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SHARE-BASED COMPENSATION EXPENSE - Schedule of Assumptions for Awards Granted (Details) - Performance Based Awards	12 Months Ended
	Nov. 01, 2025	Nov. 02, 2024	Oct. 28, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility of Ciena common stock, which is a weighted average of implied volatility and historical volatility	41.89%	36.00%	40.37%
Historical volatility of Ciena common stock	39.90%	36.74%	43.11%
Volatility of S&P Networking Index	47.99%	44.94%	30.93%
Correlation coefficient	0.3039	0.3665	0.7781
Expected life in years	2 years 10 months 13 days	2 years 10 months 20 days	2 years 10 months 20 days
Risk-free interest rate	4.18%	4.41%	3.95%
Expected dividend yield	0.00%	0.00%	0.00%

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Correlation Coefficient

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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