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Inventories
 3 Months Ended
Jan. 31, 2020
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
As of the dates indicated, inventories are comprised of the following (in thousands):
 
January 31,
2020
 
October 31,
2019
Raw materials
$
106,522

 
$
99,041

Work-in-process
11,728

 
13,657

Finished goods
219,907

 
226,622

Deferred cost of goods sold
49,256

 
53,051

Gross inventories
387,413

 
392,371

Provision for excess and obsolescence
(44,740
)
 
(47,322
)
Inventories, net
$
342,673

 
$
345,049



Ciena writes down its inventory for estimated obsolescence or unmarketable inventory by an amount equal to the difference between the cost of inventory and the estimated net realizable value based on assumptions about future demand, which are affected by changes in Ciena’s strategic direction, discontinuance of a product or introduction of newer versions of products, declines in the sales of or forecasted demand for certain products, and general market conditions. During the first three months of fiscal 2020, Ciena recorded a provision for excess and obsolescence of $6.7 million, primarily related to a decrease in the forecasted demand for certain Networking Platforms products. Deductions from the provision for excess and obsolete inventory relate primarily to disposal activities.