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COMMITMENTS AND CONTINGENCIES	9 Months Ended
COMMITMENTS AND CONTINGENCIES	Aug. 02, 2025
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Tax Contingencies Ciena is subject to various tax contingencies arising in the ordinary course of business. Ciena does not expect that the ultimate settlement of these contingencies will have a material effect on its financial position or cash flows. Litigation Ciena is subject to various legal proceedings, claims, and other matters arising in the ordinary course of business, including those that relate to employment, commercial, tax, and other regulatory matters. Ciena is also subject to intellectual property related claims, including claims against third parties that may involve contractual indemnification obligations on the part of Ciena. Ciena does not expect that the ultimate costs to resolve such matters will have a material effect on its results of operations, financial position, or cash flows. Purchase Obligations Ciena has certain advanced commitments for supply of certain long lead time components. As of August 2, 2025, Ciena had $1.8 billion in outstanding purchase commitments to contract manufacturers and component suppliers for inventory. In certain instances, Ciena is permitted to cancel, reschedule or adjust these commitments. Consequently, only a portion of this amount relates to firm, non-cancelable and unconditional obligations.