Debt Instrument, Periodic Payment, Principle, Percentage

No definition available.

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Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Prepayment Premium

+ References

No definition available.

+ Details

Name:	cien_DebtInstrumentPrepaymentPremium
Namespace Prefix:	cien_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Variable Rate Basis, Floor

+ References

No definition available.

+ Details

Name:	cien_DebtInstrumentVariableRateBasisFloor
Namespace Prefix:	cien_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-Name Accounting Standards Codification
-Topic 835
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-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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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-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

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-Topic 210
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+ Details

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

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

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+ Details

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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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-Name Accounting Standards Codification
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+ Details

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

- Definition

For a debtor, the aggregate gain (loss) recognized on the restructuring of payables arises from the difference between the book value of the debt before the restructuring and the fair value of the payments on the debt after restructuring is complete.

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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 from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

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-Publisher FASB
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow (outflow) from long-term debt wholly or partially secured by collateral. Excludes tax exempt secured debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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Balance Type:	credit
Period Type:	duration

- Details

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- Details

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- Details

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- Details

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Short-Term and Long-Term Debt (Details) - Secured Debt - USD ($) $ in Thousands			12 Months Ended
	Jan. 23, 2020	Sep. 28, 2018	Oct. 31, 2020	Nov. 02, 2019
Debt Instrument [Line Items]
Deferred debt issuance costs			$ 2,900	$ 3,600
Amortization of debt issuance costs included in interest expense			600
Proceeds from (repayments to) term loan		$ 305,100
New 2025 Term Loan
Debt Instrument [Line Items]
Deferred debt issuance costs			2,939
Fair value of debt			686,100
Outstanding aggregate principal amount	$ 693,000		687,802
Installment payment	1,730
Debt issuance costs expensed	$ 400
Debt discount			1,577
Installment payment, percentage	0.25%
Prepayment premium	1.00%
New 2025 Term Loan \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate floor	0.00%
Basis spread on variable rate	1.75%
New 2025 Term Loan \| Base Rate
Debt Instrument [Line Items]
Interest rate floor	1.00%
Basis spread on variable rate	1.00%
Old 2025 Term Loan
Debt Instrument [Line Items]
Deferred debt issuance costs	$ 3,400		0
Proceeds from term loan		699,100
Outstanding aggregate principal amount	693,000		0
Debt discount	$ 1,900		$ 0
Term Loan Payable due January 30, 2022
Debt Instrument [Line Items]
Repayments of term loan		$ 394,000