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Goodwill
 12 Months Ended
Oct. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL GOODWILL

During fiscal 2019, Ciena separated its previous Software and Software-Related Services segment into two stand-alone operating segments: Blue Planet Automation Software and Services and Platform Software and Services. Ciena was required to separate this operating segment as a result of an internal realignment to support its corporate strategy to further promote customer adoption of its Blue Planet Automation Software and Services, and corresponding changes by management to the evaluation of resource allocation for and measurement of performance of this business. Accordingly, as of the end of fiscal 2019, for reporting purposes, our results of operations are presented based on the following operating segments: (i) Networking Platforms; (ii) Platform Software and Services; (iii) Blue Planet Automation Software and Services; and (iv) Global Services.

As a result of the separation of Platform Software and Services and Blue Planet Automation Software and Services into separate operating segments, Ciena allocated the $232.2 million of goodwill previously allocated to the combined Software and Software Related-Services segment to the two separate operating segments based on each operating segments relative fair value using a discounted cash flow model. The following table presents the goodwill allocated to Ciena’s operating segments as of October 31, 2019 and October 31, 2018, as well as the changes to goodwill during fiscal 2019 (in thousands):
 
Balance at October 31, 2018
 
Reallocation
 
Acquisitions
 
Impairments
 
Translation
 
Balance at October 31, 2019
Software and Software Related Services
$
232,185

 
$
(232,185
)
 
$
—

 
$
—

 
$
—

 
$
—

Platform Software and Services
—

 
156,191

 
—

 
—

 
—

 
156,191

Blue Planet Automation Software and Services
—

 
75,994

 
—

 
—

 
—

 
75,994

Networking Platforms
65,783

 
—

 
—

 
—

 
(31
)
 
65,752

Total
$
297,968

 
$
—

 
$
—

 
$
—

 
$
(31
)
 
$
297,937