest rate	0%
Line of Credit | Revolving Credit Facility | The Credit Facility | SOFR | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.375%
Line of Credit | Revolving Credit Facility | The Credit Facility | SOFR | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate, credit spread adjustment	0.10%
Basis spread on variable rate	2%
Line of Credit | Revolving Credit Facility | The Credit Facility | Base Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.375%
Line of Credit | Revolving Credit Facility | The Credit Facility | Base Rate | Maximum
Line of Credit Facility [Line Items]
Debt instrument, stated interest rate	1%
Basis spread on variable rate	1%
Line of Credit | Letter of Credit | The Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 200,000,000
Line of Credit | Swingline Loan | The Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 50,000,000

EARNINGS PER SHARE CALCULATIO_2

EARNINGS PER SHARE CALCULATION - Earnings Per Share Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 254,827	$ 152,902	$ 500,196
Basic weighted average shares outstanding (in shares)	148,971	151,208	155,279
Effect of dilutive potential common shares (in shares)	409	985	1,464
Diluted weighted average shares outstanding (in shares)	149,380	152,193	156,743
Basic EPS (in dollars per share)	$ 1.71	$ 1.01	$ 3.22
Diluted EPS (in dollars per share)	$ 1.71	$ 1	$ 3.19
Antidilutive employee share-based awards, excluded (in shares)	2,675	1,370	110

STOCKHOLDERS_ EQUITY (Details)

STOCKHOLDERS’ EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	2 Months Ended	12 Months Ended			36 Months Ended
	Feb. 11, 2022	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021	Dec. 08, 2021	Dec. 13, 2021	Dec. 09, 2021	Dec. 13, 2018
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock under the stock repurchase program (in shares)		14.1
Stock repurchases		$ 750,000
Repurchase of common stock under the stock repurchase program (in dollars per share)		$ 53.17
Authorized funds under stock repurchase program		$ 250,000
Shares repurchased for tax withholdings on vesting of restricted stock units		38,506	$ 48,454	$ 44,071
Net exercise tax		$ 1,500
Stock Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program authorized amount							$ 1,000,000	$ 500,000
Repurchase of common stock under the stock repurchase program (in shares)		5.7	4.8	1.7	7.4
Stock repurchases		$ 250,000	$ 250,000	$ 92,100	$ 316,700
Repurchase of common stock under the stock repurchase program (in dollars per share)		$ 44.08	$ 51.53	$ 54.27	$ 42.75
Accelerated Share Repurchase Agreement
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program authorized amount						$ 250,000
Repurchase of common stock under the stock repurchase program (in shares)	3.6
Repurchase of common stock under the stock repurchase program (in dollars per share)	$ 69.78

INCOME TAXES - Provision (Benef

INCOME TAXES - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Current:
Federal	$ 36,537	$ 27,479	$ 72,603
State	18,860	10,289	21,400
Foreign	28,281	19,337	25,021
Total current	83,678	57,105	119,024
Deferred:
Federal	(8,010)	(30,032)	(21,942)
State	(17,354)	520	(11,546)
Foreign	10,512	2,010	(122,981)
Total deferred	(14,852)	(27,502)	(156,469)
Provision (benefit) for income taxes	$ 68,826	$ 29,603	$ (37,445)

INCOME TAXES - Income Before Pr

INCOME TAXES - Income Before Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Income (loss) before provision (benefit) for income taxes:
United States	$ 93,682	$ 28,784	$ 298,514
Foreign	229,971	153,721	164,237
Income before income taxes	$ 323,653	$ 182,505	$ 462,751

INCOME TAXES - Effective Income

INCOME TAXES - Effective Income Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Oct. 28, 2023	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Income tax rate reconciliation:
Provision at statutory rate		21%	21%	21%
Intercompany IP Restructuring Transaction		0%	0%	(25.85%)
State taxes		1.65%	2.31%	3.73%
Withholding and other foreign taxes		(0.09%)	(1.37%)	2.76%
Foreign earnings and profits repatriated	$ 381
Research and development credit		(16.78%)	(23.66%)	(7.99%)
Non-deductible compensation		5.29%	5.26%	1.68%
Foreign derived intangible income		0%	0%	(1.82%)
US Taxation on foreign activity		5.08%	1.73%	0%
Foreign Nontaxable interest		(1.06%)	(1.90%)	0%
Taxation on foreign inflation		1.34%	1.41%	0.16%
Rate change		(3.71%)	1.27%	(4.33%)
Valuation allowance		9.44%	8.35%	1.77%
Loss on equity transactions		(1.72%)	0%	0%
Uncertain tax positions		1.72%	1.62%	0.63%
Other		(0.89%)	0.20%	0.17%
Effective income tax rate		21.27%	16.22%	(8.09%)

