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Segments and Entity-Wide Disclosures - Geographic Distribution of Equipment, Building, Furniture and Fixtures (Details) - USD ($) $ in Thousands | May 01, 2021 | Oct. 31, 2020
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Equipment, building, furniture and fixtures, net | $ 349,326 | $ 329,403
Canada |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Equipment, building, furniture and fixtures, net | 247,309 | 214,188
United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Equipment, building, furniture and fixtures, net | 59,229 | 65,321
Other International |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Equipment, building, furniture and fixtures, net | $ 42,788 | $ 49,894

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- Definition Property, Plant, and Equipment, Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization and Operating Lease, Right-of-Use Asset + References No definition available. + Details
Name: | cien_PropertyPlantandEquipmentFinanceLeaseRightofUseAssetafterAccumulatedDepreciationandAmortizationandOperatingLeaseRightofUseAsset
Namespace Prefix: | cien_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=cien_OtherInternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |