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Restructuring Costs (Tables)
 12 Months Ended
Oct. 31, 2020
Restructuring and Related Activities [Abstract]  
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 Ciena’s Consolidated Balance Sheets, for the fiscal years indicated (in thousands):
Workforce
reduction		Consolidation
of excess
facilities and other restructuring activities		Total
Balance at October 28, 2017$1,291 $1,648  $2,939 
Charges14,853 
(1)
3,890 
(4)
18,743 
Cash payments(14,036)(3,799)(17,835)
Balance at November 3, 20182,108  1,739  3,847 
Charges13,779 
(2)
10,759 
(5)
24,538 
Cash payments(11,904)(1,338)(13,242)
Balance at November 2, 20193,983  11,160  15,143 
Charges7,282 
(3)
15,370 
(6)
22,652 
Adjustments related to ASC 842—  (11,160)
(7)
(11,160)
Cash payments(8,350)(15,370)(23,720)
Balance at October 31, 2020$2,915  $—  $2,915 
Current restructuring liabilities$2,915  $—  $2,915 
Non-current restructuring liabilities$—  $—  $— 
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(1) During fiscal 2018, Ciena recorded a charge of $14.9 million of severance and other employee-related costs associated with a workforce reduction of approximately 240 employees.
(2) During fiscal 2019, Ciena recorded a charge of $13.8 million of severance and other employee-related costs associated with a workforce reduction of approximately 283 employees.
(3) During fiscal 2020, Ciena recorded a charge of $7.3 million of severance and other employee-related costs associated with a workforce reduction of approximately 149 employees.
(4) Reflects unfavorable lease commitments in connection with a portion of facilities located in Petaluma, California and in Gurgaon, India.
(5) Reflects unfavorable lease commitments in connection with a portion of facilities located in Alpharetta, Georgia, Spokane, Washington, Durham, North Carolina and Hanover, Maryland.
(6) Primarily represents costs and imputed interest expense related to restructured facilities and the redesign of certain business processes.
(7) Represents restructuring reserve liability recognized as a reduction to Operating ROU assets, net in relation to adoption of ASC 842. See Notes 1 and 17 for further discussion.