INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
Apr. 30, 2022	May 01, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Aggregate amortization expense of intangible assets	$ 24,463	$ 18,517

Amortization of Intangible Assets Excluding Amortization Included in Property, Plant and Equipment

No definition available.

Name:	cien_AmortizationOfIntangibleAssetsExcludingAmortizationIncludedInPropertyPlantAndEquipment
Namespace Prefix:	cien_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration