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INVENTORIES (Tables) | 12 Months Ended
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Oct. 30, 2021
Inventory Disclosure [Abstract] |
Inventories | As of the dates indicated, inventories are comprised of the following (in thousands):
| October 30, 2021 |  | October 31, 2020
Raw materials | $ | 175,399 |  |  | $ | 119,481 |
Work-in-process | 10,260 |  |  | 13,738 |
Finished goods | 180,800 |  |  | 210,050 |
Deferred cost of goods sold | 44,765 |  |  | 40,747 |
| 411,224 |  |  | 384,016 |
Reserve for excess and obsolescence | (36,959) |  |  | (39,637) |
| $ | 374,265 |  |  | $ | 344,379 |
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
November 2, 2019 |  | $ | 50,938 |  |  | $ | 28,085 |  |  | $ | 31,701 |  |  | $ | 47,322 |
October 31, 2020 |  | $ | 47,322 |  |  | $ | 24,701 |  |  | $ | 32,386 |  |  | $ | 39,637 |
October 30, 2021 |  | $ | 39,637 |  |  | $ | 17,850 |  |  | $ | 20,528 |  |  | $ | 36,959 |

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