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RESTRUCTURING COSTS (Tables) | 9 Months Ended
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Jul. 31, 2021
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 Condensed Consolidated Balance Sheets, for the nine months ended July 31, 2021 (in thousands):
| Workforce reduction |  | Other restructuring activities |  | Total
Balance at October 31, 2020 | $ | 2,915 |  |  | $ | — |  |  | $ | 2,915 |
Charges | 5,306 |  | (1) | 18,558 |  | (2) | 23,864 |
Cash payments | (7,051) |  |  | (18,558) |  |  | (25,609) |
Balance at July 31, 2021 | $ | 1,170 |  |  | $ | — |  |  | $ | 1,170 |
Current restructuring liabilities | $ | 1,170 |  |  | $ | — |  |  | $ | 1,170 |
(1) Reflects a global workforce reduction of 120 employees during the nine months ended July 31, 2021 as part of a business optimization strategy to improve gross margin, constrain operating expense and redesign certain business processes. (2) Primarily represents the redesign of certain business processes associated with Ciena’s supply chain and distribution structure reorganization, and costs related to restructured 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 Ciena’s Condensed Consolidated Balance Sheets for the nine months ended August 1, 2020 (in thousands):
| Workforce reduction |  | Other restructuring activities |  | Total
Balance at November 2, 2019 | $ | 3,983 |  |  | $ | 11,160 |  |  | $ | 15,143 |
Charges | 5,015 |  | (1) | 9,783 |  | (2) | 14,798 |
Adjustments related to ASC 842 | — |  |  | (11,160) |  | (3) | (11,160) |
Cash payments | (7,335) |  |  | (9,783) |  |  | (17,118) |
Balance at August 1, 2020 | $ | 1,663 |  |  | $ | — |  |  | $ | 1,663 |
Current restructuring liabilities | $ | 1,663 |  |  | $ | — |  |  | $ | 1,663 |
(1) Reflects a global workforce reduction of approximately 79 employees during the nine months ended August 1, 2020 as part of a business optimization strategy to improve gross margin, constrain operating expense and redesign certain business processes. (2) Primarily represents variable costs and imputed interest expense related to restructured facilities. (3) Represents restructuring reserve liability recognized as a reduction to Operating right-of-use (“ROU”) assets, net in relation to adoption of ASC 842.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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