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SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS (Tables)

12 Months Ended

Nov. 01, 2025

Restructuring and Related Activities [Abstract]

Schedule Of Activity and Balance of the Restructuring Liability Accounts

The following table sets forth the restructuring activity and balance of the restructuring liability accounts, which are included in accrued liabilities and other short-term obligations on Ciena’s Consolidated Balance Sheets, for the fiscal years indicated (in thousands):

			Workforce reduction						Other restructuring activities						Total
Balance at October 29, 2022			$	1,215					$	4,620					$	5,835
Charges			6,885			(1)			16,949			(2)			23,834
Cash payments			(6,187)						(21,569)						(27,756)
Balance at October 28, 2023			1,913						—						1,913
Charges			15,408			(1)			9,184			(2)			24,592
Cash payments			(15,394)						(9,184)						(24,578)
Balance at November 2, 2024			1,927						—						1,927
Charges			18,622			(1)			93,491			(3)			112,113
Cash payments			(12,113)						(93,491)						(105,604)
Balance at November 1, 2025			$	8,436					$	—					$	8,436
Current restructuring liabilities			$	8,436					$	—					$	8,436

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(1) Reflects employee costs associated with global workforce reductions of approximately 380, 420 and 120 employees during fiscal 2025, 2024 and 2023, respectively, as part of a business optimization strategy to reduce operating costs.

(2) Primarily represents the redesign of certain business processes associated with Ciena’s supply chain and distribution structure, and costs related to restructured real estate facilities.

(3) Primarily related to the abandonment of an in-process R&D intangible asset associated with the decision to cease investment in 25G PON, within the routing and switching product line of the Network Platforms operating segment.

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- References

No definition available.

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- Definition

Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

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