XML 121 R107.htm IDEA: XBRL DOCUMENT v3.21.2

INCOME TAXES - Valuation Allowance of Gross Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Nov. 02, 2019
Valuation allowance against gross deferred tax assets:
Valuation allowance, beginning balance	$ 151,427	$ 135,978	$ 142,650
Additions	17,897	25,749	27,459
Deductions	9,690	10,300	34,131
Valuation allowance, ending balance	$ 159,634	$ 151,427	$ 135,978

X

- Definition

Valuation Allowance, Deferred Tax Asset, Additions

+ References

No definition available.

+ Details

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

X

- Definition

Valuation Allowance, Deferred Tax Asset, Deductions

+ References

No definition available.

+ Details

Name:	cien_ValuationAllowanceDeferredTaxAssetDeductions
Namespace Prefix:	cien_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

+ Details

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

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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