Ciena (CIEN) 10-K 17 Dec 21 2021 FY Annual report Financial data

Cover

Cover - USD ($) $ in Billions	12 Months Ended
	Oct. 30, 2021	Dec. 10, 2021	Apr. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Oct. 30, 2021
Current Fiscal Year End Date	--10-30
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
Entity Shell Company	false
Entity Public Float			$ 7.8
Entity Common Stock, Shares Outstanding		154,882,650
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 2022 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	2021
Document Fiscal Period Focus	FY
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020
Current assets:
Cash and cash equivalents	$ 1,422,546	$ 1,088,624
Short-term investments	181,483	150,667
Accounts receivable, net	884,958	719,405
Inventories, net	374,265	344,379
Prepaid expenses and other	325,654	308,084
Total current assets	3,188,906	2,611,159
Long-term investments	70,038	82,226
Equipment, building, furniture and fixtures, net	284,968	272,377
Operating right-of-use assets	44,285	57,026
Goodwill	311,645	310,847
Other intangible assets, net	65,314	96,647
Deferred tax asset, net	800,180	647,805
Other long-term assets	99,891	102,830
Total assets	4,865,227	4,180,917
Current liabilities:
Accounts payable	356,176	291,904
Accrued liabilities and other short-term obligations	409,285	334,132
Deferred revenue	118,007	108,700
Operating lease liabilities	18,632	19,035
Current portion of long-term debt	6,930	6,930
Total current liabilities	909,030	760,701
Long-term deferred revenue	57,457	49,663
Other long-term obligations	166,803	123,185
Long-term operating lease liabilities	41,564	61,415
Long-term debt, net	670,355	676,356
Total liabilities	1,845,209	1,671,320
Commitments and contingencies
Stockholders’ equity:
Preferred stock — par value $0.01; 20,000,000 shares authorized; zero shares issued and outstanding	0	0
Common stock — par value $0.01; 290,000,000 shares authorized; 154,858,981 and 154,563,005 shares issued and outstanding	1,549	1,546
Additional paid-in capital	6,803,162	6,826,531
Accumulated other comprehensive income (loss)	439	(35,358)
Accumulated deficit	(3,785,132)	(4,283,122)
Total stockholders’ equity	3,020,018	2,509,597
Total liabilities and stockholders’ equity	$ 4,865,227	$ 4,180,917

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Oct. 30, 2021	Oct. 31, 2020
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)	154,858,981	154,563,005
Common stock, shares outstanding (in shares)	154,858,981	154,563,005

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Revenue:
Total revenue	$ 3,620,684	$ 3,532,157	$ 3,572,131
Cost of goods sold:
Total cost of goods sold	1,898,705	1,879,266	2,030,065
Gross profit	1,721,979	1,652,891	1,542,066
Operating expenses:
Research and development	536,666	529,888	548,139
Selling and marketing	452,214	416,425	423,046
General and administrative	181,874	169,548	174,399
Significant asset impairments and restructuring costs	29,565	22,652	24,538
Amortization of intangible assets	23,732	23,383	21,808
Acquisition and integration costs	2,572	4,031	3,370
Total operating expenses	1,226,623	1,165,927	1,195,300
Income from operations	495,356	486,964	346,766
Interest and other income (loss), net	(1,768)	964	3,876
Interest expense	(30,837)	(31,321)	(37,452)
Loss on extinguishment and modification of debt	0	(646)	0
Income before income taxes	462,751	455,961	313,190
Provision (benefit) for income taxes	(37,445)	94,670	59,756
Net income	$ 500,196	$ 361,291	$ 253,434
Basic net income per common share (in dollars per share)	$ 3.22	$ 2.34	$ 1.63
Diluted net income per potential common share (in dollars per share)	$ 3.19	$ 2.32	$ 1.61
Weighted average basic common shares outstanding (in shares)	155,279	154,287	155,720
Weighted average diluted potential common shares outstanding (in shares)	156,743	155,955	157,612
Products
Revenue:
Total revenue	$ 2,932,602	$ 2,914,790	$ 2,983,815
Cost of goods sold:
Total cost of goods sold	1,545,269	1,573,791	1,716,358
Services
Revenue:
Total revenue	688,082	617,367	588,316
Cost of goods sold:
Total cost of goods sold	$ 353,436	$ 305,475	$ 313,707

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Net income	$ 500,196	$ 361,291	$ 253,434
Other Comprehensive Income (Loss)
Change in unrealized gain (loss) on available-for-sale securities, net of tax	(209)	(107)	577
Change in accumulated translation adjustments	20,215	(4,174)	(763)
Other comprehensive income gain (loss)	35,797	(13,274)	(16,304)
Total comprehensive income	535,993	348,017	237,130
Change in unrealized gain (loss) on foreign currency forward contracts, net of tax
Other Comprehensive Income (Loss)
Change in unrealized gain (loss) on derivatives	6,435	(1,144)	3,985
Change in unrealized gain (loss) on forward starting interest rate swaps, net of tax
Other Comprehensive Income (Loss)
Change in unrealized gain (loss) on derivatives	$ 9,356	$ (7,849)	$ (20,103)

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Effect of adoption of new accounting standard	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Accumulated DeficitEffect of adoption of new accounting standard
Beginning balance (in shares) at Nov. 03, 2018			154,318,531
Beginning balance at Nov. 03, 2018	$ 1,929,334	$ 49,805	$ 1,543	$ 6,881,223	$ (5,780)	$ (4,947,652)	$ 49,805
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	253,434					253,434
Other comprehensive income (loss)	(16,304)				(16,304)
Repurchases of common stock - repurchase program (in shares)			(3,838,466)
Repurchases of common stock - repurchase program	(150,076)		$ (38)	(150,038)
Issuance of shares from employee equity plans (in shares)			3,112,916
Issuance of shares from employee equity plans	22,947		$ 31	22,916
Share-based compensation expense	59,736			59,736
Settlement of debt conversion liability (in shares)			1,585,140
Settlement of debt conversion liability	52,944		$ 16	52,928
Shares repurchased for tax withholdings on vesting of stock units awards (in shares)			(774,271)
Shares repurchased for tax withholdings on vesting of stock unit awards	(29,059)		$ (8)	(29,051)
Ending balance (in shares) at Nov. 02, 2019			154,403,850
Ending balance at Nov. 02, 2019	$ 2,172,761		$ 1,544	6,837,714	(22,084)	(4,644,413)
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 361,291					361,291
Other comprehensive income (loss)	(13,274)				(13,274)
Repurchases of common stock - repurchase program (in shares)			(1,872,446)
Repurchases of common stock - repurchase program	(74,535)		$ (19)	(74,516)
Issuance of shares from employee equity plans (in shares)			2,787,011
Issuance of shares from employee equity plans	28,068		$ 29	28,039
Share-based compensation expense	67,758			67,758
Shares repurchased for tax withholdings on vesting of stock units awards (in shares)			(755,410)
Shares repurchased for tax withholdings on vesting of stock unit awards	$ (32,472)		$ (8)	(32,464)
Ending balance (in shares) at Oct. 31, 2020	154,563,005		154,563,005
Ending 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 (in shares)			(1,696,949)
Repurchases of common stock - repurchase program	(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		154,858,981
Ending balance at Oct. 30, 2021	$ 3,020,018		$ 1,549	$ 6,803,162	$ 439	$ (3,785,132)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Cash flows provided by operating activities:
Net income	$ 500,196	$ 361,291	$ 253,434
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of equipment, building, furniture and fixtures, and amortization of leasehold improvements	96,233	93,908	87,576
Share-based compensation costs	84,336	67,758	59,736
Amortization of intangible assets	36,033	38,619	35,136
Deferred taxes	(156,469)	64,339	19,865
Provision for inventory excess and obsolescence	17,850	24,701	28,085
Provision for warranty	17,093	22,417	23,105
Other	14,525	20,483	5,830
Changes in assets and liabilities:
Accounts receivable	(174,377)	(17,299)	65,712
Inventories	(47,567)	(25,044)	(112,941)
Prepaid expenses and other	(19,691)	(38,998)	(96,618)
Operating right-of-use assets	16,632	16,787	0
Accounts payable, accruals and other obligations	162,134	(117,931)	27,740
Deferred revenue	16,822	2,519	16,480
Short and long-term operating lease liabilities	(22,104)	(19,896)	0
Net cash provided by operating activities	541,646	493,654	413,140
Cash flows provided by (used in) investing activities:
Payments for equipment, furniture, fixtures and intellectual property	(79,550)	(82,667)	(62,579)
Purchase of available for sale securities	(172,778)	(223,196)	(158,074)
Proceeds from maturities of available for sale securities	152,253	110,390	248,748
Proceeds from sale of equity investment	4,678	0	0
Purchase of equity investment	0	0	(2,667)
Settlement of foreign currency forward contracts, net	4,680	3,531	(1,351)
Acquisition of businesses, net of cash acquired	0	(28,300)	0
Net cash provided by (used in) investing activities	(90,717)	(220,242)	24,077
Cash flows used in financing activities:
Payment of long-term debt	(6,929)	(5,198)	(7,000)
Payment for debt conversion liability	0	0	(111,268)
Payment of debt issuance costs	0	(382)	(1,191)
Payment of finance lease obligations	(3,004)	(2,703)	(3,319)
Shares repurchased for tax withholdings on vesting of stock unit awards	(44,071)	(32,472)	(29,059)
Repurchases of common stock - repurchase program	(91,288)	(74,535)	(150,076)
Proceeds from issuance of common stock	28,457	28,068	22,947
Net cash used in financing activities	(116,835)	(87,222)	(278,966)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(198)	(1,643)	476
Net increase in cash, cash equivalents and restricted cash	333,896	184,547	158,727
Cash, cash equivalents and restricted cash at beginning of fiscal year	1,088,708	904,161	745,434
Cash, cash equivalents and restricted cash at end of fiscal year	1,422,604	1,088,708	904,161
Supplemental disclosure of cash flow information
Cash paid during the fiscal year for interest	29,864	32,837	39,579
Cash paid during the fiscal year for income taxes, net	73,127	53,076	33,570
Operating lease payments	24,058	22,089	0
Non-cash investing and financing activities
Purchase of equipment in accounts payable	10,138	7,854	16,549
Repurchase of common stock in accrued liabilities from repurchase program	800	0	0
Conversion of debt conversion liability into 1,585,140 shares of common stock	0	0	52,944
Operating lease right-of-use assets subject to lease liability	4,356	24,160	0
Unrealized gain on equity investment	$ 0	$ 2,681	$ 0

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)	12 Months Ended
	Oct. 30, 2021shares
Statement of Cash Flows [Abstract]
Debt conversion, shares issued (in shares)	1,585,140

CIENA CORPORATION AND SIGNIFICA

CIENA CORPORATION AND SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES	12 Months Ended
	Oct. 30, 2021
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 networking systems, services and software 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 enable the transport, routing, switching, aggregation, service delivery and management of video, data and voice traffic on communications networks. Ciena’s solutions are used by communications service providers, cable and multiservice operators, Web-scale providers, submarine network operators, governments, enterprises, research and education institutions and emerging network operators. Ciena’s portfolio is designed to enable what Ciena refers to as the Adaptive Network TM , Ciena’s vision for a network end state that emphasizes a programmable and scalable network infrastructure, software control and automation capabilities, network analytics and intelligence, and related advanced services. By transforming network infrastructures into a dynamic, programmable environment driven by automation and analytics, network operators can realize greater business agility, dynamically adapt 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 operation and maximize the return on their network infrastructure investment. Ciena’s solutions include Networking Platforms, including Ciena’s Converged Packet Optical and Routing and Switching portfolios, 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 Converged Packet Optical portfolio includes products that support the connection of content to content, including in long haul and regional, submarine and data center interconnect networks, and users to content, including in 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, edge, access and aggregation networks, connecting users to content in applications that include 5G and Internet of Things (“IoT”), mobile backhaul, optical access, virtualization and enterprise services. To complement Networking Platforms, Ciena offers Platform Software, which includes a wide array of software solutions that deliver operations, administration, maintenance, and provisioning (“OAM&P”) functionality, as well as domain control, orchestration, operational support systems (“OSS”) and service assurance to achieve closed loop automation across multi-vendor and multi-domain network environments. Through Ciena’s Blue Planet® Software suite, Ciena enables customers to accelerate the digital transformation of their networks through service lifecycle automation. In addition to Ciena’s 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, 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 30, 2021, October 31, 2020 and November 2, 2019 for the periods reported). Fiscal 2021, fiscal 2020 and fiscal 2019 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 income (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 30, 2021, the combined carrying value of these investments was $8.6 million. 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. Ciena tests goodwill impairment 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 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 over useful lives of two 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 right-of-use assets (“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. Maintenance Spares Maintenance spares are recorded at cost. Spares usage cost is expensed 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 Web-scale 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 ASC 340-40, Other Assets and Deferred Costs; Contracts with Customers , and the interpretations of the Financial Accounting Standards Board (“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 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. 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 and 27 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 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 Statement 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 shareholder 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 shareholder 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 shareholder 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 share 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 share 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 2012 through 2020, in Canada for 2013 through 2015, and in the United Kingdom for 2016 through 2019. 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 (2018), United Kingdom (2016), Canada (2013), and India (2012). 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 has not provided for U.S. deferred income taxes on the cumulative unremitted earnings of its non-U.S. affiliates, as it plans to indefinitely reinvest these foreign earnings outside the U.S. As of October 30, 2021, the cumulative amount of such temporary differences for which a deferred tax liability has not been recognized totaled approximately $475.0 million. If these earnings were distributed to the U.S. in the form of dividends, or otherwise, or if the shares of the relevant foreign subsidiaries were sold or otherwise transferred, Ciena would be subject to additional U.S. income taxes (subject to an adjustment for foreign tax credits) and foreign withholding taxes. Ciena would also be subject to additional foreign withholding taxes of approximately $32.0 million. Additionally, there are no other significant temporary differences for which a deferred tax liability has not been recognized. 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 in fiscal 2019, fiscal 2020 and fiscal 2021, 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 a

REVENUE

REVENUE	12 Months Ended
	Oct. 30, 2021
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE Disaggregation of Revenue Ciena’s disaggregated revenue represents similar groups that depict the nature, amount, and timing of revenue and cash flows for Ciena’s various offerings. The sales cycle, contractual obligations, customer requirements, and go-to-market strategies may differ for each of its product categories, resulting in different economic risk profiles for each category. Effective as of the beginning of fiscal 2021, Ciena renamed its “Packet Networking” product line to “Routing and Switching.” This change, affecting only the presentation of such information, was made on a prospective basis and does not impact comparability of previous financial results. References to prior reported “Packet Networking” product line have been changed herein to “Routing and Switching.” The tables below set forth Ciena’s disaggregated revenue for the respective period (in thousands): Year Ended October 30, 2021 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 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 Year Ended October 31, 2020 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 2,547,647 $ — $ — $ — $ 2,547,647 Routing and Switching 267,416 — — — 267,416 Platform Software and Services — 197,809 — — 197,809 Blue Planet Automation Software and Services — — 62,632 — 62,632 Maintenance Support and Training — — — 269,354 269,354 Installation and Deployment — — — 152,003 152,003 Consulting and Network Design — — — 35,296 35,296 Total revenue by product line $ 2,815,063 $ 197,809 $ 62,632 $ 456,653 $ 3,532,157 Timing of revenue recognition: Products and services at a point in time $ 2,815,063 $ 69,099 $ 19,583 $ 14,363 $ 2,918,108 Products and services transferred over time — 128,710 43,049 442,290 614,049 Total revenue by timing of revenue recognition $ 2,815,063 $ 197,809 $ 62,632 $ 456,653 $ 3,532,157 Year Ended November 2, 2019 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 2,562,841 $ — $ — $ — $ 2,562,841 Routing and Switching 348,477 — — — 348,477 Platform Software and Services — 155,376 — — 155,376 Blue Planet Automation Software and Services — — 54,555 — 54,555 Maintenance Support and Training — — — 261,337 261,337 Installation and Deployment — — — 148,233 148,233 Consulting and Network Design — — — 41,312 41,312 Total revenue by product line $ 2,911,318 $ 155,376 $ 54,555 $ 450,882 $ 3,572,131 Timing of revenue recognition: Products and services at a point in time $ 2,911,318 $ 55,530 $ 17,697 $ 18,802 $ 3,003,347 Products and services transferred over time — 99,846 36,858 432,080 568,784 Total revenue by timing of revenue recognition $ 2,911,318 $ 155,376 $ 54,555 $ 450,882 $ 3,572,131 Ciena reports its sales geographically around the following markets: (i) Americas; (ii) EMEA; and (iii) APAC. Americas includes activities in North America and South America. Within each geographic area, Ciena maintains specific teams or personnel that focus on a particular region, country, customer or market vertical. These teams include sales management, account salespersons and sales engineers, as well as services professionals and commercial management personnel. The following table reflects Ciena’s geographic distribution of revenue 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 30, 2021 October 31, 2020 November 2, 2019 Geographic distribution: Americas $ 2,525,619 $ 2,469,278 $ 2,503,913 EMEA 670,462 591,468 566,718 APAC 424,603 471,411 501,500 Total revenue by geographic distribution $ 3,620,684 $ 3,532,157 $ 3,572,131 Ciena’s revenue includes United States revenue of $2.27 billion for fiscal 2021 and $2.25 billion for both fiscal 2020 and 2019. 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 30, 2021 October 31, 2020 November 2, 2019 AT&T $ 447,403 $ 373,163 $ 388,704 Verizon n/a n/a 459,787 Web-scale provider n/a n/a 370,577 Total $ 447,403 $ 373,163 $ 1,219,068 ________________________________ n/a Denotes revenue representing less than 10% of total revenue for the period The Web-scale provider noted in the above table purchased products from each of Ciena’s operating segments excluding Blue Planet ® Automation Software and Services. The other customers identified above purchased products and services from each of Ciena’s operating segments. While Ciena has benefited from the diversification of its business and customer base, its ten largest customers contributed 55.5% of fiscal 2021 revenue, 54.5% of fiscal 2020 revenue and 59.3% of fiscal 2019 revenue. ◦ Networking Platforms revenue reflects sales of Ciena’s Converged Packet Optical and Routing and Switching product lines . ▪ Converged Packet Optical - includes the 6500 Packet-Optical Platform, the Waveserver ® stackable interconnect system, the 6500 Reconfigurable Line System (RLS), the 5400 family of Packet-Optical Platforms, and the Coherent ELS open line system (OLS). This product line also includes sales of the Z-Series Packet-Optical Platform. ▪ Routing and Switching - includes the 3900 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, and the 8700 Packetwave Platform. 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 provides analytics, data, and planning tools to assist customers in managing Ciena’s Networking Platforms products in their networks. Ciena’s platform software includes its Manage, Control and Plan (MCP) domain controller solution 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, micro-services, standards-based open software suite, together with related services, that enables customers to implement large-scale software and IT-led operations support system (OSS) transformations by transforming legacy networks into “service ready” networks, accelerating the creation, delivery and lifecycle management of new, cloud-based services. Ciena’s Blue Planet Automation Platform includes multi-domain service orchestration (MDSO), inventory management (BPI), route optimization and analysis (ROA), network function virtualization orchestration (NFVO), and unified assurance and analytics (UAA). Services revenue includes sales of subscription, installation, support, consulting and design services related to Ciena’s Blue Planet Automation Platform. Revenue from the software portion of this segment is included in product revenue on the 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 30, 2021 Balance at October 31, 2020 Accounts receivable, net $ 884,958 $ 719,405 Contract assets for unbilled accounts receivable, net $ 101,355 $ 85,843 Deferred revenue $ 175,464 $ 158,363 Ciena’s contract assets represent unbilled accounts receivable, net, where transfer of a product or service has occurred but invoicing is conditional upon completion of future performance obligations. These amounts are primarily related to installation and deployment and professional services arrangements where transfer of control has occurred, but Ciena has not yet invoiced the customer. Contract assets are included in prepaid expenses and other current assets in the Consolidated Balance Sheets. See Note 11 below. Contract liabilities consist of deferred revenue and represent advanced payments against non-cancelable customer orders received prior to revenue recognition. Ciena recognized approximately $106.5 million and $101.9 million of revenue during fiscal 2021 and 2020, respectively, that was included in the deferred revenue balance at October 31, 2020 and November 2, 2019, respectively. Revenue recognized due to changes in transaction price from performance obligations satisfied or partially satisfied in previous periods was immaterial during fiscal 2021 and 2020. Capitalized Contract Acquisition Costs Capitalized contract acquisition costs consist of deferred sales commissions and were $27.6 million and $15.3 million as of October 30, 2021 and October 31, 2020, respectively, and are included in prepaid expenses and other and other long-term assets. The amortization expense associated with these costs was $24.6 million and $22.4 million during fiscal 2021 and fiscal 2020, respectively, and are included in sales and marketing expense. Remaining Performance Obligations

CANADIAN EMERGENCY WAGE SUBSIDY

CANADIAN EMERGENCY WAGE SUBSIDY	12 Months Ended
	Oct. 30, 2021
Unusual or Infrequent Items, or Both [Abstract]
CANADIAN EMERGENCY WAGE SUBSIDY	CANADIAN EMERGENCY WAGE SUBSIDY In April 2020, the Canadian government introduced the Canada Emergency Wage Subsidy (“CEWS”) to help employers offset a portion of their employee wages for a limited period in response to the COVID-19 outbreak, retroactive to March 15, 2020. The CEWS program expired October 2021. The subsidy covers employers of all sizes and across all sectors. Ciena accounts for proceeds from government grants as a reduction of expense when there is reasonable assurance that Ciena has met the required conditions associated with the grant and that grant proceeds will be received. Grant benefits are recorded to the particular line item of the Consolidated Statement 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. As of October 30, 2021, no amounts were receivable from this subsidy. The following table summarizes CEWS for the periods indicated (in thousands): Year Ended October 30, October 31, 2021 2020 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. 30, 2021
Business Combination and Asset Acquisition [Abstract]
BUSINESS COMBINATIONS	BUSINESS COMBINATIONS Centina Systems, Inc. Acquisition On November 2, 2019, Ciena acquired Centina Systems, Inc. (“Centina”), a provider of service assurance analytics and network performance management solutions, for approximately $34.0 million in cash. This transaction has been accounted for as the acquisition of a business. The following table summarizes the final purchase price allocation related to the acquisition based on the estimated fair value of the acquired assets and assumed liabilities (in thousands): Amount Cash and cash equivalents $ 5,718 Accounts receivable 610 Prepaid expenses and other 536 Equipment, furniture and fixtures 17 Goodwill 13,055 Customer relationships and contracts 400 Developed technology 22,200 Accounts payable (47) Accrued liabilities (286) Deferred revenue (1,493) Deferred tax liability (6,692) Total purchase consideration $ 34,018 Customer relationships and contracts represent agreements with existing Centina customers and have an estimated useful life of two years. Developed technology represents purchased technology that has reached technological feasibility and for which Centina had substantially completed development as of the date of acquisition. Fair value was determined using future discounted cash flows related to the projected income stream of the developed technology for a discrete projection period. Cash flows were discounted to their present value as of the closing date. Developed technology is amortized on a straight-line basis over its estimated useful life of five years. The goodwill generated from the acquisition of Centina is primarily related to expected economic synergies. The total goodwill amount was recorded in the Blue Planet Automation Software and Services segment. The goodwill is not deductible for income tax purposes. Pro forma disclosures have not been included due to immateriality.

RESTRUCTURING COSTS

RESTRUCTURING COSTS	12 Months Ended
	Oct. 30, 2021
Restructuring and Related Activities [Abstract]
RESTRUCTURING COSTS	RESTRUCTURING COSTSCiena 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 November 3, 2018 $ 2,108 $ 1,739 $ 3,847 Charges 13,779 (1) 10,759 (4) 24,538 Cash payments (11,904) (1,338) (13,242) Balance at November 2, 2019 3,983 11,160 15,143 Charges 7,282 (2) 15,370 (5) 22,652 Adjustments related to ASC 842 — (11,160) (6) (11,160) Cash payments (8,350) (15,370) (23,720) Balance at October 31, 2020 2,915 — 2,915 Charges 5,938 (3) 23,627 (7) 29,565 Cash payments (8,072) (23,627) (31,699) Balance at October 30, 2021 $ 781 $ — $ 781 Current restructuring liabilities $ 781 $ — $ 781 _________________________________ (1) During fiscal 2019, Ciena recorded a charge of $13.8 million of severance and other employee-related costs associated with a workforce reduction of approximately 283 employees. (2) During fiscal 2020, Ciena recorded a charge of $7.3 million of severance and other employee-related costs associated with a workforce reduction of approximately 149 employees. (3) During fiscal 2021, Ciena recorded a charge of $5.9 million of severance and other employee-related costs associated with a workforce reduction of approximately 133 employees. (4) Reflects unfavorable lease commitments in connection with a portion of facilities located in Alpharetta, Georgia, Spokane, Washington, Durham, North Carolina and Hanover, Maryland. (5) Primarily represents costs and imputed interest expense related to restructured facilities and the redesign of certain business processes. (6) Represents restructuring reserve liability recognized as a reduction to Operating ROU assets, net in relation to adoption of ASC 842. (7) Primarily represents the redesign of certain business processes associated with Ciena’s supply chain and distribution structure reorganization, and costs related to restructured facilities.

INTEREST AND OTHER INCOME (LOSS

INTEREST AND OTHER INCOME (LOSS), NET	12 Months Ended
	Oct. 30, 2021
Other Income and Expenses [Abstract]
INTEREST AND OTHER INCOME (LOSS), NET	INTEREST AND OTHER INCOME (LOSS), NET The components of interest and other income (loss), net, were as follows (in thousands): Year Ended October 30, 2021 October 31, 2020 November 2, 2019 Interest income $ 2,051 $ 6,860 $ 14,410 Gain on non-hedge designated foreign currency forward contracts 11,172 5,551 3 Foreign currency exchange losses (14,622) (13,022) (9,800) Other (369) 1,575 (737) Interest and other income (loss), net $ (1,768) $ 964 $ 3,876 Ciena Corporation, as the U.S. parent entity, uses the U.S. Dollar as its functional currency; however, some of its foreign branch offices and subsidiaries use the local currency as their functional currency. During fiscal 2021, 2020 and 2019, Ciena recorded $14.6 million, $13.0 million and $9.8 million, respectively, in exchange rate losses, as a result of monetary assets and liabilities that were transacted in a currency other than the entity’s functional currency, and the related remeasurement adjustments were recorded in interest and other income (loss), net. From time to time, Ciena uses foreign currency forwards to hedge certain of these balance sheet exposures. These forwards are not designated as hedges for accounting purposes, and any net gain or loss associated with these derivatives is also reported in interest and other income (loss), net. During fiscal 2019,

SHORT-TERM AND LONG-TERM INVEST

SHORT-TERM AND LONG-TERM INVESTMENTS	12 Months Ended
	Oct. 30, 2021
Investments, Debt and Equity Securities [Abstract]
SHORT-TERM AND LONG-TERM INVESTMENTS	SHORT-TERM AND LONG-TERM INVESTMENTS As of the dates indicated, investments are comprised of the following (in thousands): October 30, 2021 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations: Included in short-term investments $ 181,488 $ 5 $ (10) $ 181,483 Included in long-term investments 70,225 — (187) 70,038 $ 251,713 $ 5 $ (197) $ 251,521 October 31, 2020 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations: Included in short-term investments $ 150,559 $ 109 $ (1) $ 150,667 Included in long-term investments 82,252 — (26) 82,226 $ 232,811 $ 109 $ (27) $ 232,893 The following table summarizes the legal maturities of debt investments at October 30, 2021 (in thousands): October 30, 2021 Amortized Cost Estimated Fair Less than one year $ 181,488 $ 181,483 Due in 1-2 years 70,225 70,038 $ 251,713 $ 251,521

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Oct. 30, 2021
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTSAs 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 30, 2021 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 1,120,851 $ — $ — $ 1,120,851 Bond mutual fund 75,425 — — 75,425 Time deposits 30,036 — — 30,036 Deferred compensation plan assets 12,968 — — 12,968 U.S. government obligations — 251,521 — 251,521 Foreign currency forward contracts — 14,935 — 14,935 Total assets measured at fair value $ 1,239,280 $ 266,456 $ — $ 1,505,736 Liabilities: Foreign currency forward contracts $ — $ 716 $ — $ 716 Forward starting interest rate swaps — 15,928 — 15,928 Total liabilities measured at fair value $ — $ 16,644 $ — $ 16,644 October 31, 2020 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 889,293 $ — $ — $ 889,293 Bond mutual fund 50,361 — — $ 50,361 Deferred compensation plan assets 8,213 — — 8,213 U.S. government obligations — 232,893 — 232,893 Foreign currency forward contracts — 82 — 82 Total assets measured at fair value $ 947,867 $ 232,975 $ — $ 1,180,842 Liabilities: Foreign currency forward contracts $ — $ 681 $ — $ 681 Forward starting interest rate swaps — 28,513 — 28,513 Total liabilities measured at fair value $ — $ 29,194 $ — $ 29,194 As of the dates indicated, the assets and liabilities above were presented on Ciena’s Consolidated Balance Sheet as follows (in thousands): October 30, 2021 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 1,226,312 $ — $ — $ 1,226,312 Short-term investments — 181,483 — 181,483 Prepaid expenses and other — 14,935 — 14,935 Long-term investments — 70,038 — 70,038 Other long-term assets 12,968 — — 12,968 Total assets measured at fair value $ 1,239,280 $ 266,456 $ — $ 1,505,736 Liabilities: Accrued liabilities and other short-term obligations $ — $ 716 $ — $ 716 Other long-term obligations — 15,928 — 15,928 Total liabilities measured at fair value $ — $ 16,644 $ — $ 16,644 October 31, 2020 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 939,654 $ — $ — $ 939,654 Short-term investments — 150,667 — 150,667 Prepaid expenses and other — 82 — 82 Other long-term assets 8,213 82,226 — 90,439 Total assets measured at fair value $ 947,867 $ 232,975 $ — $ 1,180,842 Liabilities: Accrued liabilities and other short-term obligations $ — $ 681 $ — $ 681 Other long-term obligations — 28,513 — 28,513 Total liabilities measured at fair value $ — $ 29,194 $ — $ 29,194 Ciena did not have any transfers between Level 1 and Level 2 fair value measurements during the periods presented. As of October 30, 2021, none of Ciena’s existing liabilities were classified as Level 3.

ACCOUNTS RECEIVABLE

ACCOUNTS RECEIVABLE	12 Months Ended
	Oct. 30, 2021
Receivables [Abstract]
ACCOUNTS RECEIVABLE	ACCOUNTS RECEIVABLE As of October 30, 2021, two customers accounted for 15.0% and 10.0% of net accounts receivable, respectively. As of October 31, 2020, no customer accounted for 10.0% of net accounts receivable. 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 (Note 1) Provisions Net Deductions Ending Balance November 2, 2019 $ 17,378 $ — $ 6,740 $ 4,017 $ 20,101 October 31, 2020 (1) $ 20,101 $ — $ 8,855 $ 18,358 $ 10,598 October 30, 2021 $ 10,598 $ 2,206 $ 2,346 $ 4,238 $ 10,912

INVENTORIES

INVENTORIES	12 Months Ended
	Oct. 30, 2021
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES As of the dates indicated, inventories are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Raw materials $ 175,399 $ 119,481 Work-in-process 10,260 13,738 Finished goods 180,800 210,050 Deferred cost of goods sold 44,765 40,747 411,224 384,016 Reserve for excess and obsolescence (36,959) (39,637) $ 374,265 $ 344,379 Ciena writes down its inventory for estimated obsolescence or unmarketable inventory by an amount equal to the difference between the cost of inventory and the estimated net realizable value based on assumptions about future demand, which are affected by changes in Ciena’s strategic direction, discontinuance of a product or introduction of newer versions of products, declines in the sales of or forecasted demand for certain products, and general market conditions. During fiscal 2021, fiscal 2020 and fiscal 2019, Ciena recorded a provision for excess and obsolescence of $17.9 million, $24.7 million, and $28.1 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 to 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 November 2, 2019 $ 50,938 $ 28,085 $ 31,701 $ 47,322 October 31, 2020 $ 47,322 $ 24,701 $ 32,386 $ 39,637 October 30, 2021 $ 39,637 $ 17,850 $ 20,528 $ 36,959

PREPAID EXPENSES AND OTHER

PREPAID EXPENSES AND OTHER	12 Months Ended
	Oct. 30, 2021
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 30, 2021 October 31, 2020 Contract assets for unbilled accounts receivable, net $ 101,355 $ 85,843 Prepaid VAT and other taxes 77,388 72,838 Prepaid expenses 62,189 70,647 Product demonstration equipment, net 29,362 44,793 Capitalized contract acquisition costs 21,753 11,296 Other non-trade receivables 18,408 21,981 Derivative assets 14,935 82 Deferred deployment expense 264 604 $ 325,654 $ 308,084 Depreciation of product demonstration equipment was $9.8 million, $9.0 million and $8.8 million for fiscal 2021, 2020 and 2019, 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. 30, 2021
Property, Plant and Equipment [Abstract]
EQUIPMENT, BUILDING, FURNITURE AND FIXTURES	EQUIPMENT, BUILDING, FURNITURE AND FIXTURESAs of the dates indicated, equipment, building, furniture and fixtures are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Equipment, furniture and fixtures $ 599,672 $ 523,231 Building subject to finance lease 76,123 70,791 Leasehold improvements 100,270 89,407 776,065 683,429 Accumulated depreciation and amortization (491,097) (411,052) $ 284,968 $ 272,377

INTANGIBLE ASSETS

INTANGIBLE ASSETS	12 Months Ended
	Oct. 30, 2021
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 30, 2021 October 31, 2020 Gross Accumulated Net Gross Accumulated Net Developed technology $ 395,726 $ (359,828) $ 35,898 $ 395,726 $ (335,512) $ 60,214 Patents and licenses 7,815 (3,321) 4,494 3,565 (2,529) 1,036 Customer relationships, covenants not to compete, outstanding purchase orders and contracts 375,329 (350,407) 24,922 374,659 (339,262) 35,397 Total intangible assets $ 778,870 $ (713,556) $ 65,314 $ 773,950 $ (677,303) $ 96,647 The aggregate amortization expense of intangible assets was $36.0 million, $38.6 million and $35.1 million for fiscal 2021, fiscal 2020 and fiscal 2019, respectively. Expected future amortization of intangible assets for the fiscal years indicated is as follows (in thousands): Fiscal Year Amount 2022 $ 29,935 2023 15,125 2024 12,074 2025 6,865 2026 607 Thereafter 708 $ 65,314

GOODWILL

GOODWILL	12 Months Ended
	Oct. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL	GOODWILL The following table presents the goodwill allocated to Ciena’s operating segments as of October 30, 2021 and October 31, 2020, as well as the changes to goodwill during fiscal 2021 (in thousands): Balance at October 31, 2020 Acquisitions Impairments Translation Balance at October 30, 2021 Platform Software and Services $ 156,191 $ — $ — $ — $ 156,191 Blue Planet Automation Software and Services 89,049 — — — 89,049 Networking Platforms 65,607 — — 798 66,405 Total $ 310,847 $ — $ — $ 798 $ 311,645

OTHER BALANCE SHEET DETAILS

OTHER BALANCE SHEET DETAILS	12 Months Ended
	Oct. 30, 2021
Balance Sheet Related Disclosures [Abstract]
OTHER BALANCE SHEET DETAILS	OTHER BALANCE SHEET DETAILSAs of the dates indicated, other long-term assets are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Maintenance spares inventory, net $ 55,696 $ 62,077 Deferred compensation plan assets 12,968 8,213 Cost method equity investments 8,578 13,408 Capitalized contract acquisition costs 5,803 4,001 Deferred debt issuance costs, net (1) 1,188 1,596 Restricted cash 58 84 Other 15,600 13,451 $ 99,891 $ 102,830 (1) Deferred debt issuance costs relate to Ciena’s senior secured asset-based revolving credit facility (the “ABL Credit Facility”) entered into during fiscal 2019 and its predecessor credit facility (described in Note 20 below). The amortization of deferred debt issuance costs for the ABL Credit Facility and its predecessor is included in interest expense, and was $0.4 million for fiscal 2021 and fiscal 2020, and $0.3 million for fiscal 2019. As of the dates indicated, accrued liabilities and other short-term obligations are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Compensation, payroll related tax and benefits $ 201,119 $ 135,462 Warranty 48,019 49,868 Vacation 31,200 26,945 Income taxes payable 13,577 6,348 Finance lease liabilities 3,620 2,836 Interest payable 598 672 Other 111,152 112,001 $ 409,285 $ 334,132 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 November 2, 2019 $ 44,740 $ 23,105 $ 19,347 $ 48,498 October 31, 2020 $ 48,498 $ 22,417 $ 21,047 $ 49,868 October 30, 2021 $ 49,868 $ 17,093 $ 18,942 $ 48,019 As of the dates indicated, deferred revenue is comprised of the following (in thousands): October 30, 2021 October 31, 2020 Products $ 12,859 $ 17,534 Services 162,605 140,829 175,464 158,363 Less current portion (118,007) (108,700) Long-term deferred revenue $ 57,457 $ 49,663 As of the dates indicated, other long-term obligations are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Finance lease liabilities $ 62,583 $ 61,565 Interest rate swap liability 15,928 28,513 Income tax liability 63,412 16,386 Deferred compensation plan liability 12,877 8,172 Other 12,003 8,549 $ 166,803 $ 123,185

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS	12 Months Ended
	Oct. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS	DERIVATIVE INSTRUMENTS Foreign Currency Derivatives During fiscal 2021 and fiscal 2020, Ciena entered into forward contracts to hedge its foreign exchange exposure from its forecasted cash flows in order to reduce the variability in its Canadian Dollar- and Indian Rupee-denominated expense, which principally relates to research and development activities. The notional amount of these contracts was approximately $288.6 million and $254.9 million as of October 30, 2021 and October 31, 2020, respectively. These foreign exchange contracts have maturities of 24 months or less and have been designated as cash flow hedges. During fiscal 2021 and fiscal 2020, Ciena had forward contracts to hedge its foreign exchange exposure in order to reduce the variability in various currencies of certain balance sheet items. The notional amount of these contracts was approximately $296.1 million and $212.0 million as of October 30, 2021 and October 31, 2020. These foreign exchange contracts have maturities of 12 months or less and have not been designated as hedges for accounting purposes. Interest Rate Derivatives Ciena is exposed to floating rates of LIBOR interest on its term loan borrowings (see Note 19 below) and has hedged such risk by entering into floating to fixed interest rate swap arrangements (“interest rate swaps”). The interest rate swaps fix the LIBOR rate of approximately $350.0 million of the principal amount of the New 2025 Term Loan at 2.957% through September 2023. The total notional amount of these interest rate swaps in effect as of October 30, 2021 was $350.0 million. Ciena expects the variable rate payments to be received under the terms of the interest rate swaps to offset exactly the forecasted variable rate payments on the equivalent notional amounts of the term loan. These derivative contracts have been designated as cash flow hedges. Other information regarding Ciena’s derivatives is immaterial for separate financial statement presentation. See Notes 6 and 8 above.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	12 Months Ended
	Oct. 30, 2021
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 Cumulative Available-for-Sale Securities Foreign Forward Starting Interest Rate Swaps Foreign Total Balance at November 3, 2018 $ (425) $ (3,060) $ 6,417 $ (8,712) $ (5,780) Other comprehensive gain (loss) before reclassifications 577 14 (18,948) (763) (19,120) Amounts reclassified from AOCI — 3,971 (1,155) — 2,816 Balance at November 2, 2019 152 925 (13,686) (9,475) (22,084) Other comprehensive loss before reclassifications (107) (3,891) (12,302) (4,174) (20,474) Amounts reclassified from AOCI — 2,747 4,453 — 7,200 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 All amounts reclassified from AOCI related to settlement (gains) losses on foreign currency forward contracts designated as cash flow hedges impacted revenue, research and development expense or sales and marketing expense on the Consolidated Statements of Operations. All amounts reclassified from AOCI related to settlement (gains) losses on forward starting interest rate swaps designated as cash flow hedges impacted interest and other income (loss), net on the Consolidated Statements of Operations.

LEASES

LEASES	12 Months Ended
	Oct. 30, 2021
Leases [Abstract]
LEASES	LEASES Ciena leases over 1.3 million square feet of facilities globally. Ciena’s principal executive offices are located in Hanover, Maryland. Ciena’s largest facilities are research and development centers located in Ottawa, Canada and Gurgaon, India. Ciena also has engineering facilities located in San Jose, California; Alpharetta, Georgia; Quebec, Canada; and Pune and Bangalore, India. In addition, Ciena leases various smaller offices in regions throughout the world to support sales and services operations. Office facilities are leased under various non-cancelable operating or finance leases. Ciena's current leases have remaining terms that vary up to 11 years. Certain leases provide for options to extend up to ten years and/or options to terminate within five years. Leases included in the Consolidated Balance Sheets for the fiscal periods indicated were as follows (in thousands): Classification Balance as of October 30, 2021 Balance as of October 31, 2020 Operating leases: Operating ROU Assets Operating right-of-use assets $ 44,285 $ 57,026 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities 60,196 80,450 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 76,123 $ 70,791 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (24,027) (17,837) Buildings, net $ 52,096 $ 52,954 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 66,203 $ 64,401 ROU assets that involve subleased or vacant space aggregate $3.5 million as of October 30, 2021. These assets may become impaired if tenants are unable to service their obligations under the sublease, and/or if the estimates as to occupancy are not realized, either of which may be more likely as COVID-19 impacts evolve. For the periods indicated, the components of lease expense included in the Consolidated Statement of Operations were as follows (in thousands): Year Ended Year Ended Classification October 30, 2021 October 31, 2020 Operating lease costs Operating expense $ 16,602 $ 17,544 Finance lease cost: Amortization of finance ROU asset Operating expense 4,773 4,465 Interest on finance lease liabilities Interest expense 4,882 4,777 Total finance lease cost 9,655 9,242 Non-capitalized lease cost Operating expense 1,152 2,976 Variable lease cost (1) Operating expense 5,690 5,185 Net lease cost (2) $ 33,099 $ 34,947 (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 $8.8 million and $11.0 million for the fiscal years ended October 30, 2021 and October 31, 2020, respectively, related to amortization of leasehold improvements. Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of October 30, 2021 were as follows (in thousands): Operating Leases Finance Leases Total 2022 $ 19,882 $ 8,338 $ 28,220 2023 15,153 8,557 23,710 2024 12,264 8,557 20,821 2025 7,935 8,730 16,665 2026 4,408 8,764 13,172 Thereafter 3,860 53,714 57,574 Total lease payments 63,502 96,660 160,162 Less: Imputed interest (3,306) (30,457) (33,763) Present value of lease liabilities 60,196 66,203 126,399 Less: Current portion of present value of minimum lease payments 18,632 3,620 22,252 Long-term portion of present value of minimum lease payments $ 41,564 $ 62,583 $ 104,147 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 30, 2021 As of October 31, 2020 Operating leases 4.06 4.87 Finance leases 10.71 11.71 Weighted-average discount rates: Operating leases 2.49 % 2.82 % Finance leases 7.56 % 7.56 %
LEASES	LEASES Ciena leases over 1.3 million square feet of facilities globally. Ciena’s principal executive offices are located in Hanover, Maryland. Ciena’s largest facilities are research and development centers located in Ottawa, Canada and Gurgaon, India. Ciena also has engineering facilities located in San Jose, California; Alpharetta, Georgia; Quebec, Canada; and Pune and Bangalore, India. In addition, Ciena leases various smaller offices in regions throughout the world to support sales and services operations. Office facilities are leased under various non-cancelable operating or finance leases. Ciena's current leases have remaining terms that vary up to 11 years. Certain leases provide for options to extend up to ten years and/or options to terminate within five years. Leases included in the Consolidated Balance Sheets for the fiscal periods indicated were as follows (in thousands): Classification Balance as of October 30, 2021 Balance as of October 31, 2020 Operating leases: Operating ROU Assets Operating right-of-use assets $ 44,285 $ 57,026 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities 60,196 80,450 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 76,123 $ 70,791 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (24,027) (17,837) Buildings, net $ 52,096 $ 52,954 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 66,203 $ 64,401 ROU assets that involve subleased or vacant space aggregate $3.5 million as of October 30, 2021. These assets may become impaired if tenants are unable to service their obligations under the sublease, and/or if the estimates as to occupancy are not realized, either of which may be more likely as COVID-19 impacts evolve. For the periods indicated, the components of lease expense included in the Consolidated Statement of Operations were as follows (in thousands): Year Ended Year Ended Classification October 30, 2021 October 31, 2020 Operating lease costs Operating expense $ 16,602 $ 17,544 Finance lease cost: Amortization of finance ROU asset Operating expense 4,773 4,465 Interest on finance lease liabilities Interest expense 4,882 4,777 Total finance lease cost 9,655 9,242 Non-capitalized lease cost Operating expense 1,152 2,976 Variable lease cost (1) Operating expense 5,690 5,185 Net lease cost (2) $ 33,099 $ 34,947 (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 $8.8 million and $11.0 million for the fiscal years ended October 30, 2021 and October 31, 2020, respectively, related to amortization of leasehold improvements. Future minimum lease payments and the present value of minimum lease payments related to operating and finance leases as of October 30, 2021 were as follows (in thousands): Operating Leases Finance Leases Total 2022 $ 19,882 $ 8,338 $ 28,220 2023 15,153 8,557 23,710 2024 12,264 8,557 20,821 2025 7,935 8,730 16,665 2026 4,408 8,764 13,172 Thereafter 3,860 53,714 57,574 Total lease payments 63,502 96,660 160,162 Less: Imputed interest (3,306) (30,457) (33,763) Present value of lease liabilities 60,196 66,203 126,399 Less: Current portion of present value of minimum lease payments 18,632 3,620 22,252 Long-term portion of present value of minimum lease payments $ 41,564 $ 62,583 $ 104,147 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 30, 2021 As of October 31, 2020 Operating leases 4.06 4.87 Finance leases 10.71 11.71 Weighted-average discount rates: Operating leases 2.49 % 2.82 % Finance leases 7.56 % 7.56 %

SHORT-TERM AND LONG-TERM DEBT

SHORT-TERM AND LONG-TERM DEBT	12 Months Ended
	Oct. 30, 2021
Debt Disclosure [Abstract]
SHORT-TERM AND LONG-TERM DEBT	SHORT-TERM AND LONG-TERM DEBT 2025 Term Loan On January 23, 2020, Ciena entered into a Refinancing Amendment to Credit Agreement pursuant to which Ciena refinanced the entire outstanding amount of its then existing senior secured term loan and incurred a new senior secured term loan in an aggregate principal amount of $693.0 million and maturing on September 28, 2025 (the “2025 Term Loan”). The net carrying value of Ciena’s term loan was comprised of the following for the fiscal periods indicated (in thousands): October 30, 2021 October 31, 2020 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2025 Term Loan $ 680,873 $ (1,250) $ (2,338) $ 677,285 $ 683,286 Deferred debt issuance costs deducted from the carrying amount of the term loan totaled $2.3 million at October 30, 2021 and $2.9 million at October 31, 2020. Deferred debt issuance costs are amortized using the straight-line method, which approximates the effect of the effective interest rate method, through the maturity of the term loan. The amortization of deferred debt issuance costs for this term loan is included in interest expense, and was $0.6 million during each of fiscal 2021 and fiscal 2020. As of October 30, 2021, the estimated fair value of the term loan was $680.0 million. Ciena’s term loan is categorized as Level 2 in the fair value hierarchy. Ciena estimated the fair value of its term loan using a market approach based on observable inputs, such as current market transactions involving comparable securities. Ciena Corporation and certain of its subsidiaries are parties to the ABL Credit Facility, which provides for a total commitment of $300 million with a maturity date of October 28, 2024. The ABL Credit Facility was entered into on October 28, 2019 and replaced a predecessor senior secured asset-based revolving credit facility. Ciena principally uses the ABL Credit Facility to support the issuance of letters of credit that arise in the ordinary course of its business and thereby to reduce its use of cash required to collateralize these instruments. As of October 30, 2021, letters of credit totaling $87.4 million were outstanding under the ABL Credit Facility. There were no borrowings outstanding under the ABL Credit Facility as of October 30, 2021.

ABL CREDIT FACILITY

ABL CREDIT FACILITY	12 Months Ended
	Oct. 30, 2021
Line of Credit Facility [Abstract]
ABL CREDIT FACILITY	SHORT-TERM AND LONG-TERM DEBT 2025 Term Loan On January 23, 2020, Ciena entered into a Refinancing Amendment to Credit Agreement pursuant to which Ciena refinanced the entire outstanding amount of its then existing senior secured term loan and incurred a new senior secured term loan in an aggregate principal amount of $693.0 million and maturing on September 28, 2025 (the “2025 Term Loan”). The net carrying value of Ciena’s term loan was comprised of the following for the fiscal periods indicated (in thousands): October 30, 2021 October 31, 2020 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2025 Term Loan $ 680,873 $ (1,250) $ (2,338) $ 677,285 $ 683,286 Deferred debt issuance costs deducted from the carrying amount of the term loan totaled $2.3 million at October 30, 2021 and $2.9 million at October 31, 2020. Deferred debt issuance costs are amortized using the straight-line method, which approximates the effect of the effective interest rate method, through the maturity of the term loan. The amortization of deferred debt issuance costs for this term loan is included in interest expense, and was $0.6 million during each of fiscal 2021 and fiscal 2020. As of October 30, 2021, the estimated fair value of the term loan was $680.0 million. Ciena’s term loan is categorized as Level 2 in the fair value hierarchy. Ciena estimated the fair value of its term loan using a market approach based on observable inputs, such as current market transactions involving comparable securities. Ciena Corporation and certain of its subsidiaries are parties to the ABL Credit Facility, which provides for a total commitment of $300 million with a maturity date of October 28, 2024. The ABL Credit Facility was entered into on October 28, 2019 and replaced a predecessor senior secured asset-based revolving credit facility. Ciena principally uses the ABL Credit Facility to support the issuance of letters of credit that arise in the ordinary course of its business and thereby to reduce its use of cash required to collateralize these instruments. As of October 30, 2021, letters of credit totaling $87.4 million were outstanding under the ABL Credit Facility. There were no borrowings outstanding under the ABL Credit Facility as of October 30, 2021.

EARNINGS PER SHARE CALCULATION

EARNINGS PER SHARE CALCULATION	12 Months Ended
	Oct. 30, 2021
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 30, 2021 October 31, 2020 November 2, 2019 Net income $ 500,196 $ 361,291 $ 253,434 Basic weighted average shares outstanding 155,279 154,287 155,720 Effect of dilutive potential common shares 1,464 1,668 1,892 Diluted weighted average shares 156,743 155,955 157,612 Basic EPS $ 3.22 $ 2.34 $ 1.63 Diluted EPS $ 3.19 $ 2.32 $ 1.61 Antidilutive employee share-based awards, excluded 110 263 234

STOCKHOLDERS_ EQUITY

STOCKHOLDERS’ EQUITY	12 Months Ended
	Oct. 30, 2021
Equity [Abstract]
STOCKHOLDERS' EQUITY	STOCKHOLDERS’ EQUITY Stock Repurchase Program On December 13, 2018, Ciena announced that its Board of Directors authorized a program to repurchase up to $500 million of Ciena’s common stock. After temporarily suspending repurchases of Ciena’s common stock during fiscal 2020, Ciena reinstituted its stock repurchase program in the first quarter of 2021. See Note 28 for further information regarding updates to our share repurchase program. The following table summarizes activity of the stock repurchase program, reported based on trade date: Shares Repurchased Weighted-Average Price per Share Amount Repurchased (in thousands) Cumulative balance at November 2, 2019 3,838,466 $ 39.10 $ 150,076 Repurchase of common stock under the stock repurchase program 1,872,446 $ 39.81 74,535 Cumulative balance at October 31, 2020 5,710,912 $ 39.33 $ 224,611 Repurchase of common stock under the stock repurchase program 1,696,949 $ 54.27 92,088 Cumulative balance at October 30, 2021 7,407,861 $ 42.75 $ 316,699 The purchase price for the shares of Ciena’s stock repurchased is reflected as a reduction of common stock and additional paid-in capital. Stock Repurchases Related to 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 purchase price of $44.1 million for the shares of Ciena’s stock repurchased 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. 30, 2021
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 30, 2021 October 31, 2020 November 2, 2019 Provision (benefit) for income taxes: Current: Federal $ 72,603 $ 4,363 $ 13,143 State 21,400 13,328 16,945 Foreign 25,021 12,640 9,816 Total current 119,024 30,331 39,904 Deferred: Federal (21,942) 60,679 31,872 State (11,546) 4,607 (9,159) Foreign (122,981) (947) (2,861) Total deferred (156,469) 64,339 19,852 Provision (benefit) for income taxes $ (37,445) $ 94,670 $ 59,756 For the periods indicated, income before provision (benefit) for income taxes consists of the following (in thousands): Year Ended October 30, 2021 October 31, 2020 November 2, 2019 United States $ 298,514 $ 387,697 $ 256,461 Foreign 164,237 68,264 56,729 Total $ 462,751 $ 455,961 $ 313,190 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 2021, fiscal 2020 and fiscal 2019 as follows: Year Ended October 30, 2021 October 31, 2020 November 2, 2019 Provision at statutory rate 21.00 % 21.00 % 21.00 % Intercompany IP Restructuring Transaction (25.85) % — % — % Base Erosion and Anti-Abuse Tax — % (1.02) % 3.60 % State taxes 3.73 % 2.21 % 2.18 % Foreign taxes 2.76 % 0.51 % (0.37) % Research and development credit (7.99) % (7.74) % (7.53) % Non-deductible compensation 1.68 % 1.79 % 1.01 % Foreign Derived Intangible Income (1.82) % (2.07) % — % Transition tax — % 0.02 % 0.29 % Rate Change (4.33) % 3.04 % (0.41) % Valuation allowance 1.77 % 3.58 % (2.13) % Other 0.96 % (0.56) % 1.44 % Effective income tax rate (8.09) % 20.76 % 19.08 % 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 utilizability of tax attributes and changes in tax laws and business reorganizations. Ciena continues to monitor these items and will adopt strategies to address their impact as appropriate. In fiscal 2021, Ciena began implementing a plan to reorganize its global supply chain and distribution structure more substantially, which includes a legal entity reorganization and related system upgrade. Ciena completed the first phase of this plan in fiscal 2021, and expects to continue to implement the plan during the first half of 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 DTA are as follows (in thousands): Year Ended October 30, 2021 October 31, 2020 Deferred tax assets: Reserves and accrued liabilities $ 69,950 $ 73,825 Depreciation and amortization 677,729 504,233 NOL and credit carry forward 165,087 188,157 Other 47,048 33,017 Gross deferred tax assets 959,814 799,232 Valuation allowance (159,634) (151,427) Deferred tax asset, net of valuation allowance $ 800,180 $ 647,805 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 November 3, 2018 $ 96,363 Increase related to positions taken in current period 1,959 Reductions related to settlements with taxing authorities (1,224) Reductions related to expiration of statute of limitations (2,494) Unrecognized tax benefits at November 2, 2019 94,604 Increase related to positions taken in prior period 653 Increase related to positions taken in current period 1,151 Reductions related to expiration of statute of limitations (660) 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 As of October 30, 2021 and October 31, 2020, Ciena had accrued $3.8 million and $3.9 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 $0.1 million and $1.0 million were recorded as a net benefit to the provision for income taxes during fiscal 2021 and fiscal 2019, respectively. During fiscal 2020, Ciena recorded a provision for interest and penalties in its provision for income taxes of $0.9 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. Ciena has not provided for U.S. deferred income taxes on the cumulative unremitted earnings of its non-U.S. affiliates, as it plans to indefinitely reinvest these foreign earnings outside the U.S. As of October 30, 2021, the cumulative amount of such temporary differences for which a deferred tax liability has not been recognized is an estimated $475.0 million. If these earnings were distributed to the U.S., Ciena would be subject to additional foreign withholding taxes of approximately $32.0 million. Additionally, there are no other significant temporary differences for which a deferred tax liability has not been recognized. As of October 30, 2021, Ciena continues to maintain a valuation allowance of $159.6 million against its against 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 November 2, 2019 $ 142,650 $ 27,459 $ 34,131 $ 135,978 October 31, 2020 $ 135,978 $ 25,749 $ 10,300 $ 151,427 October 30, 2021 $ 151,427 $ 17,897 $ 9,690 $ 159,634

