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GOODWILL (Tables) | 12 Months Ended
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Oct. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill allocated by reportable segments | The following table presents the goodwill allocated to Ciena’s operating segments as of October 30, 2021 and October 31, 2020, as well as the changes to goodwill during fiscal 2021 (in thousands):
| Balance at October 31, 2020 |  | Acquisitions |  | Impairments |  | Translation |  | Balance at October 30, 2021
Platform Software and Services | $ | 156,191 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 156,191 |
Blue Planet Automation Software and Services | 89,049 |  |  | — |  |  | — |  |  | — |  |  | 89,049 |
Networking Platforms | 65,607 |  |  | — |  |  | — |  |  | 798 |  |  | 66,405 |
Total | $ | 310,847 |  |  | $ | — |  |  | $ | — |  |  | $ | 798 |  |  | $ | 311,645 |

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