Debt Instrument, Event Of Default, Percent Of Principal, Threshold

No definition available.

Name:	cien_DebtInstrumentEventOfDefaultPercentOfPrincipalThreshold
Namespace Prefix:	cien_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of amortization expense attributable to debt issuance costs.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

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+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cien_NewTermLoan2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
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Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Period Type:

- Details

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SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 18, 2022	Apr. 30, 2022	May 01, 2021	Oct. 30, 2021	Jan. 23, 2020
Secured Debt \| 2025 Term Loan
Debt Instrument [Line Items]
Aggregate principal amount		$ 677,407			$ 693,000
Debt issuance costs, net		2,037		$ 2,300
Amortization of debt issuance costs		300	$ 300
Fair value of debt		677,500
Senior Notes \| 2030 Senior Notes 4.00% fixed-rate
Debt Instrument [Line Items]
Aggregate principal amount		400,000
Amortization of debt issuance costs		200
Fair value of debt		$ 363,000
Debt instrument, face amount	$ 400,000
Debt instrument, interest rate, stated percentage	4.00%	4.00%
Proceeds from issuance of debt	$ 395,500
Event of default, percent of principal, threshold	25.00%
Deferred Debt Issuance Costs		$ 5,169
Senior Notes \| 2030 Senior Notes 4.00% fixed-rate \| Prior to January 31, 2025
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%
Debt instrument, redemption price, percentage of principal amount redeemed	102.00%
Senior Notes \| 2030 Senior Notes 4.00% fixed-rate \| On or After January 31, 2025
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	104.00%
Debt instrument, redemption price, percentage of principal amount redeemed	40.00%
Senior Notes \| 2030 Senior Notes 4.00% fixed-rate \| Change of Control Triggering Event
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	101.00%