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Restructuring Costs (Tables) | 12 Months Ended
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Oct. 31, 2020
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 reduction |  | Consolidation of excess facilities and other restructuring activities |  | Total
Balance at October 28, 2017 | $ | 1,291 |  |  | $ | 1,648 |  |  | $ | 2,939 |
Charges | 14,853 |  | (1) | 3,890 |  | (4) | 18,743 |
Cash payments | (14,036) |  |  | (3,799) |  |  | (17,835) |
Balance at November 3, 2018 | 2,108 |  |  | 1,739 |  |  | 3,847 |
Charges | 13,779 |  | (2) | 10,759 |  | (5) | 24,538 |
Cash payments | (11,904) |  |  | (1,338) |  |  | (13,242) |
Balance at November 2, 2019 | 3,983 |  |  | 11,160 |  |  | 15,143 |
Charges | 7,282 |  | (3) | 15,370 |  | (6) | 22,652 |
Adjustments related to ASC 842 | — |  |  | (11,160) |  | (7) | (11,160) |
Cash payments | (8,350) |  |  | (15,370) |  |  | (23,720) |
Balance at October 31, 2020 | $ | 2,915 |  |  | $ | — |  |  | $ | 2,915 |
Current restructuring liabilities | $ | 2,915 |  |  | $ | — |  |  | $ | 2,915 |
Non-current restructuring liabilities | $ | — |  |  | $ | — |  |  | $ | — |
_________________________________ (1) During fiscal 2018, Ciena recorded a charge of $14.9 million of severance and other employee-related costs associated with a workforce reduction of approximately 240 employees. (2) 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. (3) 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. (4) Reflects unfavorable lease commitments in connection with a portion of facilities located in Petaluma, California and in Gurgaon, India. (5) Reflects unfavorable lease commitments in connection with a portion of facilities located in Alpharetta, Georgia, Spokane, Washington, Durham, North Carolina and Hanover, Maryland. (6) Primarily represents costs and imputed interest expense related to restructured facilities and the redesign of certain business processes. (7) Represents restructuring reserve liability recognized as a reduction to Operating ROU assets, net in relation to adoption of ASC 842. See Notes 1 and 17 for further discussion.

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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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