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Commitments and Contingencies (Tables)
12 Months Ended
Oct. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Future annual minimum lease commitments under non-cancelable operating leases The following table summarizes Ciena’s future annual minimum lease commitments under non-cancelable leases that are not recorded on the balance sheet as of October 31, 2019 (in thousands):

 
 
2020
 
2021
 
2022
 
2023
 
2024
 
Thereafter
 
Total
Operating leases
 
$
28,776

 
$
24,184

 
$
16,767

 
$
13,393

 
$
10,632

 
$
26,110

 
$
119,862