SHARE-BASED COMPENSATION EXPENS

SHARE-BASED COMPENSATION EXPENSE	12 Months Ended
	Oct. 30, 2021
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 its Amended and Restated 2003 Employee Stock Purchase Plan (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 will also be 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 30, 2021, the total number of shares authorized for issuance under the 2017 Plan was 21.1 million and approximately 12.0 million shares remained available for issuance thereunder. Stock Options There were no stock options granted by Ciena during fiscal 2021, fiscal 2020 or fiscal 2019. 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 as of October 31, 2020 107 $ 31.41 Granted — — Exercised (19) $ 30.13 Canceled (5) $ 18.22 Balance as of October 30, 2021 83 $ 32.46 The total intrinsic value of options exercised during fiscal 2021, fiscal 2020 and fiscal 2019 was $0.5 million, $1.3 million and $0.8 million, respectively. The following table summarizes information with respect to stock options outstanding at October 30, 2021, based on Ciena’s closing stock price on the last trading day of Ciena’s fiscal 2021 (shares and intrinsic value in thousands): Options Outstanding and Vested at October 30, 2021 Number Weighted Weighted Range of of Contractual Average Aggregate Exercise Underlying Life Exercise Intrinsic Price Shares (Years) Price Value $ 11.34 — $ 18.22 33 1.61 $ 14.36 $ 1,334 $ 32.06 — $ 55.63 50 1.46 $ 44.69 487 $ 11.34 — $ 55.63 83 1.52 $ 32.46 $ 1,821 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 2021, fiscal 2020 or fiscal 2019. 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 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 shareholder 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 shareholder 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 shareholder 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 2021, fiscal 2020 and fiscal 2019 included the following: Year Ended October 30, 2021 October 31, 2020 November 2, 2019 Expected volatility of Ciena common stock, which is a weighted average of implied volatility and historical volatility 41.00% 31.77% 34.10% Historical volatility of Ciena common stock 42.80% 36.29% 36.80% Historical volatility of S&P Networking Index 27.30% 18.40% 17.39% Correlation coefficient 0.6800 0.5891 0.6251 Expected life in years 2.87 2.87 2.87 Risk-free interest rate 0.17% 1.65% 2.62% 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 as of October 31, 2020 4,049 $ 35.08 $ 159,498 Granted 2,350 Vested (2,079) Canceled or forfeited (236) Balance as of October 30, 2021 4,084 $ 43.67 $ 221,733 As of October 30, 2021 and October 31, 2020, 0.3 million and 0.4 million of the total restricted stock units outstanding are performance based awards subject to total shareholder return, respectively. The total fair value of restricted stock units that vested and were converted into common stock during fiscal 2021, fiscal 2020 and fiscal 2019 was $110.0 million, $83.5 million and $79.2 million, respectively. The weighted average fair value of each restricted stock unit granted by Ciena during fiscal 2021, fiscal 2020 and fiscal 2019 was $48.70, $41.61 and $34.53, respectively. Amended and Restated ESPP Ciena makes shares of its common stock available for purchase under its Amended and Restated Ciena Corporation Employee Stock Purchase Plan (the “ESPP”). Under the ESPP, eligible employees may enroll in a twelve-month offer period that begins in December and June of each year. Each offer period includes two six-month purchase periods. Employees may purchase a limited number of shares of Ciena common stock at 85% of the fair market value on either the day immediately preceding the offer date or the purchase date, whichever is lower. The ESPP is considered compensatory for purposes of share-based compensation expense. On January 29, 2021, Ciena’s Board of Directors adopted an amendment and restatement of the ESPP to increase the number of shares available for issuance thereunder by 8.7 million and to eliminate the evergreen mechanism thereunder, which became effective upon its approval by Ciena’s stockholders on April 1, 2021. Unless earlier terminated, the ESPP will terminate on April 1, 2031. During fiscal 2021, fiscal 2020 and fiscal 2019, Ciena issued 0.7 million, 0.7 million and 1.0 million shares under the ESPP, respectively. At October 30, 2021, 12.9 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 30, 2021 October 31, 2020 November 2, 2019 Products $ 3,408 $ 3,182 $ 2,868 Services 5,181 3,853 3,175 Share-based compensation expense included in cost of goods sold 8,589 7,035 6,043 Research and development 21,863 16,987 14,321 Sales and marketing 25,152 20,194 16,474 General and administrative 28,804 23,424 22,841 Share-based compensation expense included in operating expense 75,819 60,605 53,636 Share-based compensation expense capitalized in inventory, net (72) 118 57 Total share-based compensation $ 84,336 $ 67,758 $ 59,736 As of October 30, 2021, total unrecognized share-based compensation expense was $143.3 million which relates to unvested restricted stock units and is expected to be recognized over a weighted-average period of 1.51 years.

SEGMENT AND ENTITY WIDE DISCLOS

SEGMENT AND ENTITY WIDE DISCLOSURES	12 Months Ended
	Oct. 30, 2021
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 30, 2021, equipment, building, furniture and fixtures, net, totaled $285.0 million, and operating ROU assets totaled $44.3 million both of which support asset groups within Ciena’s four operating segments and unallocated selling and general and administrative activities. As of October 30, 2021, finite-lived intangible assets, goodwill and maintenance spares are assigned to asset groups within the following segments (in thousands): October 30, 2021 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Other intangible assets, net $ 8,336 $ — $ 56,978 $ — $ 65,314 Goodwill $ 66,405 $ 156,191 $ 89,049 $ — $ 311,645 Maintenance spares, net $ — $ — $ — $ 55,696 $ 55,696 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 30, 2021 October 31, 2020 November 2, 2019 Segment profit (loss): Networking Platforms $ 850,901 $ 827,105 $ 759,244 Platform Software and Services 136,602 105,609 64,210 Blue Planet Automation Software and Services (711) (12,446) (17,769) Global Services 198,521 202,735 188,242 Total segment profit 1,185,313 1,123,003 993,927 Less: non-performance operating expenses Selling and marketing 452,214 416,425 423,046 General and administrative 181,874 169,548 174,399 Significant asset impairments and restructuring costs 29,565 22,652 24,538 Amortization of intangible assets 23,732 23,383 21,808 Acquisition and integration costs 2,572 4,031 3,370 Add: other non-performance financial items Interest and other income (loss), net (1,768) 964 3,876 Interest expense (30,837) (31,321) (37,452) Loss on extinguishment and modification of debt — (646) — Less: Provision (benefit) for income taxes (37,445) 94,670 59,756 Consolidated net income $ 500,196 $ 361,291 $ 253,434 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 30, 2021 October 31, 2020 Canada $ 240,968 $ 214,188 United States 50,744 65,321 Other International 37,541 49,894 Total $ 329,253 $ 329,403

OTHER EMPLOYEE BENEFIT PLANS

OTHER EMPLOYEE BENEFIT PLANS	12 Months Ended
	Oct. 30, 2021
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 (CAD$27,830 (approximately $22,469) for 2021). 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 2021, 2020 and 2019, Ciena made matching contributions of approximately CAD$8.3 million (approximately $6.7 million), CAD$7.0 million (approximately $5.7 million) and CAD$5.2 million (approximately $4.2 million), respectively. Ciena has a 401(k) defined contribution profit sharing plan. 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 2021, 2020 and 2019, Ciena made matching contributions of approximately $8.4 million, $7.5 million and $5.9 million, respectively.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Oct. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Canadian Grant During fiscal 2018, Ciena entered into agreements related to the Evolution of Networking Services through a Corridor in Quebec and Ontario for Research and Innovation (ENCQOR) project with the Canadian federal government, the government of the province of Ontario and the government of the province of Quebec. The purpose of these agreements were to develop a 5G technology corridor between Quebec and Ontario to promote research and development, small business enterprises and entrepreneurs in Canada. Under these agreements, Ciena can receive up to an aggregate CAD$57.6 million (approximately $46.5 million) in reimbursement from the three Canadian government entities for eligible costs over a period commencing on February 20, 2017 and ending on March 31, 2022. Ciena anticipates receiving recurring disbursements over this period. Amounts received under the agreements are subject to recoupment in the event that Ciena fails to achieve certain minimum investment, employment and project milestones. As of October 30, 2021, Ciena has recorded CAD$51.0 million (approximately $41.2 million) in cumulative benefits as a reduction in research and development expense on the Consolidated Statements of Operations, of which CAD$10.4 million (approximately $8.3 million) was recorded in fiscal 2021. As of October 30, 2021, amounts receivable from this grant were CAD$6.1 million (approximately $4.9 million) included in prepaid expenses and other in the Consolidated Balance Sheets. Tax Contingencies Ciena is subject to various tax liabilities arising in the ordinary course of business. Ciena does not expect that the ultimate settlement of these tax liabilities will have a material effect on its results of operations, financial position or cash flows. Litigation Ciena is subject to various legal proceedings, claims and other matters arising in the ordinary course of business, including those that relate to employment, commercial, tax and other regulatory matters. Ciena is also subject to intellectual property related claims, including claims against third parties that may involve contractual indemnification obligations on the part of Ciena. Ciena does not expect that the ultimate costs to resolve such matters will have a material effect on its results of operations, financial position or cash flows.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
	Oct. 30, 2021
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTSVyatta Routing and Switching Technology Acquisition On August 31, 2021, Ciena entered into a definitive agreement with AT&T to acquire its Vyatta virtual routing and switching technology. The acquisition reflects Ciena’s continued investment in its Routing and Switching solutions roadmap and resources. Ciena plans to integrate the engineering personnel hired through this transaction into its Routing and Switching research and development (R&D) organization. The transaction closed during Ciena’s first quarter of fiscal 2022. Stock Repurchase Program and Accelerated Share Repurchase Agreement On December 9, 2021, Ciena announced that its Board of Directors authorized a program to repurchase up to $1.0 billion of its common stock. On December 13, 2021, Ciena entered into an accelerated share repurchase agreement (the “ASR Agreement”) with Goldman, Sachs & Co. (“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 will pay the Repurchase Price to Goldman, and will receive an initial share delivery of approximately 2.7 million shares of its common stock from Goldman, representing approximately 80% of the expected share repurchases under the ASR agreement, based on the closing price of Ciena’s common stock of $74.12 on December 13, 2021. The exact number of shares of common stock Ciena will repurchase under the ASR Agreement will be based generally on the average of the daily volume-weighted average prices of the common stock during the repurchase period under the ASR Agreement, less a discount and subject to adjustments pursuant to the terms and conditions of the ASR Agreement. At settlement, under certain circumstances, Goldman may be required to deliver additional shares of common stock to Ciena, or, under certain circumstances, Ciena may be required to make a cash payment or to deliver shares of its common stock to Goldman. Final settlement of the transactions under the ASR Agreement is expected to occur during the fiscal quarter ending April 30, 2022.

CIENA CORPORATION AND SIGNIFI_2

CIENA CORPORATION AND SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES (Policies)	12 Months Ended
	Oct. 30, 2021
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 30, 2021, October 31, 2020 and November 2, 2019 for the periods reported). Fiscal 2021, fiscal 2020 and fiscal 2019 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 income (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 30, 2021, the combined carrying value of these investments was $8.6 million. 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.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.
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. Ciena tests goodwill impairment 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 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 over useful lives of two 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 right-of-use assets (“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
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.
Maintenance Spares	Maintenance spares are recorded at cost. Spares usage cost is expensed 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 Web-scale 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 ASC 340-40, Other Assets and Deferred Costs; Contracts with Customers , and the interpretations of the Financial Accounting Standards Board (“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 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.
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 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 Statement 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 shareholder 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 shareholder 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 shareholder 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 share 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 share 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 2012 through 2020, in Canada for 2013 through 2015, and in the United Kingdom for 2016 through 2019. 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 (2018), United Kingdom (2016), Canada (2013), and India (2012). 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 has not provided for U.S. deferred income taxes on the cumulative unremitted earnings of its non-U.S. affiliates, as it plans to indefinitely reinvest these foreign earnings outside the U.S. As of October 30, 2021, the cumulative amount of such temporary differences for which a deferred tax liability has not been recognized totaled approximately $475.0 million. If these earnings were distributed to the U.S. in the form of dividends, or otherwise, or if the shares of the relevant foreign subsidiaries were sold or otherwise transferred, Ciena would be subject to additional U.S. income taxes (subject to an adjustment for foreign tax credits) and foreign withholding taxes. Ciena would also be subject to additional foreign withholding taxes of approximately $32.0 million. Additionally, there are no other significant temporary differences for which a deferred tax liability has not been recognized. 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 in fiscal 2019, fiscal 2020 and fiscal 2021, 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 term loan, 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 Statement 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 loan. All of these derivatives are designated as cash flow hedges. At the inception of the cash flow hedge, and on an ongoing basis, Ciena assesses whether the derivative has been effective in offsetting changes in cash flows 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 income (loss), and upon occurrence of the forecasted transaction, is subsequently reclassified to the line item in the Consolidated Statement 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 (Loss) per Share	Ciena calculates basic earnings per share 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 net income per common share (“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 - Effective and Not Yet Effective	In June 2016, the Financial Accounting Standards Board (the ”FASB”) issued Accounting Standards Update No. 2016-13 (“ASU 2016-13”), Financial Instruments - Credit Losses, which requires measurement and recognition of expected credit losses for financial assets held based on historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. Ciena adopted ASU 2016-13 on a modified retrospective basis in the first quarter of fiscal year 2021 through a cumulative-effect adjustment at the beginning of the period of adoption and did not restate prior periods. The standard primarily impacts the value of Ciena’s accounts receivable, net and contract assets for unbilled accounts receivable, net. Adoption of ASU 2016-13 did not have a material effect on Ciena’s financial position or results of operations. In February 2016, the FASB issued ASC 842, Leases, which requires an entity to recognize assets and liabilities on the balance sheet for the rights and obligations created by leased assets and to provide additional disclosures. Effective November 3, 2019, Ciena adopted ASC 842, which requires right-of-use ("ROU") assets and lease liabilities to be recorded on the balance sheet, on a modified retrospective basis, such that related amounts in prior periods have not been restated. In May 2014, the FASB issued ASC 606, Revenue from Contracts with Customers, an accounting standard related to revenue recognition. Upon adopting ASC 606 at the beginning of fiscal 2019, the cumulative effect adjustment reduced accumulated deficit by approximately $49.8 million. 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 is currently evaluating the impact of this accounting standard update on its consolidated financial statements and related disclosures. In March 2020, the FASB issued ASU No. 2020-04 (“ASU 2020-04”), Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ASU 2020-04 provides temporary optional guidance on contract modifications and hedging accounting to ease the financial reporting burdens of the expected market transition from the London Interbank Offered Rate (“LIBOR”) to alternative reference rates. In January 2021, the FASB issued ASU 2021-01, which refines the scope of Topic 848 and clarifies some of its guidance as part of the FASB’s monitoring of global reference rate activities. The new guidance was effective upon issuance, and Ciena is allowed to elect to apply the amendments prospectively through December 31, 2022. Ciena is currently evaluating the impact of this accounting standard update on its consolidated financial statements and related disclosures. In December 2019, the FASB issued ASU No. 2019-12 (“ASU 2019-12”), Income Taxes (ASC 740): Simplifying the Accounting for Income Taxes, which simplifies the accounting for income taxes by removing certain exceptions to the general principles in ASC 740. The amendments also improve consistent application of and simplify GAAP for other areas of ASC 740 by clarifying and amending existing guidance. Most amendments within this standard are required to be applied on a prospective basis, while certain amendments must be applied on a retrospective or modified retrospective basis. ASU 2019-12 is effective for Ciena beginning in the first quarter of fiscal year 2022. Ciena does not expect adoption of ASU 2019-12 to have a material impact on its consolidated financial statements and related disclosures.

