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INCOME TAXES (Details) $ in Millions	3 Months Ended
	Jul. 31, 2021 USD ($)
Income Tax Disclosure [Abstract]
Intra-entity transfer of non-US intellectual property rights, income tax benefit	$ (124.2)

X

- Definition

Effective Income Tax Rate Reconciliation, Intra-Entity Transfer Of Foreign Intellectual Property Rights, Amount

+ References

No definition available.

+ Details

Name:	cien_EffectiveIncomeTaxRateReconciliationIntraEntityTransferOfForeignIntellectualPropertyRightsAmount
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_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration