REVENUE - Geographical Distribution of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 02, 2025	Jul. 27, 2024	Aug. 02, 2025	Jul. 27, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,219,385	$ 942,308	$ 3,417,523	$ 2,890,843
Americas
Disaggregation of Revenue [Line Items]
Total revenue	923,627	718,605	2,553,081	2,099,680
EMEA
Disaggregation of Revenue [Line Items]
Total revenue	186,018	135,009	535,519	498,212
APAC
Disaggregation of Revenue [Line Items]
Total revenue	$ 109,740	$ 88,694	$ 328,923	$ 292,951

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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+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

CIENA CORP 10-Q