REVENUE (Tables)

REVENUE (Tables)	12 Months Ended
	Oct. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of revenue	The tables below set forth Ciena’s disaggregated revenue for the respective period (in thousands): Year Ended October 30, 2021 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 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 Year Ended October 31, 2020 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 2,547,647 $ — $ — $ — $ 2,547,647 Routing and Switching 267,416 — — — 267,416 Platform Software and Services — 197,809 — — 197,809 Blue Planet Automation Software and Services — — 62,632 — 62,632 Maintenance Support and Training — — — 269,354 269,354 Installation and Deployment — — — 152,003 152,003 Consulting and Network Design — — — 35,296 35,296 Total revenue by product line $ 2,815,063 $ 197,809 $ 62,632 $ 456,653 $ 3,532,157 Timing of revenue recognition: Products and services at a point in time $ 2,815,063 $ 69,099 $ 19,583 $ 14,363 $ 2,918,108 Products and services transferred over time — 128,710 43,049 442,290 614,049 Total revenue by timing of revenue recognition $ 2,815,063 $ 197,809 $ 62,632 $ 456,653 $ 3,532,157 Year Ended November 2, 2019 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Product lines: Converged Packet Optical $ 2,562,841 $ — $ — $ — $ 2,562,841 Routing and Switching 348,477 — — — 348,477 Platform Software and Services — 155,376 — — 155,376 Blue Planet Automation Software and Services — — 54,555 — 54,555 Maintenance Support and Training — — — 261,337 261,337 Installation and Deployment — — — 148,233 148,233 Consulting and Network Design — — — 41,312 41,312 Total revenue by product line $ 2,911,318 $ 155,376 $ 54,555 $ 450,882 $ 3,572,131 Timing of revenue recognition: Products and services at a point in time $ 2,911,318 $ 55,530 $ 17,697 $ 18,802 $ 3,003,347 Products and services transferred over time — 99,846 36,858 432,080 568,784 Total revenue by timing of revenue recognition $ 2,911,318 $ 155,376 $ 54,555 $ 450,882 $ 3,572,131 For the periods below, Ciena’s geographic distribution of revenue was as follows (in thousands): Year Ended October 30, 2021 October 31, 2020 November 2, 2019 Geographic distribution: Americas $ 2,525,619 $ 2,469,278 $ 2,503,913 EMEA 670,462 591,468 566,718 APAC 424,603 471,411 501,500 Total revenue by geographic distribution $ 3,620,684 $ 3,532,157 $ 3,572,131 For the periods below, the only customers that accounted for at least 10% of Ciena’s revenue were as follows (in thousands): October 30, 2021 October 31, 2020 November 2, 2019 AT&T $ 447,403 $ 373,163 $ 388,704 Verizon n/a n/a 459,787 Web-scale provider n/a n/a 370,577 Total $ 447,403 $ 373,163 $ 1,219,068 ________________________________ n/a Denotes revenue representing less than 10% of total revenue for the period
Contract balances	The following table provides information about receivables, contract assets and contract liabilities (deferred revenue) from contracts with customers (in thousands): Balance at October 30, 2021 Balance at October 31, 2020 Accounts receivable, net $ 884,958 $ 719,405 Contract assets for unbilled accounts receivable, net $ 101,355 $ 85,843 Deferred revenue $ 175,464 $ 158,363 As of the dates indicated, deferred revenue is comprised of the following (in thousands): October 30, 2021 October 31, 2020 Products $ 12,859 $ 17,534 Services 162,605 140,829 175,464 158,363 Less current portion (118,007) (108,700) Long-term deferred revenue $ 57,457 $ 49,663

CANADIAN EMERGENCY WAGE SUBSI_2

CANADIAN EMERGENCY WAGE SUBSIDY (Tables)	12 Months Ended
	Oct. 30, 2021
Unusual or Infrequent Items, or Both [Abstract]
Schedule of Canadian emergency wage subsidy	The following table summarizes CEWS for the periods indicated (in thousands): Year Ended October 30, October 31, 2021 2020 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. 30, 2021
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 acquisition based on the estimated fair value of the acquired assets and assumed liabilities (in thousands): Amount Cash and cash equivalents $ 5,718 Accounts receivable 610 Prepaid expenses and other 536 Equipment, furniture and fixtures 17 Goodwill 13,055 Customer relationships and contracts 400 Developed technology 22,200 Accounts payable (47) Accrued liabilities (286) Deferred revenue (1,493) Deferred tax liability (6,692) Total purchase consideration $ 34,018

RESTRUCTURING COSTS (Tables)

RESTRUCTURING COSTS (Tables)	12 Months Ended
	Oct. 30, 2021
Restructuring and Related Activities [Abstract]
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 November 3, 2018 $ 2,108 $ 1,739 $ 3,847 Charges 13,779 (1) 10,759 (4) 24,538 Cash payments (11,904) (1,338) (13,242) Balance at November 2, 2019 3,983 11,160 15,143 Charges 7,282 (2) 15,370 (5) 22,652 Adjustments related to ASC 842 — (11,160) (6) (11,160) Cash payments (8,350) (15,370) (23,720) Balance at October 31, 2020 2,915 — 2,915 Charges 5,938 (3) 23,627 (7) 29,565 Cash payments (8,072) (23,627) (31,699) Balance at October 30, 2021 $ 781 $ — $ 781 Current restructuring liabilities $ 781 $ — $ 781 _________________________________ (1) During fiscal 2019, Ciena recorded a charge of $13.8 million of severance and other employee-related costs associated with a workforce reduction of approximately 283 employees. (2) During fiscal 2020, Ciena recorded a charge of $7.3 million of severance and other employee-related costs associated with a workforce reduction of approximately 149 employees. (3) During fiscal 2021, Ciena recorded a charge of $5.9 million of severance and other employee-related costs associated with a workforce reduction of approximately 133 employees. (4) Reflects unfavorable lease commitments in connection with a portion of facilities located in Alpharetta, Georgia, Spokane, Washington, Durham, North Carolina and Hanover, Maryland. (5) Primarily represents costs and imputed interest expense related to restructured facilities and the redesign of certain business processes. (6) Represents restructuring reserve liability recognized as a reduction to Operating ROU assets, net in relation to adoption of ASC 842. (7) Primarily represents the redesign of certain business processes associated with Ciena’s supply chain and distribution structure reorganization, and costs related to restructured facilities.

INTEREST AND OTHER INCOME (LO_2

INTEREST AND OTHER INCOME (LOSS), NET (Tables)	12 Months Ended
	Oct. 30, 2021
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 30, 2021 October 31, 2020 November 2, 2019 Interest income $ 2,051 $ 6,860 $ 14,410 Gain on non-hedge designated foreign currency forward contracts 11,172 5,551 3 Foreign currency exchange losses (14,622) (13,022) (9,800) Other (369) 1,575 (737) Interest and other income (loss), net $ (1,768) $ 964 $ 3,876

SHORT-TERM AND LONG-TERM INVE_2

SHORT-TERM AND LONG-TERM INVESTMENTS (Tables)	12 Months Ended
	Oct. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Short-term and long-term investments	As of the dates indicated, investments are comprised of the following (in thousands): October 30, 2021 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations: Included in short-term investments $ 181,488 $ 5 $ (10) $ 181,483 Included in long-term investments 70,225 — (187) 70,038 $ 251,713 $ 5 $ (197) $ 251,521 October 31, 2020 Amortized Cost Gross Unrealized Gross Unrealized Estimated Fair U.S. government obligations: Included in short-term investments $ 150,559 $ 109 $ (1) $ 150,667 Included in long-term investments 82,252 — (26) 82,226 $ 232,811 $ 109 $ (27) $ 232,893
Legal maturities of debt investments	The following table summarizes the legal maturities of debt investments at October 30, 2021 (in thousands): October 30, 2021 Amortized Cost Estimated Fair Less than one year $ 181,488 $ 181,483 Due in 1-2 years 70,225 70,038 $ 251,713 $ 251,521

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Oct. 30, 2021
Fair Value Disclosures [Abstract]
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 30, 2021 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 1,120,851 $ — $ — $ 1,120,851 Bond mutual fund 75,425 — — 75,425 Time deposits 30,036 — — 30,036 Deferred compensation plan assets 12,968 — — 12,968 U.S. government obligations — 251,521 — 251,521 Foreign currency forward contracts — 14,935 — 14,935 Total assets measured at fair value $ 1,239,280 $ 266,456 $ — $ 1,505,736 Liabilities: Foreign currency forward contracts $ — $ 716 $ — $ 716 Forward starting interest rate swaps — 15,928 — 15,928 Total liabilities measured at fair value $ — $ 16,644 $ — $ 16,644 October 31, 2020 Level 1 Level 2 Level 3 Total Assets: Money market funds $ 889,293 $ — $ — $ 889,293 Bond mutual fund 50,361 — — $ 50,361 Deferred compensation plan assets 8,213 — — 8,213 U.S. government obligations — 232,893 — 232,893 Foreign currency forward contracts — 82 — 82 Total assets measured at fair value $ 947,867 $ 232,975 $ — $ 1,180,842 Liabilities: Foreign currency forward contracts $ — $ 681 $ — $ 681 Forward starting interest rate swaps — 28,513 — 28,513 Total liabilities measured at fair value $ — $ 29,194 $ — $ 29,194
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 Sheet as follows (in thousands): October 30, 2021 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 1,226,312 $ — $ — $ 1,226,312 Short-term investments — 181,483 — 181,483 Prepaid expenses and other — 14,935 — 14,935 Long-term investments — 70,038 — 70,038 Other long-term assets 12,968 — — 12,968 Total assets measured at fair value $ 1,239,280 $ 266,456 $ — $ 1,505,736 Liabilities: Accrued liabilities and other short-term obligations $ — $ 716 $ — $ 716 Other long-term obligations — 15,928 — 15,928 Total liabilities measured at fair value $ — $ 16,644 $ — $ 16,644 October 31, 2020 Level 1 Level 2 Level 3 Total Assets: Cash equivalents $ 939,654 $ — $ — $ 939,654 Short-term investments — 150,667 — 150,667 Prepaid expenses and other — 82 — 82 Other long-term assets 8,213 82,226 — 90,439 Total assets measured at fair value $ 947,867 $ 232,975 $ — $ 1,180,842 Liabilities: Accrued liabilities and other short-term obligations $ — $ 681 $ — $ 681 Other long-term obligations — 28,513 — 28,513 Total liabilities measured at fair value $ — $ 29,194 $ — $ 29,194

ACCOUNTS RECEIVABLE (Tables)

ACCOUNTS RECEIVABLE (Tables)	12 Months Ended
	Oct. 30, 2021
Receivables [Abstract]
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 (Note 1) Provisions Net Deductions Ending Balance November 2, 2019 $ 17,378 $ — $ 6,740 $ 4,017 $ 20,101 October 31, 2020 (1) $ 20,101 $ — $ 8,855 $ 18,358 $ 10,598 October 30, 2021 $ 10,598 $ 2,206 $ 2,346 $ 4,238 $ 10,912

INVENTORIES (Tables)

INVENTORIES (Tables)	12 Months Ended
	Oct. 30, 2021
Inventory Disclosure [Abstract]
Inventories	As of the dates indicated, inventories are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Raw materials $ 175,399 $ 119,481 Work-in-process 10,260 13,738 Finished goods 180,800 210,050 Deferred cost of goods sold 44,765 40,747 411,224 384,016 Reserve for excess and obsolescence (36,959) (39,637) $ 374,265 $ 344,379
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 November 2, 2019 $ 50,938 $ 28,085 $ 31,701 $ 47,322 October 31, 2020 $ 47,322 $ 24,701 $ 32,386 $ 39,637 October 30, 2021 $ 39,637 $ 17,850 $ 20,528 $ 36,959

PREPAID EXPENSES AND OTHER (Tab

PREPAID EXPENSES AND OTHER (Tables)	12 Months Ended
	Oct. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses and other	As of the dates indicated, prepaid expenses and other are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Contract assets for unbilled accounts receivable, net $ 101,355 $ 85,843 Prepaid VAT and other taxes 77,388 72,838 Prepaid expenses 62,189 70,647 Product demonstration equipment, net 29,362 44,793 Capitalized contract acquisition costs 21,753 11,296 Other non-trade receivables 18,408 21,981 Derivative assets 14,935 82 Deferred deployment expense 264 604 $ 325,654 $ 308,084

EQUIPMENT, BUILDING, FURNITUR_2

EQUIPMENT, BUILDING, FURNITURE AND FIXTURES (Tables)	12 Months Ended
	Oct. 30, 2021
Property, Plant and Equipment [Abstract]
Equipment, building, furniture and fixtures	As of the dates indicated, equipment, building, furniture and fixtures are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Equipment, furniture and fixtures $ 599,672 $ 523,231 Building subject to finance lease 76,123 70,791 Leasehold improvements 100,270 89,407 776,065 683,429 Accumulated depreciation and amortization (491,097) (411,052) $ 284,968 $ 272,377

INTANGIBLE ASSETS (Tables)

INTANGIBLE ASSETS (Tables)	12 Months Ended
	Oct. 30, 2021
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets	As of the dates indicated, intangible assets are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Gross Accumulated Net Gross Accumulated Net Developed technology $ 395,726 $ (359,828) $ 35,898 $ 395,726 $ (335,512) $ 60,214 Patents and licenses 7,815 (3,321) 4,494 3,565 (2,529) 1,036 Customer relationships, covenants not to compete, outstanding purchase orders and contracts 375,329 (350,407) 24,922 374,659 (339,262) 35,397 Total intangible assets $ 778,870 $ (713,556) $ 65,314 $ 773,950 $ (677,303) $ 96,647
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 2022 $ 29,935 2023 15,125 2024 12,074 2025 6,865 2026 607 Thereafter 708 $ 65,314

GOODWILL (Tables)

GOODWILL (Tables)	12 Months Ended
	Oct. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill allocated by reportable segments	The following table presents the goodwill allocated to Ciena’s operating segments as of October 30, 2021 and October 31, 2020, as well as the changes to goodwill during fiscal 2021 (in thousands): Balance at October 31, 2020 Acquisitions Impairments Translation Balance at October 30, 2021 Platform Software and Services $ 156,191 $ — $ — $ — $ 156,191 Blue Planet Automation Software and Services 89,049 — — — 89,049 Networking Platforms 65,607 — — 798 66,405 Total $ 310,847 $ — $ — $ 798 $ 311,645

OTHER BALANCE SHEET DETAILS (Ta

OTHER BALANCE SHEET DETAILS (Tables)	12 Months Ended
	Oct. 30, 2021
Balance Sheet Related Disclosures [Abstract]
Other long-term assets	As of the dates indicated, other long-term assets are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Maintenance spares inventory, net $ 55,696 $ 62,077 Deferred compensation plan assets 12,968 8,213 Cost method equity investments 8,578 13,408 Capitalized contract acquisition costs 5,803 4,001 Deferred debt issuance costs, net (1) 1,188 1,596 Restricted cash 58 84 Other 15,600 13,451 $ 99,891 $ 102,830 (1) Deferred debt issuance costs relate to Ciena’s senior secured asset-based revolving credit facility (the “ABL Credit Facility”) entered into during fiscal 2019 and its predecessor credit facility (described in Note 20 below). The amortization of deferred debt issuance costs for the ABL Credit Facility and its predecessor is included in interest expense, and was $0.4 million for fiscal 2021 and fiscal 2020, and $0.3 million for fiscal 2019.
Accrued liabilities	As of the dates indicated, accrued liabilities and other short-term obligations are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Compensation, payroll related tax and benefits $ 201,119 $ 135,462 Warranty 48,019 49,868 Vacation 31,200 26,945 Income taxes payable 13,577 6,348 Finance lease liabilities 3,620 2,836 Interest payable 598 672 Other 111,152 112,001 $ 409,285 $ 334,132
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 November 2, 2019 $ 44,740 $ 23,105 $ 19,347 $ 48,498 October 31, 2020 $ 48,498 $ 22,417 $ 21,047 $ 49,868 October 30, 2021 $ 49,868 $ 17,093 $ 18,942 $ 48,019
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 30, 2021 Balance at October 31, 2020 Accounts receivable, net $ 884,958 $ 719,405 Contract assets for unbilled accounts receivable, net $ 101,355 $ 85,843 Deferred revenue $ 175,464 $ 158,363 As of the dates indicated, deferred revenue is comprised of the following (in thousands): October 30, 2021 October 31, 2020 Products $ 12,859 $ 17,534 Services 162,605 140,829 175,464 158,363 Less current portion (118,007) (108,700) Long-term deferred revenue $ 57,457 $ 49,663
Other liabilities	As of the dates indicated, other long-term obligations are comprised of the following (in thousands): October 30, 2021 October 31, 2020 Finance lease liabilities $ 62,583 $ 61,565 Interest rate swap liability 15,928 28,513 Income tax liability 63,412 16,386 Deferred compensation plan liability 12,877 8,172 Other 12,003 8,549 $ 166,803 $ 123,185

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)	12 Months Ended
	Oct. 30, 2021
Equity [Abstract]
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 Cumulative Available-for-Sale Securities Foreign Forward Starting Interest Rate Swaps Foreign Total Balance at November 3, 2018 $ (425) $ (3,060) $ 6,417 $ (8,712) $ (5,780) Other comprehensive gain (loss) before reclassifications 577 14 (18,948) (763) (19,120) Amounts reclassified from AOCI — 3,971 (1,155) — 2,816 Balance at November 2, 2019 152 925 (13,686) (9,475) (22,084) Other comprehensive loss before reclassifications (107) (3,891) (12,302) (4,174) (20,474) Amounts reclassified from AOCI — 2,747 4,453 — 7,200 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

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Oct. 30, 2021
Leases [Abstract]
Leases included in balance sheet	Leases included in the Consolidated Balance Sheets for the fiscal periods indicated were as follows (in thousands): Classification Balance as of October 30, 2021 Balance as of October 31, 2020 Operating leases: Operating ROU Assets Operating right-of-use assets $ 44,285 $ 57,026 Operating lease liabilities Operating lease liabilities and Long-term operating lease liabilities 60,196 80,450 Finance leases: Buildings, gross Equipment, building, furniture and fixtures, net $ 76,123 $ 70,791 Less: accumulated depreciation Equipment, building, furniture and fixtures, net (24,027) (17,837) Buildings, net $ 52,096 $ 52,954 Finance lease liabilities Accrued liabilities and other short-term obligations and other long-term obligations $ 66,203 $ 64,401
Components of lease expense	For the periods indicated, the components of lease expense included in the Consolidated Statement of Operations were as follows (in thousands): Year Ended Year Ended Classification October 30, 2021 October 31, 2020 Operating lease costs Operating expense $ 16,602 $ 17,544 Finance lease cost: Amortization of finance ROU asset Operating expense 4,773 4,465 Interest on finance lease liabilities Interest expense 4,882 4,777 Total finance lease cost 9,655 9,242 Non-capitalized lease cost Operating expense 1,152 2,976 Variable lease cost (1) Operating expense 5,690 5,185 Net lease cost (2) $ 33,099 $ 34,947 (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 $8.8 million and $11.0 million for the fiscal years ended October 30, 2021 and October 31, 2020, 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 30, 2021 As of October 31, 2020 Operating leases 4.06 4.87 Finance leases 10.71 11.71 Weighted-average discount rates: Operating leases 2.49 % 2.82 % Finance leases 7.56 % 7.56 %
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 30, 2021 were as follows (in thousands): Operating Leases Finance Leases Total 2022 $ 19,882 $ 8,338 $ 28,220 2023 15,153 8,557 23,710 2024 12,264 8,557 20,821 2025 7,935 8,730 16,665 2026 4,408 8,764 13,172 Thereafter 3,860 53,714 57,574 Total lease payments 63,502 96,660 160,162 Less: Imputed interest (3,306) (30,457) (33,763) Present value of lease liabilities 60,196 66,203 126,399 Less: Current portion of present value of minimum lease payments 18,632 3,620 22,252 Long-term portion of present value of minimum lease payments $ 41,564 $ 62,583 $ 104,147
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 30, 2021 were as follows (in thousands): Operating Leases Finance Leases Total 2022 $ 19,882 $ 8,338 $ 28,220 2023 15,153 8,557 23,710 2024 12,264 8,557 20,821 2025 7,935 8,730 16,665 2026 4,408 8,764 13,172 Thereafter 3,860 53,714 57,574 Total lease payments 63,502 96,660 160,162 Less: Imputed interest (3,306) (30,457) (33,763) Present value of lease liabilities 60,196 66,203 126,399 Less: Current portion of present value of minimum lease payments 18,632 3,620 22,252 Long-term portion of present value of minimum lease payments $ 41,564 $ 62,583 $ 104,147

