Nominal or face amount used to calculate payments on the derivative asset.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SX 210.12-13(Column A)(Footnote 3))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5C
-Subparagraph (SX 210.12-13C(Column E))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5C

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5A
-Subparagraph (SX 210.12-13A(Column D))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5A

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5B
-Subparagraph (SX 210.12-13B(Column B))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5B

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

+ Details

Name:	us-gaap_DerivativeAssetNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E

+ Details

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

- Definition

Fixed interest rate that will be received or paid upon exercise of the interest rate swaption contract.

+ References

No definition available.

+ Details

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

- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_NetInvestmentHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_IN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cien_TermLoan2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cien_TermLoan2030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cien_NewTermLoan2030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Millions	12 Months Ended
DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Millions	Oct. 28, 2023	Jan. 31, 2023	Oct. 29, 2022	Apr. 30, 2022	Oct. 31, 2018
Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract maturities	24 months
Foreign Currency Forward Contracts \| Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 226.3		$ 108.0
Foreign Currency Forward Contracts \| Not Designated as Hedging Instrument \| Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract maturities	12 months
Foreign Currency Forward Contracts \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 367.3		$ 272.2
Foreign Currency Forward Contracts \| Cash Flow Hedging \| Designated as Hedging Instrument \| Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contract maturities	24 months
Foreign Currency Forward Contracts \| Net Investment Hedging \| Designated as Hedging Instrument \| INDIA
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 48.0
Foreign exchange contract maturities	24 months
Forward starting interest rate swaps \| Cash Flow Hedging \| Designated as Hedging Instrument \| Term Loan 2025 \| Secured Debt
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract		$ 350.0			$ 350.0
Fixed interest amount resulting from interest rate swap		2.883%			2.957%
Forward starting interest rate swaps \| Cash Flow Hedging \| Designated as Hedging Instrument \| Term Loan 2025 \| Secured Debt \| SOFR
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 350.0
Forward starting interest rate swaps \| Cash Flow Hedging \| Designated as Hedging Instrument \| 2030 Term Loan \| Secured Debt
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract	$ 350.0
Fixed interest amount resulting from interest rate swap		3.47%
Forward starting interest rate swaps \| Cash Flow Hedging \| Designated as Hedging Instrument \| 2030 New Term Loan \| Secured Debt
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract		$ 350.0
Forward starting interest rate swaps \| Cash Flow Hedging \| Designated as Hedging Instrument \| 2030 New Term Loan \| Secured Debt \| SOFR
Derivative Instruments, Gain (Loss) [Line Items]
Notional principal of contract				$ 350.0
Fixed interest amount resulting from interest rate swap				2.968%