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SEGMENT AND ENTITY WIDE DISCLOSURES - Schedule of Ciena's Geographic Distribution of Revenue and Long-lived Assets (Details) - USD ($) $ in Thousands	Nov. 01, 2025	Nov. 02, 2024
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	$ 425,392	$ 365,139
Canada
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	325,584	283,760
United States
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	44,634	49,195
Other International
Ciena's geographic distribution of equipment, furniture and fixtures
Equipment, building, furniture and fixtures, net	$ 55,174	$ 32,184

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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

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No definition available.

+ Details

Name:	cien_PropertyPlantAndEquipmentFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortizationAndOperatingLeaseRightOfUseAsset
Namespace Prefix:	cien_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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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:
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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: