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CIENA CORPORATION AND SIGNIFICANT ACCOUNTING POLICIES AND ESTIMATES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 02, 2024	Oct. 28, 2023
Significant Accounting Policies [Line Items]
Equity investments	$ 21,730	$ 48
Expected economic lives of finite-lived intangible assets (in years)	7 years
Expected number of years Spares usage cost is expensed	4 years
One-time employee termination benefits related to service period (in days)	60 days
Minimum
Significant Accounting Policies [Line Items]
Payment terms and cash received	30 days
Maximum
Significant Accounting Policies [Line Items]
Payment terms and cash received	90 days
Foreign exchange contract maturities	24 months
Equipment, furniture and fixtures | Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	3 years
Equipment, furniture and fixtures | Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	5 years
Software and website development | Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	2 years
Software and website development | Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives capitalized and amortized straight-line (in years)	5 years

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- Definition

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- Definition

Significant Accounting Policies [Line Items]

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- 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.

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- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

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