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RESTRUCTURING COSTS
 9 Months Ended
Jul. 31, 2021
Restructuring and Related Activities [Abstract]  
RESTRUCTURING COSTS RESTRUCTURING COSTS
Ciena has undertaken a number of restructuring activities intended to reduce expense and to ensure better alignment of 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 Condensed Consolidated Balance Sheets, for the nine months ended July 31, 2021 (in thousands):
Workforce
reduction		Other restructuring activitiesTotal
Balance at October 31, 2020$2,915 $— $2,915 
Charges5,306 
(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 activitiesTotal
Balance at November 2, 2019$3,983 $11,160 $15,143 
Charges5,015 
(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.