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

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

No definition available.

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