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Ciena Corporation and Significant Accounting Policies and Estimates - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2020 | Nov. 03, 2019 | Nov. 02, 2019 | Nov. 03, 2018 | Nov. 01, 2017 | Oct. 31, 2017
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Equity investments | $ 13,408 |  | $ 10,727 |  |  |
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 | $ 375,000 |  |  |  |  |
Stockholder's equity | $ 2,509,597 |  | 2,172,761 | $ 1,929,334 |  | $ 2,136,342
One-time employee termination benefits related to service period (in days) | 60 days |  |  |  |  |
Operating right-of-use assets | $ 57,026 | $ 53,334 |  |  |  |
Operating lease liabilities | 80,450 | $ 76,000 |  |  |  |
Restructuring reserve | $ 2,915 |  | 15,143 | 3,847 |  | 2,939
Effect of adoption of new accounting standard |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stockholder's equity |  |  |  | $ 49,805 |  | 62,123
Restructuring reserve |  |  | (11,160) |  |  |
Facility Closing, Vacated Office Space |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restructuring reserve |  |  | 11,100 |  |  |
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 |  |  |  |  |
3.75% Convertible Senior Notes due October 15, 2018 (New) |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Interest rate on convertible notes | 3.75% |  |  | 0.0375% |  |
Retained Earnings |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stockholder's equity | $ (4,283,122) |  | $ (4,644,413) | $ (4,947,652) |  | (4,664,253)
Retained Earnings | Effect of adoption of new accounting standard |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stockholder's equity |  |  |  | $ 49,805 |  | $ 61,291
Retained Earnings | Accounting Standards Update 2016-09 | Effect of adoption of new accounting standard |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stockholder's equity |  |  |  |  | $ 62,100 |

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