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SEGMENT AND ENTITY WIDE DISCLOSURES (Tables)

12 Months Ended

Nov. 01, 2025

Segment Reporting [Abstract]

Schedule of Segment Profit (Loss) and the Reconciliation to Consolidated Net Income (Loss)

The table below sets forth Ciena’s segment profit (loss) and the reconciliation to consolidated net income for the respective periods indicated (in thousands). The CODM excludes the following items in his assessment of performance of the operating segments: selling and marketing costs; general and administrative costs; significant asset impairments and restructuring costs; share-based compensation expense, amortization of intangible assets; acquisition and integration costs; interest and other income, net; interest expense; loss on extinguishment and modification of debt; and provision for income taxes. Effective as of the fourth quarter of fiscal 2025, Ciena recast its segment profit (loss) to align with the CODM assessment of performance of the operating segments to exclude share-based compensation expense. This change affects only the presentation of such information:

			Year Ended
			November 1, 2025						November 2, 2024						October 28, 2023
Revenue:
Networking Platforms			$	3,676,377					$	3,042,055					$	3,493,492
Platform Software and Services			363,830						358,062						303,873
Blue Planet Automation Software and Services			115,547						77,619						69,170
Global Services			613,753						537,219						520,014
Total revenue			$	4,769,507					$	4,014,955					$	4,386,549
Segment gross profit:
Networking Platforms			$	1,445,373					$	1,199,978					$	1,421,947
Platform Software and Services			307,320						305,486						258,031
Blue Planet Automation Software and Services			67,239						35,494						18,458
Global Services			218,390						208,904						207,667
Total segment gross profit			$	2,038,322					$	1,749,862					$	1,906,103
Research and development expense:
Networking Platforms			$	671,315					$	605,808					$	597,644
Platform Software and Services			72,186						65,145						64,641
Blue Planet Automation Software and Services			35,996						37,889						41,802
Global Services			4,551						4,526						4,141
Total segment research and development expense			$	784,048					$	713,368					$	708,228
Segment profit (loss):
Networking Platforms			$	774,058					$	594,170					$	824,303
Platform Software and Services			235,134						240,341						193,390
Blue Planet Automation Software and Services			31,243						(2,395)						(23,344)
Global Services			213,839						204,378						203,526
Total segment profit			$	1,254,274					$	1,036,494					$	1,197,875
Less: Unallocated cost of goods sold			$	33,405					$	30,272					$	27,252
Less: Unallocated operating and non-operating expenses			1,097,531						922,266						915,796
Consolidated net income			$	123,338					$	83,956					$	254,827

Schedule of Reconciliation of Assets from Segment to Consolidated

As of November 1, 2025, finite-lived intangible assets, goodwill, and maintenance spares are assigned to asset groups within the following segments (in thousands):

			November 1, 2025
			Networking Platforms						Platform Software and Services						Blue Planet Automation Software and Services						Global Services						Total
Other intangible assets, net			$	224,210					$	—					$	—					$	—					$	224,210
Goodwill			$	275,964					$	156,191					$	89,049					$	—					$	521,204
Maintenance spares, net			$	—					$	—					$	—					$	92,392					$	92,392

			November 2, 2024
			Networking Platforms						Platform Software and Services						Blue Planet Automation Software and Services						Global Services						Total
Other intangible assets, net			$	158,903					$	—					$	6,117					$	—					$	165,020
Goodwill			$	199,467					$	156,191					$	89,049					$	—					$	444,707
Maintenance spares, net			$	—					$	—					$	—					$	77,918					$	77,918

As of November 1, 2025, finite-lived intangible assets, goodwill, and maintenance spares allocated by segment reconciled to total assets (in thousands):

			November 1, 2025						November 2, 2024
Assets assigned to segments			$	837,806					$	687,645
Other unallocated assets			5,026,861						4,953,692
Total assets			$	5,864,667					$	5,641,337

Schedule of Ciena's Geographic Distribution of Revenue and Long-lived Assets

The following table shows Ciena’s geographic distribution of equipment, building, furniture and fixtures, net, and operating ROU assets (in thousands) for any country accounting for at least 10% of the total. Any countries representing less than 10% are reflected in aggregate as “Other International.”

			November 1, 2025						November 2, 2024
Canada			$	325,584					$	283,760
United States			44,634						49,195
Other International			55,174						32,184
Total			$	425,392					$	365,139

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- Definition

Tabular disclosure of all significant reconciling items in the reconciliation of total assets from reportable segments to the entity's consolidated assets.

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Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment.

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