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SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS
 12 Months Ended
Oct. 28, 2023
Restructuring and Related Activities [Abstract]  
SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS
Ciena has undertaken a number of restructuring activities intended to reduce expense and align its workforce and costs with market opportunities, product development and business strategies. 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 31, 2020$2,915 $—  $2,915 
Charges5,938 
(1)
23,627 
(2)
29,565 
Cash payments(8,072)(23,627)(31,699)
Balance at October 30, 2021781  —  781 
Charges3,156 
(1)
26,814 
(2)
29,970 
Cash payments(2,722)(22,194)(24,916)
Balance at October 29, 20221,215  4,620  5,835 
Charges6,885 
(1)
16,949 
(2)
23,834 
Cash payments(6,187)(21,569)(27,756)
Balance at October 28, 2023$1,913  $—  $1,913 
Current restructuring liabilities$1,913  $—  $1,913 
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(1) Reflects employee costs associated with workforce reductions 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 real estate facilities.
Significant Asset Impairments

In February 2022, armed conflict escalated between Russia and Ukraine. The United States and certain other countries have imposed sanctions on Russia and could impose further sanctions. On March 7, 2022, Ciena announced its decision to suspend its business operations in Russia immediately. As a result, Ciena recorded impairment charges of approximately $3.8 million of which $1.8 million was a provision for credit losses.