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CANADIAN EMERGENCY WAGE SUBSIDY - Narrative (Details) $ in Thousands, $ in Millions	12 Months Ended
	Oct. 30, 2021 CAD ($)	Oct. 30, 2021 USD ($)	Oct. 31, 2020 CAD ($)	Oct. 31, 2020 USD ($)	Oct. 30, 2021 USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Amounts receivable from grant	$ 6.1				$ 4,900
Canadian Emergency Wage Subsidy
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit	$ 52.2	$ 41,280		$ 0
Grants, Canada Emergency Wage Subsidy, 2020 Employee Wages
Unusual or Infrequent Item, or Both [Line Items]
Total CEWS benefit			$ 43.9	$ 35,400
Amounts receivable from grant					$ 0

X

- Definition

Grant Subsidies To Offset Expenses

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

X

- 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

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

X

- Details

Name:	srt_ProductOrServiceAxis=cien_GrantsCanadaEmergencyWageSubsidyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=cien_GrantsCanadaEmergencyWageSubsidy2020EmployeeWagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: