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Leases - Narrative (Details) ft² in Millions, $ in Millions | 3 Months Ended
--- | ---
Jan. 30, 2021 USD ($) ft²
Leases [Abstract] |
Area leased (in sq ft) | ft² | 1.3
Remaining lease term (up to) | 11 years
Extension term (up to) | 10 years
Termination period (up to) | 5 years
ROU assets that involve subleased or vacant space | $ | $ 4.7

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- Definition Lease, Remaining Lease Term + References No definition available. + Details
Name: | cien_LeaseRemainingLeaseTerm
Namespace Prefix: | cien_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Lease, Renewal Term + References No definition available. + Details
Name: | cien_LesseeLeaseRenewalTerm
Namespace Prefix: | cien_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Lease, Termination Period + References No definition available. + Details
Name: | cien_LesseeLeaseTerminationPeriod
Namespace Prefix: | cien_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, Operating Lease, Area of Property Leased + References No definition available. + Details
Name: | cien_LesseeOperatingLeaseAreaofPropertyLeased
Namespace Prefix: | cien_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Lessee, Operating Lease, Right-of-Use Asset, Subleased or Vacant + References No definition available. + Details
Name: | cien_LesseeOperatingLeaseRightOfUseAssetSubleasedOrVacant
Namespace Prefix: | cien_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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