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SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS
 12 Months Ended
Nov. 01, 2025
Restructuring and Related Activities [Abstract]  
SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS
Ciena regularly monitors its spending to optimize operating expenses and to ensure that its strategic investments are aligned with its highest-growth demand opportunities. 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 activitiesTotal
Balance at October 29, 2022$1,215 $4,620  $5,835 
Charges6,885 
(1)
16,949 
(2)
23,834 
Cash payments(6,187)(21,569)(27,756)
Balance at October 28, 20231,913  —  1,913 
Charges15,408 
(1)
9,184 
(2)
24,592 
Cash payments(15,394)(9,184)(24,578)
Balance at November 2, 20241,927  —  1,927 
Charges18,622 
(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.