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Restructuring Costs
 3 Months Ended
Jan. 30, 2021
Restructuring and Related Activities [Abstract]  
Restructuring Costs RESTRUCTURING COSTS
Ciena has undertaken a number of restructuring activities intended to reduce expense and to better 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 Condensed Consolidated Balance Sheets, for the three months ended January 30, 2021 (in thousands):
Workforce
reduction		Consolidation
of excess
facilities and other restructuring activities		Total
Balance at October 31, 2020$2,915 $— $2,915 
Charges1,990 
(1)
3,877 
(2)
5,867 
Cash payments(2,994)(3,877)(6,871)
Balance at January 30, 2021$1,911 $— $1,911 
Current restructuring liabilities$1,911 $— $1,911 

(1) Reflects a global workforce reduction of 50 employees during the three months ended January 30, 2021 as part of a business optimization strategy to improve gross margin, constrain operating expense and redesign certain business processes.
(2) Primarily represents costs and imputed interest expense related to restructured facilities and the redesign of certain business processes.

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 three months ended February 1, 2020 (in thousands):
Workforce
reduction		Consolidation
of excess
facilities		Total
Balance at November 2, 2019$3,983 $11,160 $15,143 
Charges1,204 
(1)
3,268 
(2)
4,472 
Adjustments related to ASC 842— (11,160)
(3)
(11,160)
Cash payments(2,955)(3,268)(6,223)
Balance at February 1, 2020$2,232 $— $2,232 
Current restructuring liabilities$2,232 $— $2,232 
(1) Reflects a global workforce reduction of approximately 22 employees during the three months ended February 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.