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SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS (Tables) | 9 Months Ended
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Aug. 02, 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 the Condensed Consolidated Balance Sheets for the nine months ended August 2, 2025 (in thousands):
| Workforce reduction |  | Other restructuring activities |  | Total
Balance at November 2, 2024 | $ | 1,927 |  |  | $ | — |  |  | $ | 1,927 |
Charges | 1,996 |  |  | 3,266 |  | (1) | 5,262 |
Cash payments | (3,389) |  |  | (3,266) |  |  | (6,655) |
Balance at August 2, 2025 | $ | 534 |  |  | $ | — |  |  | $ | 534 |
Current restructuring liabilities | $ | 534 |  |  | $ | — |  |  | $ | 534 |
(1) Primarily represents costs related to restructured real estate facilities. The following table sets forth the restructuring activity and balance of the restructuring liability accounts, which are included in accrued liabilities and other short-term obligations on the Condensed Consolidated Balance Sheets for the nine months ended July 27, 2024 (in thousands):
| Workforce reduction |  | Other restructuring activities |  | Total
Balance at October 28, 2023 | $ | 1,913 |  |  | $ | — |  |  | $ | 1,913 |
Charges | 13,708 |  | (1) | 8,279 |  | (2) | 21,987 |
Cash payments | (14,379) |  |  | (8,279) |  |  | (22,658) |
Balance at July 27, 2024 | $ | 1,242 |  |  | $ | — |  |  | $ | 1,242 |
Current restructuring liabilities | $ | 1,242 |  |  | $ | — |  |  | $ | 1,242 |
(1) Reflects a global workforce reduction of approximately 390 employees during the nine months ended July 27, 2024 as part of a business optimization strategy to improve gross margin, constrain operating expense and redesign certain business processes. (2) Primarily represents costs related to restructured real estate facilities and the redesign of certain business processes associated with Ciena’s supply chain and distribution structure reorganization.

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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 + Details
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