SHORT-TERM AND LONG-TERM DEBT (

SHORT-TERM AND LONG-TERM DEBT (Tables)	12 Months Ended
	Oct. 30, 2021
Debt Disclosure [Abstract]
Schedule of carrying values and estimated fair values of debt instruments	The net carrying value of Ciena’s term loan was comprised of the following for the fiscal periods indicated (in thousands): October 30, 2021 October 31, 2020 Principal Balance Unamortized Discount Deferred Debt Issuance Costs Net Carrying Value Net Carrying Value 2025 Term Loan $ 680,873 $ (1,250) $ (2,338) $ 677,285 $ 683,286

EARNINGS PER SHARE CALCULATION

EARNINGS PER SHARE CALCULATION (Tables)	12 Months Ended
	Oct. 30, 2021
Earnings Per Share [Abstract]
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 30, 2021 October 31, 2020 November 2, 2019 Net income $ 500,196 $ 361,291 $ 253,434 Basic weighted average shares outstanding 155,279 154,287 155,720 Effect of dilutive potential common shares 1,464 1,668 1,892 Diluted weighted average shares 156,743 155,955 157,612 Basic EPS $ 3.22 $ 2.34 $ 1.63 Diluted EPS $ 3.19 $ 2.32 $ 1.61 Antidilutive employee share-based awards, excluded 110 263 234

STOCKHOLDERS_ EQUITY (Tables)

STOCKHOLDERS’ EQUITY (Tables)	12 Months Ended
	Oct. 30, 2021
Equity [Abstract]
Summary of stock repurchase program	The following table summarizes activity of the stock repurchase program, reported based on trade date: Shares Repurchased Weighted-Average Price per Share Amount Repurchased (in thousands) Cumulative balance at November 2, 2019 3,838,466 $ 39.10 $ 150,076 Repurchase of common stock under the stock repurchase program 1,872,446 $ 39.81 74,535 Cumulative balance at October 31, 2020 5,710,912 $ 39.33 $ 224,611 Repurchase of common stock under the stock repurchase program 1,696,949 $ 54.27 92,088 Cumulative balance at October 30, 2021 7,407,861 $ 42.75 $ 316,699

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Oct. 30, 2021
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	For the periods indicated, the provision (benefit) for income taxes consists of the following (in thousands): Year Ended October 30, 2021 October 31, 2020 November 2, 2019 Provision (benefit) for income taxes: Current: Federal $ 72,603 $ 4,363 $ 13,143 State 21,400 13,328 16,945 Foreign 25,021 12,640 9,816 Total current 119,024 30,331 39,904 Deferred: Federal (21,942) 60,679 31,872 State (11,546) 4,607 (9,159) Foreign (122,981) (947) (2,861) Total deferred (156,469) 64,339 19,852 Provision (benefit) for income taxes $ (37,445) $ 94,670 $ 59,756
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 30, 2021 October 31, 2020 November 2, 2019 United States $ 298,514 $ 387,697 $ 256,461 Foreign 164,237 68,264 56,729 Total $ 462,751 $ 455,961 $ 313,190
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 2021, fiscal 2020 and fiscal 2019 as follows: Year Ended October 30, 2021 October 31, 2020 November 2, 2019 Provision at statutory rate 21.00 % 21.00 % 21.00 % Intercompany IP Restructuring Transaction (25.85) % — % — % Base Erosion and Anti-Abuse Tax — % (1.02) % 3.60 % State taxes 3.73 % 2.21 % 2.18 % Foreign taxes 2.76 % 0.51 % (0.37) % Research and development credit (7.99) % (7.74) % (7.53) % Non-deductible compensation 1.68 % 1.79 % 1.01 % Foreign Derived Intangible Income (1.82) % (2.07) % — % Transition tax — % 0.02 % 0.29 % Rate Change (4.33) % 3.04 % (0.41) % Valuation allowance 1.77 % 3.58 % (2.13) % Other 0.96 % (0.56) % 1.44 % Effective income tax rate (8.09) % 20.76 % 19.08 %
Significant components of deferred tax assets and liabilities	The significant components of DTA are as follows (in thousands): Year Ended October 30, 2021 October 31, 2020 Deferred tax assets: Reserves and accrued liabilities $ 69,950 $ 73,825 Depreciation and amortization 677,729 504,233 NOL and credit carry forward 165,087 188,157 Other 47,048 33,017 Gross deferred tax assets 959,814 799,232 Valuation allowance (159,634) (151,427) Deferred tax asset, net of valuation allowance $ 800,180 $ 647,805
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 November 3, 2018 $ 96,363 Increase related to positions taken in current period 1,959 Reductions related to settlements with taxing authorities (1,224) Reductions related to expiration of statute of limitations (2,494) Unrecognized tax benefits at November 2, 2019 94,604 Increase related to positions taken in prior period 653 Increase related to positions taken in current period 1,151 Reductions related to expiration of statute of limitations (660) 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
Summary 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 November 2, 2019 $ 142,650 $ 27,459 $ 34,131 $ 135,978 October 31, 2020 $ 135,978 $ 25,749 $ 10,300 $ 151,427 October 30, 2021 $ 151,427 $ 17,897 $ 9,690 $ 159,634

SHARE-BASED COMPENSATION EXPE_2

SHARE-BASED COMPENSATION EXPENSE (Tables)	12 Months Ended
	Oct. 30, 2021
Share-based Payment Arrangement [Abstract]
Summary 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 as of October 31, 2020 107 $ 31.41 Granted — — Exercised (19) $ 30.13 Canceled (5) $ 18.22 Balance as of October 30, 2021 83 $ 32.46
Summarizes information with respect to stock options outstanding	The following table summarizes information with respect to stock options outstanding at October 30, 2021, based on Ciena’s closing stock price on the last trading day of Ciena’s fiscal 2021 (shares and intrinsic value in thousands): Options Outstanding and Vested at October 30, 2021 Number Weighted Weighted Range of of Contractual Average Aggregate Exercise Underlying Life Exercise Intrinsic Price Shares (Years) Price Value $ 11.34 — $ 18.22 33 1.61 $ 14.36 $ 1,334 $ 32.06 — $ 55.63 50 1.46 $ 44.69 487 $ 11.34 — $ 55.63 83 1.52 $ 32.46 $ 1,821
Assumptions for awards granted	Assumptions for awards granted during fiscal 2021, fiscal 2020 and fiscal 2019 included the following: Year Ended October 30, 2021 October 31, 2020 November 2, 2019 Expected volatility of Ciena common stock, which is a weighted average of implied volatility and historical volatility 41.00% 31.77% 34.10% Historical volatility of Ciena common stock 42.80% 36.29% 36.80% Historical volatility of S&P Networking Index 27.30% 18.40% 17.39% Correlation coefficient 0.6800 0.5891 0.6251 Expected life in years 2.87 2.87 2.87 Risk-free interest rate 0.17% 1.65% 2.62% Expected dividend yield 0.0% 0.0% 0.0%
Summary 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 as of October 31, 2020 4,049 $ 35.08 $ 159,498 Granted 2,350 Vested (2,079) Canceled or forfeited (236) Balance as of October 30, 2021 4,084 $ 43.67 $ 221,733
Share-based compensation expense	The following table summarizes share-based compensation expense for the periods indicated (in thousands): Year Ended October 30, 2021 October 31, 2020 November 2, 2019 Products $ 3,408 $ 3,182 $ 2,868 Services 5,181 3,853 3,175 Share-based compensation expense included in cost of goods sold 8,589 7,035 6,043 Research and development 21,863 16,987 14,321 Sales and marketing 25,152 20,194 16,474 General and administrative 28,804 23,424 22,841 Share-based compensation expense included in operating expense 75,819 60,605 53,636 Share-based compensation expense capitalized in inventory, net (72) 118 57 Total share-based compensation $ 84,336 $ 67,758 $ 59,736

SEGMENT AND ENTITY WIDE DISCL_2

SEGMENT AND ENTITY WIDE DISCLOSURES (Tables)	12 Months Ended
	Oct. 30, 2021
Segment Reporting [Abstract]
Reconciliation of assets from segment to consolidated	As of October 30, 2021, finite-lived intangible assets, goodwill and maintenance spares are assigned to asset groups within the following segments (in thousands): October 30, 2021 Networking Platforms Platform Software and Services Blue Planet Automation Software and Services Global Services Total Other intangible assets, net $ 8,336 $ — $ 56,978 $ — $ 65,314 Goodwill $ 66,405 $ 156,191 $ 89,049 $ — $ 311,645 Maintenance spares, net $ — $ — $ — $ 55,696 $ 55,696
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 30, 2021 October 31, 2020 November 2, 2019 Segment profit (loss): Networking Platforms $ 850,901 $ 827,105 $ 759,244 Platform Software and Services 136,602 105,609 64,210 Blue Planet Automation Software and Services (711) (12,446) (17,769) Global Services 198,521 202,735 188,242 Total segment profit 1,185,313 1,123,003 993,927 Less: non-performance operating expenses Selling and marketing 452,214 416,425 423,046 General and administrative 181,874 169,548 174,399 Significant asset impairments and restructuring costs 29,565 22,652 24,538 Amortization of intangible assets 23,732 23,383 21,808 Acquisition and integration costs 2,572 4,031 3,370 Add: other non-performance financial items Interest and other income (loss), net (1,768) 964 3,876 Interest expense (30,837) (31,321) (37,452) Loss on extinguishment and modification of debt — (646) — Less: Provision (benefit) for income taxes (37,445) 94,670 59,756 Consolidated net income $ 500,196 $ 361,291 $ 253,434
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 30, 2021 October 31, 2020 Canada $ 240,968 $ 214,188 United States 50,744 65,321 Other International 37,541 49,894 Total $ 329,253 $ 329,403

CIENA CORPORATION AND SIGNIFI_3

CIENA CORPORATION AND SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 04, 2018
Significant Accounting Policies [Line Items]
Cost method equity investments	$ 8,578	$ 13,408
Expected economic lives of finite-lived intangible assets (in years)	7 years
Expected number of years Spares usage cost is expensed	4 years
Cumulative amount of temporary differences for unremitted foreign earnings for which a deferred tax liability has not been recognized	$ 475,000
One-time employee termination benefits related to service period (in days)	60 days
Accumulated deficit	$ (3,785,132)	$ (4,283,122)
Effect of adoption of new accounting standard | Accounting Standards Update 2014-09
Significant Accounting Policies [Line Items]
Accumulated deficit			$ 49,800
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)	2 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. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,620,684	$ 3,532,157	$ 3,572,131
Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	2,948,208	2,918,108	3,003,347
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	672,476	614,049	568,784
Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	2,553,509	2,547,647	2,562,841
Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	271,796	267,416	348,477
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	229,588	197,809	155,376
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	77,247	62,632	54,555
Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	283,350	269,354	261,337
Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	171,489	152,003	148,233
Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	33,705	35,296	41,312
Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	2,825,305	2,815,063	2,911,318
Networking Platforms | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	2,825,305	2,815,063	2,911,318
Networking Platforms | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Networking Platforms | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	2,553,509	2,547,647	2,562,841
Networking Platforms | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	271,796	267,416	348,477
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	229,588	197,809	155,376
Platform Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	80,359	69,099	55,530
Platform Software and Services | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	149,229	128,710	99,846
Platform Software and Services | Converged Packet Optical
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	229,588	197,809	155,376
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	77,247	62,632	54,555
Blue Planet Automation Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	27,621	19,583	17,697
Blue Planet Automation Software and Services | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	49,626	43,049	36,858
Blue Planet Automation Software and Services | Converged Packet Optical
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	77,247	62,632	54,555
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	488,544	456,653	450,882
Global Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	14,923	14,363	18,802
Global Services | Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	473,621	442,290	432,080
Global Services | Converged Packet Optical
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	283,350	269,354	261,337
Global Services | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	171,489	152,003	148,233
Global Services | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	$ 33,705	$ 35,296	$ 41,312

REVENUE - Geographical Distribu

REVENUE - Geographical Distribution of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,620,684	$ 3,532,157	$ 3,572,131
Americas
Disaggregation of Revenue [Line Items]
Total revenue	2,525,619	2,469,278	2,503,913
EMEA
Disaggregation of Revenue [Line Items]
Total revenue	670,462	591,468	566,718
APAC
Disaggregation of Revenue [Line Items]
Total revenue	424,603	471,411	$ 501,500
United States
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,270,000	$ 2,250,000

REVENUE - Revenue by Major Cust

REVENUE - Revenue by Major Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Revenue, Major Customer [Line Items]
Total revenue	$ 3,620,684	$ 3,532,157	$ 3,572,131
AT&T | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue	447,403	373,163	388,704
Verizon | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue			459,787
Web-scale provider | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue			370,577
Total | Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Total revenue	$ 447,403	$ 373,163	$ 1,219,068

REVENUE - Contract Balances (De

REVENUE - Contract Balances (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 884,958	$ 719,405
Contract assets for unbilled accounts receivable, net	101,355	85,843
Deferred revenue	$ 175,464	$ 158,363

REVENUE - Narrative (Details)

REVENUE - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Revenue from External Customer [Line Items]
Revenue recognized that was previously deferred	$ 106.5	$ 101.9
Capitalized contract acquisition costs	27.6	15.3
Amortization of capitalized contract acquisition costs	24.6	$ 22.4
Remaining performance obligation	$ 1,600
Revenue | Customer Concentration Risk | Ten Largest Customers
Revenue from External Customer [Line Items]
Concentration risk, percentage	55.50%	54.50%	59.30%

REVENUE - Performance Obligatio

REVENUE - Performance Obligation (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-31	Oct. 30, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of remaining performance obligation	85.00%
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, 2021CAD ($)	Oct. 30, 2021USD ($)	Oct. 31, 2020CAD ($)	Oct. 31, 2020USD ($)	Oct. 30, 2021USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Amounts receivable from grant	$ 6.1				$ 4,900
Canadian Emergency Wage Subsidy
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit	$ 52.2	$ 41,280		$ 0
Grants, Canada Emergency Wage Subsidy, 2020 Employee Wages
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit			$ 43.9	$ 35,400
Amounts receivable from grant					$ 0

CANADIAN EMERGENCY WAGE SUBSI_4

CANADIAN EMERGENCY WAGE SUBSIDY - Schedule of Canadian Emergency Wage Subsidy (Details) - Canadian Emergency Wage Subsidy $ in Thousands, $ in Millions	12 Months Ended
	Oct. 30, 2021CAD ($)	Oct. 30, 2021USD ($)	Oct. 31, 2020USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit	$ 52.2	$ 41,280	$ 0
Product
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		4,283	0
Service
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		2,667	0
CEWS benefit in cost of goods sold
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		6,950	0
Research and development
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		29,519	0
Sales and marketing
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		2,604	0
General and administrative
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		2,207	0
CEWS benefit in operating expense
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit		$ 34,330	$ 0

BUSINESS COMBINATIONS - Narrati

BUSINESS COMBINATIONS - Narrative (Details) - Centina Systems, Inc. $ in Millions	Nov. 02, 2019USD ($)
Business Acquisition [Line Items]
Payment to acquire business	$ 34
Customer relationships and contracts
Business Acquisition [Line Items]
Intangible assets, useful life	2 years
Developed technology
Business Acquisition [Line Items]
Intangible assets, useful life	5 years

BUSINESS COMBINATIONS - Purchas

BUSINESS COMBINATIONS - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Business Acquisition [Line Items]
Goodwill	$ 311,645	$ 310,847
Centina Systems, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents			$ 5,718
Accounts receivable			610
Prepaid expenses and other			536
Equipment, furniture and fixtures			17
Goodwill			13,055
Accounts payable			(47)
Accrued liabilities			(286)
Deferred revenue			(1,493)
Deferred tax liability			(6,692)
Total purchase consideration			34,018
Centina Systems, Inc. | Customer relationships and contracts
Business Acquisition [Line Items]
Intangible assets acquired			400
Centina Systems, Inc. | Developed technology
Business Acquisition [Line Items]
Intangible assets acquired			$ 22,200

RESTRUCTURING COSTS (Details)

RESTRUCTURING COSTS (Details) $ in Thousands	12 Months Ended
	Oct. 30, 2021USD ($)employee	Oct. 31, 2020USD ($)employee	Nov. 02, 2019USD ($)employee
Activity and balance of the restructuring liability accounts
Balance at beginning of period	$ 2,915	$ 15,143	$ 3,847
Charges	29,565	22,652	24,538
Cash payments	(31,699)	(23,720)	(13,242)
Balance at end of period	781	2,915	15,143
Current restructuring liabilities	781
Effect of adoption of new accounting standard
Activity and balance of the restructuring liability accounts
Balance at beginning of period		(11,160)
Balance at end of period			(11,160)
Workforce reduction
Activity and balance of the restructuring liability accounts
Balance at beginning of period	2,915	3,983	2,108
Charges	5,938	7,282	13,779
Cash payments	(8,072)	(8,350)	(11,904)
Balance at end of period	781	$ 2,915	$ 3,983
Current restructuring liabilities	$ 781
Restructuring and Related Cost, Positions Eliminated [Abstract]
Number of employees in workforce reduction | employee	133	149	283
Workforce reduction | Effect of adoption of new accounting standard
Activity and balance of the restructuring liability accounts
Balance at beginning of period		$ 0
Balance at end of period			$ 0
Other restructuring activities
Activity and balance of the restructuring liability accounts
Balance at beginning of period	$ 0	11,160	1,739
Charges	23,627	15,370	10,759
Cash payments	(23,627)	(15,370)	(1,338)
Balance at end of period	0	0	11,160
Current restructuring liabilities	$ 0
Other restructuring activities | Effect of adoption of new accounting standard
Activity and balance of the restructuring liability accounts
Balance at beginning of period		$ (11,160)
Balance at end of period			$ (11,160)

INTEREST AND OTHER INCOME (LO_3

INTEREST AND OTHER INCOME (LOSS), NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Other Income and Expenses [Abstract]
Interest income	$ 2,051	$ 6,860	$ 14,410
Gain on non-hedge designated foreign currency forward contracts	11,172	5,551	3
Foreign currency exchange losses	(14,622)	(13,022)	(9,800)
Other	(369)	1,575	(737)
Interest and other income (loss), net	$ (1,768)	$ 964	$ 3,876

