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INVENTORIES (Tables) | 12 Months Ended
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Oct. 28, 2023
Inventory Disclosure [Abstract] |
Schedule of Inventories | As of the dates indicated, inventories are comprised of the following (in thousands):
| October 28, 2023 |  | October 29, 2022
Raw materials | $ | 664,797 |  |  | $ | 664,916 |
Work-in-process | 55,242 |  |  | 18,232 |
Finished goods | 314,168 |  |  | 258,584 |
Deferred cost of goods sold | 66,634 |  |  | 41,084 |
Gross inventories | 1,100,841 |  |  | 982,816 |
Reserve for excess and obsolescence | (50,003) |  |  | (36,086) |
Inventories, net | $ | 1,050,838 |  |  | $ | 946,730 |
Schedule of Activity in Reserve for Excess and Obsolete Inventory | The following table summarizes the activity in Ciena’s reserve for excess and obsolete inventory for the fiscal years indicated (in thousands):
Year Ended |  | Beginning Balance |  | Provisions |  | Disposals |  | Ending Balance
October 30, 2021 |  | $ | 39,637 |  |  | $ | 17,850 |  |  | $ | 20,528 |  |  | $ | 36,959 |
October 29, 2022 |  | $ | 36,959 |  |  | $ | 16,184 |  |  | $ | 17,057 |  |  | $ | 36,086 |
October 28, 2023 |  | $ | 36,086 |  |  | $ | 29,464 |  |  | $ | 15,547 |  |  | $ | 50,003 |

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