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Inventories | 3 Months Ended
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Jan. 30, 2021
Inventory Disclosure [Abstract] |
Inventories | INVENTORIES As of the dates indicated, inventories are comprised of the following (in thousands):
| January 30, 2021 |  | October 31, 2020
Raw materials | $ | 123,388 |  |  | $ | 119,481 |
Work-in-process | 11,353 |  |  | 13,738 |
Finished goods | 257,048 |  |  | 210,050 |
Deferred cost of goods sold | 38,920 |  |  | 40,747 |
Gross inventories | 430,709 |  |  | 384,016 |
Provision for excess and obsolescence | (40,976) |  |  | (39,637) |
Inventories, net | $ | 389,733 |  |  | $ | 344,379 |
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 2021, Ciena recorded a provision for excess and obsolescence of $5.9 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.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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