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CIENA CORPORATION AND SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Oct. 30, 2021 | Oct. 31, 2020 | Nov. 04, 2018
Significant Accounting Policies [Line Items] |  |  |
Cost method equity investments | $ 8,578 | $ 13,408 |
Expected economic lives of finite-lived intangible assets (in years) | 7 years |  |
Expected number of years Spares usage cost is expensed | 4 years |  |
Cumulative amount of temporary differences for unremitted foreign earnings for which a deferred tax liability has not been recognized | $ 475,000 |  |
One-time employee termination benefits related to service period (in days) | 60 days |  |
Accumulated deficit | $ (3,785,132) | $ (4,283,122) |
Effect of adoption of new accounting standard | Accounting Standards Update 2014-09 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Accumulated deficit |  |  | $ 49,800
Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Payment terms and cash received | 30 days |  |
Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Payment terms and cash received | 90 days |  |
Foreign exchange contract maturities | 24 months |  |
Equipment, furniture and fixtures | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives capitalized and amortized straight-line (in years) | 2 years |  |
Equipment, furniture and fixtures | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives capitalized and amortized straight-line (in years) | 5 years |  |
Software and website development | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives capitalized and amortized straight-line (in years) | 2 years |  |
Software and website development | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives capitalized and amortized straight-line (in years) | 5 years |  |

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