SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS (Tables)
 6 Months Ended
Apr. 29, 2023
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 six months ended April 29, 2023 (in thousands):
Workforce
reduction		Other restructuring activitiesTotal
Balance at October 29, 2022$1,215 $4,620 $5,835 
Charges2,863 
(1)
9,588 
(2)
12,451 
Cash payments(1,783)(14,208)(15,991)
Balance at April 29, 2023$2,295 $— $2,295 
Current restructuring liabilities$2,295 $— $2,295 

(1) Reflects employee costs associated with workforce reductions during the six months ended April 29, 2023 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.

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 six months ended April 30, 2022 (in thousands):
Workforce
reduction		Other restructuring activitiesTotal
Balance at October 30, 2021$781 $— $781 
Charges1,413 
(1)
7,018 
(2)
8,431 
Cash payments(1,388)(7,018)(8,406)
Balance at April 30, 2022$806 $— $806 
Current restructuring liabilities$806 $— $806 
(1) Reflects employee costs associated with workforce reductions during the six months ended April 30, 2022 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.