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INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jan. 29, 2022 | Jan. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Aggregate amortization expense of intangible assets | $ 12,230 | $ 9,642

X
- Definition Amortization of Intangible Assets Excluding Amortization Included in Property, Plant and Equipment + References No definition available. + Details
Name: | cien_AmortizationOfIntangibleAssetsExcludingAmortizationIncludedInPropertyPlantAndEquipment
Namespace Prefix: | cien_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration