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Short-Term and Long-Term Debt (Tables)
 6 Months Ended
Apr. 30, 2019
Debt Disclosure [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Convertible Notes
The net carrying value of Ciena’s Term Loan due September 28, 2025 (the “2025 Term Loan”) was comprised of the following for the fiscal periods indicated (in thousands):
 
 
April 30, 2019
 
October 31, 2018
Term Loan Payable due September 28, 2025
 
$
690,429

 
$
693,450
Schedule of Debt Details
The principal balance, unamortized debt discount, deferred debt issuance costs, net carrying value and fair value of the 2025 Term Loan were as follows as of April 30, 2019 (in thousands):
 
 
 
 
 
 
 
 
 
 
 
Principal Balance
 
Unamortized Debt Discount
 
Deferred Debt Issuance Costs
 
Net Carrying Value
 
Fair Value(1)
Term Loan Payable due September 28, 2025
$
696,500

 
$
(2,129
)
 
$
(3,942
)
 
$
690,429

 
$
696,500



(1)
The 2025 Term Loan is categorized as Level 2 in the fair value hierarchy. Ciena estimated the fair value of the 2025 Term Loan using a market approach based upon observable inputs, such as current market transactions involving comparable securities.