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 28, 2023	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021	Oct. 31, 2020
Income Tax Disclosure [Abstract]
Intra-entity transfer of non-US intellectual property rights, income tax benefit		$ 119,300
Unrecognized tax benefits, interest and penalties accrued	$ 7,900	7,900	$ 5,200
Interest and penalties expense (benefit)		2,700	1,700	$ 100
Undistributed earnings of foreign subsidiaries retained	222,000
Provision of foreign income tax earnings	2,500
Foreign earnings and profits repatriated	381,000
Cumulative amount of temporary differences for unremitted foreign earnings for which a deferred tax liability has not been recognized	30,000	30,000
Valuation allowance	$ 189,870	$ 189,870	$ 162,076	$ 159,634	$ 151,427

INCOME TAXES - Components of De

INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021	Oct. 31, 2020
Deferred tax assets:
Reserves and accrued liabilities	$ 82,160	$ 76,839
Depreciation and amortization	712,098	690,636
NOL and credit carry forward	197,984	154,707
Other	6,934	63,902
Gross deferred tax assets	999,176	986,084
Valuation allowance	(189,870)	(162,076)	$ (159,634)	$ (151,427)
Deferred tax asset, net of valuation allowance	$ 809,306	$ 824,008

INCOME TAXES - Reconciliation o

INCOME TAXES - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest and penalties
Unrecognized tax benefits, beginning balance	$ 80,514	$ 77,091	$ 95,748
Decrease related to positions taken in prior period			(22,854)
Increase related to positions taken in prior period	9,940	4,732
Reductions related to settlements with taxing authorities	(625)	(3,229)	(654)
Increase related to positions taken in current period	4,960	2,959	5,510
Reductions related to expiration of statute of limitations	(869)	(1,039)	(659)
Unrecognized tax benefits, ending balance	$ 93,920	$ 80,514	$ 77,091

INCOME TAXES - Valuation Allowa

INCOME TAXES - Valuation Allowance of Gross Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Valuation allowance against gross deferred tax assets:
Valuation allowance, beginning balance	$ 162,076	$ 159,634	$ 151,427
Additions	28,746	15,245	17,897
Deductions	952	12,803	9,690
Valuation allowance, ending balance	$ 189,870	$ 162,076	$ 159,634

SHARE-BASED COMPENSATION EXPE_3

SHARE-BASED COMPENSATION EXPENSE - Narrative (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 28, 2023 USD ($) period $ / shares shares	Oct. 29, 2022 USD ($) $ / shares shares	Oct. 30, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted during the period (in shares)	0	0	0
Unrecognized share-based compensation | $	$ 201
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of service-based awards	4 years
Intrinsic value of option exercised | $	$ 0.3	$ 1.6	$ 0.5
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period	10 years
Age reached	60 years
Retirement notice period	12 months
Awards outstanding (in shares)	4,922,000	4,103,000
Total fair value of restricted stock units vested and converted into common stock | $	$ 98.2	$ 119	$ 110
Weighted average fair value of each restricted stock unit granted (in dollars per share) | $ / shares	$ 50.48	$ 67.03	$ 48.70
Nonvested award compensation cost not yet recognized, period for recognition	1 year 4 months 20 days
Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of service-based awards	3 years
Restricted Stock Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of service-based awards	4 years
Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	300,000	300,000
2017 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum expiration period of incentive awards	10 years
Number of shares authorized (in shares)	21,100,000
Remaining authorized shares available for issuance (in shares)	5,600,000
2017 Omnibus Incentive Plan | Employee Stock Options and Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum expiration period of incentive awards	10 years
Minimum exercise price, percentage of fair market value on grant date	100%
2017 Omnibus Incentive Plan | Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of service-based awards	1 year
Employee Stock Purchase Plan | Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining authorized shares available for issuance (in shares)	11,300,000
Offer period for ESPP	12 months
Number of purchase periods in offer period | period	2
Purchase period	6 months
ESPP discount percentage purchase date	85%
Shares issued under ESPP (in shares)	800,000	700,000	700,000