SHORT-TERM AND LONG-TERM INVE_3

SHORT-TERM AND LONG-TERM INVESTMENTS - Schedule of Short-term and Long-term Investments (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 251,713
Estimated Fair Value	251,521
U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	251,713	$ 232,811
Gross Unrealized Gains	5	109
Gross Unrealized Losses	(197)	(27)
Estimated Fair Value	251,521	232,893
Short-term Investments | U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	181,488	150,559
Gross Unrealized Gains	5	109
Gross Unrealized Losses	(10)	(1)
Estimated Fair Value	181,483	150,667
Other Long-term Investments | U.S. government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	70,225	82,252
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(187)	(26)
Estimated Fair Value	$ 70,038	$ 82,226

SHORT-TERM AND LONG-TERM INVE_4

SHORT-TERM AND LONG-TERM INVESTMENTS - Legal Maturities of Debt Investments (Details) $ in Thousands	Oct. 30, 2021USD ($)
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Less than one year	$ 181,488
Amortized Cost, Due in 1-2 years	70,225
Amortized Cost	251,713
Estimated Fair Value, Less than one year	181,483
Estimated Fair Value, Due in 1-2 years	70,038
Estimated Fair Value	$ 251,521

FAIR VALUE MEASUREMENTS - Sched

FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020
Assets:
Debt securities	$ 251,521
Fair Value, Measurements, Recurring
Assets:
Deferred compensation plan assets	12,968	$ 8,213
Total assets measured at fair value	1,505,736	1,180,842
Liabilities:
Total liabilities measured at fair value	16,644	29,194
Fair Value, Measurements, Recurring | Money market funds
Assets:
Cash equivalents	1,120,851	889,293
Fair Value, Measurements, Recurring | Time deposits
Assets:
Cash equivalents	30,036
Fair Value, Measurements, Recurring | Bond mutual fund
Assets:
Debt securities	75,425	50,361
Fair Value, Measurements, Recurring | U.S. government obligations
Assets:
Debt securities	251,521	232,893
Level 1 | Fair Value, Measurements, Recurring
Assets:
Deferred compensation plan assets	12,968	8,213
Total assets measured at fair value	1,239,280	947,867
Liabilities:
Total liabilities measured at fair value	0	0
Level 1 | Fair Value, Measurements, Recurring | Money market funds
Assets:
Cash equivalents	1,120,851	889,293
Level 1 | Fair Value, Measurements, Recurring | Time deposits
Assets:
Cash equivalents	30,036
Level 1 | Fair Value, Measurements, Recurring | Bond mutual fund
Assets:
Debt securities	75,425	50,361
Level 1 | Fair Value, Measurements, Recurring | U.S. government obligations
Assets:
Debt securities	0	0
Level 2 | Fair Value, Measurements, Recurring
Assets:
Deferred compensation plan assets	0	0
Total assets measured at fair value	266,456	232,975
Liabilities:
Total liabilities measured at fair value	16,644	29,194
Level 2 | Fair Value, Measurements, Recurring | Money market funds
Assets:
Cash equivalents	0	0
Level 2 | Fair Value, Measurements, Recurring | Time deposits
Assets:
Cash equivalents	0
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	251,521	232,893
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 | Money market funds
Assets:
Cash equivalents	0	0
Level 3 | Fair Value, Measurements, Recurring | Time deposits
Assets:
Cash equivalents	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
Foreign Currency Forward Contracts | Fair Value, Measurements, Recurring
Assets:
Foreign currency forward contracts	14,935	82
Liabilities:
Derivative liability	716	681
Foreign Currency Forward Contracts | Level 1 | Fair Value, Measurements, Recurring
Assets:
Foreign currency forward contracts	0	0
Liabilities:
Derivative liability	0	0
Foreign Currency Forward Contracts | Level 2 | Fair Value, Measurements, Recurring
Assets:
Foreign currency forward contracts	14,935	82
Liabilities:
Derivative liability	716	681
Foreign Currency Forward Contracts | Level 3 | Fair Value, Measurements, Recurring
Assets:
Foreign currency forward contracts	0	0
Liabilities:
Derivative liability	0	0
Forward starting interest rate swaps | Fair Value, Measurements, Recurring
Liabilities:
Derivative liability	15,928	28,513
Forward starting interest rate swaps | Level 1 | Fair Value, Measurements, Recurring
Liabilities:
Derivative liability	0	0
Forward starting interest rate swaps | Level 2 | Fair Value, Measurements, Recurring
Liabilities:
Derivative liability	15,928	28,513
Forward starting interest rate swaps | Level 3 | Fair Value, Measurements, Recurring
Liabilities:
Derivative liability	$ 0	$ 0

FAIR VALUE MEASUREMENTS - Balan

FAIR VALUE MEASUREMENTS - Balance Sheet Items (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020
Assets:
Total assets measured at fair value	$ 1,505,736	$ 1,180,842
Liabilities:
Total liabilities measured at fair value	16,644	29,194
Cash equivalents
Assets:
Cash equivalents	1,226,312	939,654
Short-term investments
Assets:
Short-term investments	181,483	150,667
Prepaid expenses and other
Assets:
Other assets	14,935	82
Long-term investments
Assets:
Long-term investments	70,038
Other long-term assets
Assets:
Other assets	12,968	90,439
Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations	716	681
Other long-term obligations
Liabilities:
Other long-term obligations	15,928	28,513
Level 1
Assets:
Total assets measured at fair value	1,239,280	947,867
Liabilities:
Total liabilities measured at fair value	0	0
Level 1 | Cash equivalents
Assets:
Cash equivalents	1,226,312	939,654
Level 1 | Short-term investments
Assets:
Short-term investments	0	0
Level 1 | Prepaid expenses and other
Assets:
Other assets	0	0
Level 1 | Long-term investments
Assets:
Long-term investments	0
Level 1 | Other long-term assets
Assets:
Other assets	12,968	8,213
Level 1 | Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations	0	0
Level 1 | Other long-term obligations
Liabilities:
Other long-term obligations	0	0
Level 2
Assets:
Total assets measured at fair value	266,456	232,975
Liabilities:
Total liabilities measured at fair value	16,644	29,194
Level 2 | Cash equivalents
Assets:
Cash equivalents	0	0
Level 2 | Short-term investments
Assets:
Short-term investments	181,483	150,667
Level 2 | Prepaid expenses and other
Assets:
Other assets	14,935	82
Level 2 | Long-term investments
Assets:
Long-term investments	70,038
Level 2 | Other long-term assets
Assets:
Other assets	0	82,226
Level 2 | Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations	716	681
Level 2 | Other long-term obligations
Liabilities:
Other long-term obligations	15,928	28,513
Level 3
Assets:
Total assets measured at fair value	0	0
Liabilities:
Total liabilities measured at fair value	0	0
Level 3 | Cash equivalents
Assets:
Cash equivalents	0	0
Level 3 | Short-term investments
Assets:
Short-term investments	0	0
Level 3 | Prepaid expenses and other
Assets:
Other assets	0	0
Level 3 | Long-term investments
Assets:
Long-term investments	0
Level 3 | Other long-term assets
Assets:
Other assets	0	0
Level 3 | Accrued liabilities and other short-term obligations
Liabilities:
Accrued liabilities and other short-term obligations	0	0
Level 3 | Other long-term obligations
Liabilities:
Other long-term obligations	$ 0	$ 0

ACCOUNTS RECEIVABLE (Details)

ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 10,598	$ 20,101	$ 17,378
Provisions	2,346	8,855	6,740
Net Deductions	4,238	18,358	4,017
Balance at end of period	10,912	10,598	$ 20,101
Effect of adoption of new accounting standard
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 2,206
Balance at end of period		$ 2,206
Unidentified Customer One | Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%	10.00%
Unidentified Customer Two | Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%
Customer in APAC Region
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Net Deductions		$ 12,200

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Inventories
Raw materials	$ 175,399	$ 119,481
Work-in-process	10,260	13,738
Finished goods	180,800	210,050
Deferred cost of goods sold	44,765	40,747
Inventories before provision	411,224	384,016
Reserve for excess and obsolescence	(36,959)	(39,637)	$ (47,322)
Total inventories	374,265	344,379
Reserve for excess and obsolete inventory [Roll Forward]
Valuation allowance, beginning balance	39,637	47,322	50,938
Provisions	17,850	24,701	28,085
Disposals	20,528	32,386	31,701
Valuation allowance, ending balance	$ 36,959	$ 39,637	$ 47,322

PREPAID EXPENSES AND OTHER (Det

PREPAID EXPENSES AND OTHER (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Capitalized Contract Cost [Line Items]
Prepaid VAT and other taxes	$ 77,388	$ 72,838
Prepaid expenses	62,189	70,647
Product demonstration equipment, net	29,362	44,793
Other non-trade receivables	18,408	21,981
Derivative assets	14,935	82
Deferred deployment expense	264	604
Prepaid expenses and other	325,654	308,084
Depreciation of product demonstration equipment	9,800	9,000	$ 8,800
Contract assets for unbilled accounts receivable, net
Capitalized Contract Cost [Line Items]
Contract assets	101,355	85,843
Capitalized contract acquisition costs
Capitalized Contract Cost [Line Items]
Contract assets	$ 21,753	$ 11,296

EQUIPMENT, BUILDING, FURNITUR_3

EQUIPMENT, BUILDING, FURNITURE AND FIXTURES (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Property, Plant and Equipment, Net [Abstract]
Equipment, building, furniture and fixtures, gross	$ 776,065	$ 683,429
Accumulated depreciation and amortization	(491,097)	(411,052)
Equipment, building, furniture and fixtures, net	284,968	272,377
Equipment, furniture and fixtures
Property, Plant and Equipment, Net [Abstract]
Equipment, building, furniture and fixtures, gross	599,672	523,231
Building subject to finance lease
Property, Plant and Equipment, Net [Abstract]
Equipment, building, furniture and fixtures, gross	76,123	70,791
Leasehold improvements
Property, Plant and Equipment, Net [Abstract]
Equipment, building, furniture and fixtures, gross	100,270	89,407
Equipment, Building, and Furniture and Fixtures
Property, Plant and Equipment, Net [Abstract]
Depreciation of equipment, furniture and fixtures, and amortization of leasehold improvements	$ 86,500	$ 84,900	$ 78,800

INTANGIBLE ASSETS (Details)

INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Intangible Assets
Gross Intangible	$ 778,870	$ 773,950
Accumulated Amortization	(713,556)	(677,303)
Net Intangible	65,314	96,647
Amortization of intangible assets	36,033	38,619	$ 35,136
Expected future amortization of finite-lived intangible assets
2022	29,935
2023	15,125
2024	12,074
2025	6,865
2026	607
Thereafter	708
Net Intangible	65,314	96,647
Developed technology
Intangible Assets
Gross Intangible	395,726	395,726
Accumulated Amortization	(359,828)	(335,512)
Net Intangible	35,898	60,214
Expected future amortization of finite-lived intangible assets
Net Intangible	35,898	60,214
Patents and licenses
Intangible Assets
Gross Intangible	7,815	3,565
Accumulated Amortization	(3,321)	(2,529)
Net Intangible	4,494	1,036
Expected future amortization of finite-lived intangible assets
Net Intangible	4,494	1,036
Customer relationships, covenants not to compete, outstanding purchase orders and contracts
Intangible Assets
Gross Intangible	375,329	374,659
Accumulated Amortization	(350,407)	(339,262)
Net Intangible	24,922	35,397
Expected future amortization of finite-lived intangible assets
Net Intangible	$ 24,922	$ 35,397

GOODWILL (Details)

GOODWILL (Details) $ in Thousands	12 Months Ended
	Oct. 30, 2021USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 310,847
Acquisitions	0
Impairments	0
Translation	798
Goodwill, ending balance	311,645
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	66,405
Operating Segments | Platform Software and Services
Goodwill [Roll Forward]
Goodwill, beginning balance	156,191
Acquisitions	0
Impairments	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
Impairments	0
Translation	0
Goodwill, ending balance	89,049
Operating Segments | Networking Platforms
Goodwill [Roll Forward]
Goodwill, beginning balance	65,607
Acquisitions	0
Impairments	0
Translation	798
Goodwill, ending balance	$ 66,405

OTHER BALANCE SHEET DETAILS - O

OTHER BALANCE SHEET DETAILS - Other Long Term Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Other long-term assets
Maintenance spares inventory, net	$ 55,696	$ 62,077
Deferred compensation plan assets	12,968	8,213
Cost method equity investments	8,578	13,408
Capitalized contract acquisition costs	5,803	4,001
Deferred debt issuance costs, net	1,188	1,596
Restricted cash	58	84
Other	15,600	13,451
Total	99,891	102,830
Revolving Credit Facility
Other long-term assets
Amortization of debt issuance costs included in interest expense	$ 400	$ 400	$ 300

OTHER BALANCE SHEET DETAILS - A

OTHER BALANCE SHEET DETAILS - Accrued Liabilities (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019	Nov. 03, 2018
Accrued liabilities
Compensation, payroll related tax and benefits	$ 201,119	$ 135,462
Warranty	48,019	49,868	$ 48,498	$ 44,740
Vacation	31,200	26,945
Income taxes payable	$ 13,577	$ 6,348
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total	Total
Finance lease liabilities	$ 3,620	$ 2,836
Interest payable	598	672
Other	111,152	112,001
Total	$ 409,285	$ 334,132

OTHER BALANCE SHEET DETAILS -_2

OTHER BALANCE SHEET DETAILS - Accrued Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning Balance	$ 49,868	$ 48,498	$ 44,740
Current Year Provisions	17,093	22,417	23,105
Settlements	18,942	21,047	19,347
Ending Balance	$ 48,019	$ 49,868	$ 48,498

OTHER BALANCE SHEET DETAILS - D

OTHER BALANCE SHEET DETAILS - Deferred Revenue (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020
Disaggregation of Revenue [Line Items]
Total	$ 175,464	$ 158,363
Less current portion	(118,007)	(108,700)
Long-term deferred revenue	57,457	49,663
Products
Disaggregation of Revenue [Line Items]
Total	12,859	17,534
Services
Disaggregation of Revenue [Line Items]
Total	$ 162,605	$ 140,829

OTHER BALANCE SHEET DETAILS -_3

OTHER BALANCE SHEET DETAILS - Other Long-Term Obligations (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020
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	$ 62,583	$ 61,565
Interest rate swap liability	15,928	28,513
Income tax liability	63,412	16,386
Deferred compensation plan liability	12,877	8,172
Other	12,003	8,549
Other long-term obligations	$ 166,803	$ 123,185

DERIVATIVE INSTRUMENTS (Details

DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020
Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract maturities	24 months
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 288.6	$ 254.9
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Cash Flow Hedging | Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract maturities	24 months
Designated as Hedging Instrument | Forward starting interest rate swaps | Cash Flow Hedging | Term Loan 2025 | Secured Debt
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 350
Fixed interest amount resulting from interest rate swap	2.957%
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 296.1	$ 212
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract maturities	12 months

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 2,509,597	$ 2,172,761	$ 1,929,334
Other comprehensive gain (loss) before reclassifications	36,601	(20,474)	(19,120)
Amounts reclassified from AOCI	(804)	7,200	2,816
Ending balance	3,020,018	2,509,597	2,172,761
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(35,358)	(22,084)	(5,780)
Ending balance	439	(35,358)	(22,084)
Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	45	152	(425)
Other comprehensive gain (loss) before reclassifications	(209)	(107)	577
Amounts reclassified from AOCI	0	0	0
Ending balance	(164)	45	152
Unrealized Gain/Losses on Derivative Instruments | Foreign Currency Forward Contracts
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(219)	925	(3,060)
Other comprehensive gain (loss) before reclassifications	16,856	(3,891)	14
Amounts reclassified from AOCI	(10,421)	2,747	3,971
Ending balance	6,216	(219)	925
Unrealized Gain/Losses on Derivative Instruments | Forward starting interest rate swaps
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(21,535)	(13,686)	6,417
Other comprehensive gain (loss) before reclassifications	(261)	(12,302)	(18,948)
Amounts reclassified from AOCI	9,617	4,453	(1,155)
Ending balance	(12,179)	(21,535)	(13,686)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(13,649)	(9,475)	(8,712)
Other comprehensive gain (loss) before reclassifications	20,215	(4,174)	(763)
Amounts reclassified from AOCI	0	0	0
Ending balance	$ 6,566	$ (13,649)	$ (9,475)

LEASES - Narrative (Details)

LEASES - Narrative (Details) ft² in Millions, $ in Millions	12 Months Ended
	Oct. 30, 2021USD ($)ft²
Leases [Abstract]
Area leased (in sq ft) | ft²	1.3
Remaining lease term (up to)	11 years
Extension term (up to)	10 years
Termination period (up to)	5 years
ROU assets that involve subleased or vacant space | $	$ 3.5

LEASES - Leases Included in the

LEASES - Leases Included in the Balance Sheet (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020
Operating leases:
Operating ROU Assets	$ 44,285	$ 57,026
Operating lease liabilities	60,196	80,450
Finance leases:
Buildings, gross	$ 76,123	$ 70,791
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	$ (24,027)	$ (17,837)
Buildings, net	52,096	52,954
Finance lease liabilities	66,203
Accrued liabilities and other short-term obligations
Finance leases:
Finance lease liabilities	66,203	64,401
Other long-term obligations
Finance leases:
Finance lease liabilities	$ 66,203	$ 64,401

LEASES - Lease Cost (Details)

LEASES - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020
Leases [Abstract]
Operating lease costs	$ 16,602	$ 17,544
Finance lease cost:
Amortization of finance ROU asset	4,773	4,465
Interest on finance lease liabilities	4,882	4,777
Total finance lease cost	9,655	9,242
Non-capitalized lease cost	1,152	2,976
Variable lease cost	5,690	5,185
Net lease cost	33,099	34,947
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Amortization	$ 8,800	$ 11,000

LEASES - Leases Maturity (Detai

LEASES - Leases Maturity (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020
Operating Leases
2022	$ 19,882
2023	15,153
2024	12,264
2025	7,935
2026	4,408
Thereafter	3,860
Total lease payments	63,502
Less: Imputed interest	(3,306)
Present value of lease liabilities	60,196	$ 80,450
Less: Current portion of present value of minimum lease payments	(18,632)	(19,035)
Long-term portion of present value of minimum lease payments	41,564	61,415
Finance Leases
2022	8,338
2023	8,557
2024	8,557
2025	8,730
2026	8,764
Thereafter	53,714
Total lease payments	96,660
Less: Imputed interest	(30,457)
Present value of lease liabilities	66,203
Less: Current portion of present value of minimum lease payments	(3,620)	(2,836)
Long-term portion of present value of minimum lease payments	62,583	$ 61,565
Total
2022	28,220
2023	23,710
2024	20,821
2025	16,665
2026	13,172
Thereafter	57,574
Total lease payments	160,162
Less: Imputed interest	(33,763)
Present value of lease liabilities	126,399
Less: Current portion of present value of minimum lease payments	22,252
Long-term portion of present value of minimum lease payments	$ 104,147

