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INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 01, 2025	Nov. 02, 2024	Oct. 28, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 36,205	$ 40,624	$ 49,616

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- 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