SHARE-BASED COMPENSATION EXPE_4

SHARE-BASED COMPENSATION EXPENSE - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Shares Underlying Options Outstanding
Beginning Balance (in shares)	32,000
Granted (in shares)	0	0	0
Exercised (in shares)	(22,000)
Canceled (in shares)	(3,000)
Ending Balance (in shares)	7,000	32,000
Weighted Average Exercise Price
Beginning Balance (in dollars per share)	$ 30.98
Granted (in dollars per share)	0
Exercised (in dollars per share)	33.98
Canceled (in dollars per share)	45.32
Ending Balance (in dollars per share)	$ 16.94	$ 30.98

SHARE-BASED COMPENSATION EXPE_5

SHARE-BASED COMPENSATION EXPENSE - Stock Options Outstanding (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022
Summarizes information with respect to stock options outstanding
Weighted average exercise price, (in dollars per share)	$ 16.94	$ 30.98
Range of Exercise Price Range One
Summarizes information with respect to stock options outstanding
Range of exercise price, lower (in dollars per share)	14.38
Range of exercise price, upper (in dollars per share)	$ 18.22
Number of underlying shares (in shares)	7
Weighted average remaining contractual life (in years)	4 months 9 days
Weighted average exercise price, (in dollars per share)	$ 16.94
Aggregate intrinsic value	$ 178

SHARE-BASED COMPENSATION EXPE_6

SHARE-BASED COMPENSATION EXPENSE - Assumptions for Awards Granted (Details) - Performance Based Awards	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility of Ciena common stock, which is a weighted average of implied volatility and historical volatility	40.37%	38.27%	41%
Historical volatility of Ciena common stock	43.11%	42.17%	42.80%
Historical volatility of S&P Networking Index	30.93%	27.22%	27.30%
Correlation coefficient	0.7781	0.7049	0.6800
Expected life in years	2 years 10 months 20 days	2 years 10 months 20 days	2 years 10 months 13 days
Risk-free interest rate	3.95%	0.94%	0.17%
Expected dividend yield	0%	0%	0%

SHARE-BASED COMPENSATION EXPE_7

SHARE-BASED COMPENSATION EXPENSE - Restricted Stock Units (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022
Summary of Restricted Stock Unit Activity
Restricted shares outstanding, Beginning balance (in shares)	4,103
Restricted stock units outstanding, granted (in shares)	3,301
Restricted stock units outstanding, vested (in shares)	(2,067)
Restricted stock units outstanding, canceled or forfeited (in shares)	(415)
Restricted shares outstanding, Ending balance (in shares)	4,922
Weighted average grant date fair value per share (in dollars per share)	$ 53.42	$ 55.16
Aggregate fair value	$ 201,916	$ 197,960

SHARE-BASED COMPENSATION EXPE_8

SHARE-BASED COMPENSATION EXPENSE - Components of Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Share-based compensation expense
Share-based compensation expense capitalized in inventory, net	$ 413	$ 137	$ (72)
Total share-based compensation	130,455	105,131	84,336
Share-based compensation expense included in cost of goods sold
Share-based compensation expense
Share-based compensation expense included in operating expense	14,988	11,400	8,589
Products
Share-based compensation expense
Share-based compensation expense included in operating expense	4,518	3,867	3,408
Services
Share-based compensation expense
Share-based compensation expense included in operating expense	10,470	7,533	5,181
Share-based compensation expense included in operating expense
Share-based compensation expense
Share-based compensation expense included in operating expense	115,054	93,594	75,819
Research and development
Share-based compensation expense
Share-based compensation expense included in operating expense	42,331	31,879	21,863
Sales and marketing
Share-based compensation expense
Share-based compensation expense included in operating expense	35,136	31,280	25,152
General and administrative
Share-based compensation expense
Share-based compensation expense included in operating expense	$ 37,587	$ 30,435	$ 28,804

SEGMENT AND ENTITY WIDE DISCL_3

SEGMENT AND ENTITY WIDE DISCLOSURES - Narrative (Details) $ in Thousands	12 Months Ended
	Oct. 28, 2023 USD ($) segment	Oct. 29, 2022 USD ($)
Segment Reporting [Abstract]
Equipment, building, furniture and fixtures, net	$ 280,147	$ 267,779
Operating right-of-use assets	$ 35,140	$ 45,108
Number of operating segments | segment	4

SEGMENT AND ENTITY WIDE DISCL_4

SEGMENT AND ENTITY WIDE DISCLOSURES - Other Intangibles Assets, Goodwill and Maintenance Spares (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Segment Reporting Information [Line Items]
Other intangible assets, net	$ 205,627	$ 69,517
Goodwill	444,765	328,322
Maintenance spares, net	54,042	$ 44,815
Networking Platforms
Segment Reporting Information [Line Items]
Other intangible assets, net	188,383
Goodwill	199,525
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	17,244
Goodwill	89,049
Maintenance spares, net	0
Global Services
Segment Reporting Information [Line Items]
Other intangible assets, net	0
Goodwill	0
Maintenance spares, net	$ 54,042

SEGMENT AND ENTITY WIDE DISCL_5

SEGMENT AND ENTITY WIDE DISCLOSURES - Segment Profit (Loss) and Reconciliation to Consolidated Net Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 30, 2021
Less: non-performance operating expenses
Selling and marketing	$ 490,804	$ 466,565	$ 452,214
General and administrative	215,284	179,382	181,874
Significant asset impairments and restructuring costs	23,834	33,824	29,565
Amortization of intangible assets	37,351	32,511	23,732
Acquisition and integration costs	3,474	598	2,572
Add: other non-performance financial items
Interest and other income (loss), net	62,008	6,747	(1,768)
Interest expense	(88,026)	(47,050)	(30,837)
Loss on extinguishment and modification of debt	(7,874)	0	0
Less: Provision (benefit) for income taxes	68,826	29,603	(37,445)
Net income	254,827	152,902	500,196
Operating Segments
Add: other non-performance financial items
Net income	1,128,292	935,688	1,185,313
Operating Segments | Networking Platforms
Add: other non-performance financial items
Net income	778,641	572,305	850,901
Operating Segments | Platform Software and Services
Add: other non-performance financial items
Net income	186,945	175,108	136,602
Operating Segments | Blue Planet Automation Software and Services
Add: other non-performance financial items
Net income	(33,669)	(22,388)	(711)
Operating Segments | Global Services
Add: other non-performance financial items
Net income	$ 196,375	$ 210,663	$ 198,521

SEGMENT AND ENTITY WIDE DISCL_6

SEGMENT AND ENTITY WIDE DISCLOSURES - Entity Wide Reporting (Details) - USD ($) $ in Thousands	Oct. 28, 2023	Oct. 29, 2022
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	$ 315,287	$ 312,887
Canada
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	229,707	226,451
United States
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	46,933	47,515
Other International
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	$ 38,647	$ 38,921

OTHER EMPLOYEE BENEFIT PLANS (D

OTHER EMPLOYEE BENEFIT PLANS (Details)	12 Months Ended
	Oct. 28, 2023 CAD ($)	Oct. 28, 2023 USD ($)	Oct. 29, 2022 CAD ($)	Oct. 29, 2022 USD ($)	Oct. 30, 2021 CAD ($)	Oct. 30, 2021 USD ($)
Defined Contribution Pension Plan Canada
Defined Contribution Plan Disclosure [Line Items]
Maximum total employee and employer contribution percentage	18%	18%
Maximum total employee and employer contribution amount	$ 31,560	$ 25,748
Required employer contribution percent	1%	1%
Employer matching percentage for eligible employee contribution	50%	50%
Percentage of employee contribution with employer matching contribution	6%	6%
Employer matching contributions	$ 10,600,000	$ 7,600,000	$ 10,100,000	$ 7,300,000	$ 8,300,000	$ 6,000,000
Defined Contribution Profit Sharing Plan
Defined Contribution Plan Disclosure [Line Items]
Employer matching percentage for eligible employee contribution	50%	50%
Percentage of employee contribution with employer matching contribution	8%	8%
Employer matching contributions		$ 10,400,000		$ 9,200,000		$ 8,400,000
Maximum employee contribution percentage of pre-tax compensation	60%	60%
Employer discretionary contribution amount		$ 0

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) $ in Billions	Oct. 28, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Outstanding purchase order commitment	$ 1.7

Uncategorized Items - cien-2023

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]