LEASES - Weighted Average Remai

LEASES - Weighted Average Remaining Lease Terms and Discount Rates (Details)	Oct. 30, 2021	Oct. 31, 2020
Weighted-average remaining lease term in years:
Operating leases	4 years 21 days	4 years 10 months 13 days
Finance leases	10 years 8 months 15 days	11 years 8 months 15 days
Weighted-average discount rates:
Operating leases	2.49%	2.82%
Finance leases	7.56%	7.56%

SHORT-TERM AND LONG-TERM DEBT -

SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - Secured Debt - 2025 Term Loan - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Jan. 23, 2020
Debt Instrument [Line Items]
Principal Balance	$ 680,873		$ 693,000
Deferred debt issuance costs	2,338	$ 2,900
Amortization of debt issuance costs included in interest expense	600	$ 600
Fair value of debt	$ 680,000

SHORT-TERM AND LONG-TERM DEBT_2

SHORT-TERM AND LONG-TERM DEBT - Net Carrying Values of Term Loans (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020	Jan. 23, 2020
Debt Instrument [Line Items]
Net Carrying Value		$ 683,286
Secured Debt | 2025 Term Loan
Debt Instrument [Line Items]
Principal Balance	$ 680,873		$ 693,000
Unamortized Discount	(1,250)
Deferred Debt Issuance Costs	(2,338)	$ (2,900)
Net Carrying Value	$ 677,285

ABL CREDIT FACILITY (Details)

ABL CREDIT FACILITY (Details) $ in Millions	Oct. 30, 2021USD ($)
Letter of Credit
Line of Credit Facility [Line Items]
Letters of credit collateralized by the credit facility	$ 87.4
Revolving Credit Facility
Line of Credit Facility [Line Items]
Current borrowing capacity	300
Line of credit outstanding	$ 0

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. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Earnings Per Share [Abstract]
Net income	$ 500,196	$ 361,291	$ 253,434
Basic weighted average shares outstanding (in shares)	155,279	154,287	155,720
Effect of dilutive potential common shares (in shares)	1,464	1,668	1,892
Diluted weighted average shares (in shares)	156,743	155,955	157,612
Basic EPS (in dollars per share)	$ 3.22	$ 2.34	$ 1.63
Diluted EPS (in dollars per share)	$ 3.19	$ 2.32	$ 1.61
Antidilutive employee share-based awards, excluded (in shares)	110	263	234

STOCKHOLDERS_ EQUITY - Narrativ

STOCKHOLDERS’ EQUITY - Narrative (Details) - USD ($)	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019	Dec. 13, 2018
Equity [Abstract]
Stock repurchase program authorized amount				$ 500,000,000
Shares repurchased for tax withholdings on vesting of restricted stock units	$ 44,071,000	$ 32,472,000	$ 29,059,000

STOCKHOLDERS_ EQUITY - Summary

STOCKHOLDERS’ EQUITY - Summary of Stock Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020
Shares Repurchased
Beginning balance (in shares)	5,710,912,000	3,838,466,000
Repurchase of common stock under the stock repurchase program (in shares)	1,696,949,000	1,872,446,000
Ending balance (in shares)	7,407,861,000	5,710,912,000
Weighted-Average Price per Share
Beginning balance (in dollars per share)	$ 39.33	$ 39.10
Repurchase of common stock under the stock repurchase program (in dollars per share)	54.27	39.81
Ending balance (in dollars per share)	$ 42.75	$ 39.33
Amount Repurchased (in thousands)
Beginning balance	$ 224,611	$ 150,076
Repurchase of common stock under the stock repurchase program	92,088	74,535
Ending balance	$ 316,699	$ 224,611

INCOME TAXES - Provision (Benef

INCOME TAXES - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Current:
Federal	$ 72,603	$ 4,363	$ 13,143
State	21,400	13,328	16,945
Foreign	25,021	12,640	9,816
Total current	119,024	30,331	39,904
Deferred:
Federal	(21,942)	60,679	31,872
State	(11,546)	4,607	(9,159)
Foreign	(122,981)	(947)	(2,861)
Total deferred	(156,469)	64,339	19,852
Provision (benefit) for income taxes	$ (37,445)	$ 94,670	$ 59,756

INCOME TAXES - Income Before Pr

INCOME TAXES - Income Before Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Income (loss) before provision (benefit) for income taxes:
United States	$ 298,514	$ 387,697	$ 256,461
Foreign	164,237	68,264	56,729
Income before income taxes	$ 462,751	$ 455,961	$ 313,190

INCOME TAXES - Effective Income

INCOME TAXES - Effective Income Tax Rate (Details)	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Income tax rate reconciliation:
Provision at statutory rate	21.00%	21.00%	21.00%
Intercompany IP Restructuring Transaction	(25.85%)	0.00%	0.00%
Base Erosion and Anti-Abuse Tax	0.00%	(1.02%)	3.60%
State taxes	3.73%	2.21%	2.18%
Foreign taxes	2.76%	0.51%	(0.37%)
Research and development credit	(7.99%)	(7.74%)	(7.53%)
Non-deductible compensation	1.68%	1.79%	1.01%
Foreign Derived Intangible Income	(1.82%)	(2.07%)	0.00%
Transition tax	0.00%	0.02%	0.29%
Rate Change	(4.33%)	3.04%	(0.41%)
Valuation allowance	1.77%	3.58%	(2.13%)
Other	0.96%	(0.56%)	1.44%
Effective income tax rate	(8.09%)	20.76%	19.08%

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019	Nov. 03, 2018
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	3,800	$ 3,900
Interest and penalties expense (benefit)	100	900	$ 1,000
Cumulative unremitted earnings of non-U.S. affiliates	475,000
Cumulative amount of temporary differences for unremitted foreign earnings for which a deferred tax liability has not been recognized	32,000
Valuation allowance	$ 159,634	$ 151,427	$ 135,978	$ 142,650

INCOME TAXES - Components of De

INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019	Nov. 03, 2018
Deferred tax assets:
Reserves and accrued liabilities	$ 69,950	$ 73,825
Depreciation and amortization	677,729	504,233
NOL and credit carry forward	165,087	188,157
Other	47,048	33,017
Gross deferred tax assets	959,814	799,232
Valuation allowance	(159,634)	(151,427)	$ (135,978)	$ (142,650)
Deferred tax asset, net of valuation allowance	$ 800,180	$ 647,805

INCOME TAXES - Reconciliation o

INCOME TAXES - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest and penalties
Unrecognized tax benefits, beginning balance	$ 95,748	$ 94,604	$ 96,363
Increase related to positions taken in prior period		653
Decrease related to positions taken in prior period	(22,854)
Increase related to positions taken in current period	5,510	1,151	1,959
Reductions related to settlements with taxing authorities	(654)		(1,224)
Reductions related to expiration of statute of limitations	(659)	(660)	(2,494)
Unrecognized tax benefits, ending balance	$ 77,091	$ 95,748	$ 94,604

INCOME TAXES - Valuation Allowa

INCOME TAXES - Valuation Allowance of Gross Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Valuation allowance against gross deferred tax assets:
Valuation allowance, beginning balance	$ 151,427	$ 135,978	$ 142,650
Additions	17,897	25,749	27,459
Deductions	9,690	10,300	34,131
Valuation allowance, ending balance	$ 159,634	$ 151,427	$ 135,978

SHARE-BASED COMPENSATION EXPE_3

SHARE-BASED COMPENSATION EXPENSE - Narrative (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 30, 2021USD ($)period$ / sharesshares	Oct. 31, 2020USD ($)$ / sharesshares	Nov. 02, 2019USD ($)$ / sharesshares
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 | $	$ 143.3
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 | $	$ 0.5	$ 1.3	$ 0.8
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	4,084,000	4,049,000
Total fair value of restricted stock units vested and converted into common stock | $	$ 110	$ 83.5	$ 79.2
Weighted average fair value of each restricted stock unit granted (in dollars per share) | $ / shares	$ 48.70	$ 41.61	$ 34.53
Nonvested award compensation cost not yet recognized, period for recognition	1 year 6 months 3 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	400,000
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)	12,000,000
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	100.00%
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)	12,900,000
Offer period for ESPP	12 months
Number of purchase periods in offer period | period	2
Purchase period	6 months
ESPP discount percentage purchase date	85.00%
Maximum number of shares increase under ESPP (in shares)	8,700,000
Shares issued under ESPP (in shares)	700,000	700,000	1,000,000

SHARE-BASED COMPENSATION EXPE_4

SHARE-BASED COMPENSATION EXPENSE - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Shares Underlying Options Outstanding
Beginning Balance (in shares)	107,000
Granted (in shares)	0	0	0
Exercised (in shares)	(19,000)
Canceled (in shares)	(5,000)
Ending Balance (in shares)	83,000	107,000
Weighted Average Exercise Price
Beginning Balance (in dollars per share)	$ 31.41
Granted (in dollars per share)	0
Exercised (in dollars per share)	30.13
Canceled (in dollars per share)	18.22
Ending Balance (in dollars per share)	$ 32.46	$ 31.41

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. 30, 2021	Oct. 31, 2020
Summarizes information with respect to stock options outstanding
Weighted average exercise price, (in dollars per share)	$ 32.46	$ 31.41
Range of Exercise Price Range One
Summarizes information with respect to stock options outstanding
Range of exercise price, lower (in dollars per share)	11.34
Range of exercise price, upper (in dollars per share)	$ 18.22
Number of underlying shares (in shares)	33
Weighted average remaining contractual life (in years)	1 year 7 months 9 days
Weighted average exercise price, (in dollars per share)	$ 14.36
Aggregate intrinsic value	$ 1,334
Range of Exercise Price Range Two
Summarizes information with respect to stock options outstanding
Range of exercise price, lower (in dollars per share)	$ 32.06
Range of exercise price, upper (in dollars per share)	$ 55.63
Number of underlying shares (in shares)	50
Weighted average remaining contractual life (in years)	1 year 5 months 15 days
Weighted average exercise price, (in dollars per share)	$ 44.69
Aggregate intrinsic value	$ 487
Range of Exercise Price Range Three
Summarizes information with respect to stock options outstanding
Range of exercise price, lower (in dollars per share)	$ 11.34
Range of exercise price, upper (in dollars per share)	$ 55.63
Number of underlying shares (in shares)	83
Weighted average remaining contractual life (in years)	1 year 6 months 7 days
Weighted average exercise price, (in dollars per share)	$ 32.46
Aggregate intrinsic value	$ 1,821

SHARE-BASED COMPENSATION EXPE_6

SHARE-BASED COMPENSATION EXPENSE - Assumptions for Awards Granted (Details) - Performance Based Awards	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
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	41.00%	31.77%	34.10%
Historical volatility of Ciena common stock	42.80%	36.29%	36.80%
Historical volatility of S&P Networking Index	27.30%	18.40%	17.39%
Correlation coefficient	0.6800	0.5891	0.6251
Expected life in years	2 years 10 months 13 days	2 years 10 months 13 days	2 years 10 months 13 days
Risk-free interest rate	0.17%	1.65%	2.62%
Expected dividend yield	0.00%	0.00%	0.00%

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. 30, 2021	Oct. 31, 2020
Summary of Restricted Stock Unit Activity
Restricted shares outstanding, Beginning balance (in shares)	4,049
Restricted stock units outstanding, granted (in shares)	2,350
Restricted stock units outstanding, vested (in shares)	(2,079)
Restricted stock units outstanding, canceled or forfeited (in shares)	(236)
Restricted shares outstanding, Ending balance (in shares)	4,084
Weighted average grant date fair value per share (in dollars per share)	$ 43.67	$ 35.08
Aggregate fair value	$ 221,733	$ 159,498

SHARE-BASED COMPENSATION EXPE_8

SHARE-BASED COMPENSATION EXPENSE - Components of Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Share-based compensation expense
Share-based compensation expense capitalized in inventory, net	$ (72)	$ 118	$ 57
Total share-based compensation	84,336	67,758	59,736
Share-based compensation expense included in cost of goods sold
Share-based compensation expense
Share-based compensation expense included in operating expense	8,589	7,035	6,043
Products
Share-based compensation expense
Share-based compensation expense included in operating expense	3,408	3,182	2,868
Services
Share-based compensation expense
Share-based compensation expense included in operating expense	5,181	3,853	3,175
Share-based compensation expense included in operating expense
Share-based compensation expense
Share-based compensation expense included in operating expense	75,819	60,605	53,636
Research and development
Share-based compensation expense
Share-based compensation expense included in operating expense	21,863	16,987	14,321
Sales and marketing
Share-based compensation expense
Share-based compensation expense included in operating expense	25,152	20,194	16,474
General and administrative
Share-based compensation expense
Share-based compensation expense included in operating expense	$ 28,804	$ 23,424	$ 22,841

SEGMENT AND ENTITY WIDE DISCL_3

SEGMENT AND ENTITY WIDE DISCLOSURES - Narrative (Details) $ in Thousands	12 Months Ended
	Oct. 30, 2021USD ($)segment	Oct. 31, 2020USD ($)
Segment Reporting [Abstract]
Equipment, building, furniture and fixtures, net	$ 284,968	$ 272,377
Operating right-of-use assets	$ 44,285	$ 57,026
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. 30, 2021	Oct. 31, 2020
Segment Reporting Information [Line Items]
Other intangible assets, net	$ 65,314	$ 96,647
Goodwill	311,645	310,847
Maintenance spares, net	55,696	$ 62,077
Networking Platforms
Segment Reporting Information [Line Items]
Other intangible assets, net	8,336
Goodwill	66,405
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	56,978
Goodwill	89,049
Maintenance spares, net	0
Global Services
Segment Reporting Information [Line Items]
Other intangible assets, net	0
Goodwill	0
Maintenance spares, net	$ 55,696

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. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Less: non-performance operating expenses
Selling and marketing	$ 452,214	$ 416,425	$ 423,046
General and administrative	181,874	169,548	174,399
Significant asset impairments and restructuring costs	29,565	22,652	24,538
Amortization of intangible assets	23,732	23,383	21,808
Acquisition and integration costs	2,572	4,031	3,370
Add: other non-performance financial items
Interest and other income (loss), net	(1,768)	964	3,876
Interest expense	(30,837)	(31,321)	(37,452)
Loss on extinguishment and modification of debt	0	(646)	0
Less: Provision (benefit) for income taxes	(37,445)	94,670	59,756
Net income	500,196	361,291	253,434
Operating Segments
Add: other non-performance financial items
Net income	1,185,313	1,123,003	993,927
Operating Segments | Networking Platforms
Add: other non-performance financial items
Net income	850,901	827,105	759,244
Operating Segments | Platform Software and Services
Add: other non-performance financial items
Net income	136,602	105,609	64,210
Operating Segments | Blue Planet Automation Software and Services
Add: other non-performance financial items
Net income	(711)	(12,446)	(17,769)
Operating Segments | Global Services
Add: other non-performance financial items
Net income	$ 198,521	$ 202,735	$ 188,242

SEGMENT AND ENTITY WIDE DISCL_6

SEGMENT AND ENTITY WIDE DISCLOSURES - Entity Wide Reporting (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Oct. 31, 2020
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	$ 329,253	$ 329,403
Canada
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	240,968	214,188
United States
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	50,744	65,321
Other International
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	$ 37,541	$ 49,894

OTHER EMPLOYEE BENEFIT PLANS (D

OTHER EMPLOYEE BENEFIT PLANS (Details)	12 Months Ended
	Oct. 30, 2021CAD ($)	Oct. 30, 2021USD ($)	Oct. 31, 2020CAD ($)	Oct. 31, 2020USD ($)	Nov. 02, 2019CAD ($)	Nov. 02, 2019USD ($)
Defined Contribution Pension Plan Canada
Defined Contribution Plan Disclosure [Line Items]
Maximum total employee and employer contribution percentage	18.00%	18.00%
Maximum total employee and employer contribution amount	$ 27,830	$ 22,469
Required employer contribution percent	1.00%	1.00%
Employer matching percentage for eligible employee contribution	50.00%	50.00%
Percentage of employee contribution with employer matching contribution	6.00%	6.00%
Employer matching contributions	$ 8,300,000	$ 6,700,000	$ 7,000,000	$ 5,700,000	$ 5,200,000	$ 4,200,000
Defined Contribution Profit Sharing Plan
Defined Contribution Plan Disclosure [Line Items]
Employer matching percentage for eligible employee contribution	50.00%	50.00%
Percentage of employee contribution with employer matching contribution	8.00%	8.00%
Employer matching contributions		$ 8,400,000		$ 7,500,000		$ 5,900,000
Maximum employee contribution percentage of pre-tax compensation	60.00%	60.00%
Employer discretionary contribution amount		$ 0

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands, $ in Millions	12 Months Ended					56 Months Ended
	Oct. 30, 2021USD ($)	Oct. 30, 2021CAD ($)	Oct. 31, 2020USD ($)	Nov. 02, 2019USD ($)	Nov. 03, 2018USD ($)government_entity	Oct. 30, 2021USD ($)	Oct. 30, 2021CAD ($)	Oct. 30, 2021CAD ($)	Nov. 03, 2018CAD ($)
Disaggregation of Revenue [Line Items]
Maximum amount of Canadian grant					$ 46,500				$ 57.6
Number of Canadian government entities | government_entity					3
Total revenue | $	$ 3,620,684		$ 3,532,157	$ 3,572,131
Amounts receivable from grant	4,900					$ 4,900		$ 6.1
Grant
Disaggregation of Revenue [Line Items]
Total revenue	$ 8,300	$ 10.4				$ 41,200	$ 51

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details) - USD ($) $ / shares in Units, shares in Millions	Dec. 13, 2021	Dec. 09, 2021	Dec. 13, 2018
Subsequent Event [Line Items]
Stock repurchase program authorized amount			$ 500,000,000
Subsequent Event | Stock Repurchase Program
Subsequent Event [Line Items]
Stock repurchase program authorized amount		$ 1,000,000,000
Subsequent Event | Accelerated Share Repurchase Agreement
Subsequent Event [Line Items]
Stock repurchase program authorized amount	$ 250,000,000
Authorized amount of stock repurchase program (in shares)	2.7
Advance purchase price, percent	80.00%
Share price (in dollars per share)	$ 74.12

Uncategorized Items - cien-2021

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-02 [Member]