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Inventory - Schedule of Activity in Reserve for Excess and Obsolete Inventory (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 01, 2025	Nov. 02, 2024	Oct. 28, 2023
Reserve for excess and obsolete inventory [Roll Forward]
Valuation allowance, beginning balance	$ 107,173	$ 50,003	$ 36,086
Provisions	48,424	77,341	29,464
Disposals	26,189	20,171	15,547
Valuation allowance, ending balance	$ 129,408	$ 107,173	$ 50,003

X

- Definition

Inventory Valuation Reserves, Disposals

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Inventory Valuation Reserves [Roll Forward]

+ References

No definition available.

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Namespace Prefix:	cien_
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- Definition

Amount of valuation reserve for inventory.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 330
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.BB)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480581/330-10-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 330
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483080/330-10-50-2

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