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SIGNIFICANT ACCOUNTING POLICIES (Policies)
 6 Months Ended
May 02, 2026
Accounting Policies [Abstract]  
Accounting Standards - Not Yet Effective
Accounting Standards - Not Yet Effective

In December 2023, the FASB issued ASU No. 2023-09 (“ASU 2023-09”), Income Taxes (Topic 740): Improvement to Income Tax Disclosures, to enhance the transparency and decision usefulness of income tax disclosures to decision makers. ASU 2023-09 is effective for annual periods beginning after December 15, 2024, and will result in changes to certain income tax disclosures including substantially more information on a disaggregated basis, but it does not affect recognition or measurement of income taxes and therefore is not expected to have a material effect on our consolidated financial statements. The amendments are applied on a prospective basis; however, retrospective application is permitted.

In November 2024, the FASB issued ASU No. 2024-03 (“ASU 2024-03”), Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40), to improve financial reporting by requiring that public business entities disclose additional information about specific expense categories in the notes to financial statements at interim and annual reporting periods. ASU 2024-03 is effective for annual periods beginning after December 15, 2026 and interim reporting periods beginning after December 15, 2027; however, early adoption is permitted. ASU 2024-03 allows for adoption using either a prospective or retrospective method. Ciena is currently evaluating the impact of this ASU on its consolidated financial statements and related disclosures.
In July 2025, the FASB issued ASU No. 2025-05 (“ASU 2025-05”), Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets, to introduce a practical expedient for all entities, which simplifies the calculation required for estimating credit losses and assumes that current conditions as of the balance sheet date do not change for the remaining life of the asset. ASU 2025-05 is effective for annual reporting periods beginning after December 15, 2025 and interim reporting periods within those annual reporting periods; however, early adoption is permitted. ASU 2025-05 allows for adoption using a prospective method. Ciena is currently evaluating the impact of this ASU on its consolidated financial statements and related disclosures.

In September 2025, the FASB issued ASU No. 2025-06 (“ASU 2025-06”), Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) to modernize the accounting for software costs that are accounted for under Subtopic 350-40 by shifting away from prescriptive and sequential software development stages to an incremental and iterative method when capitalizing software costs. ASU 2025-06 is effective for annual reporting periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period. Ciena is currently evaluating the impact of this ASU on its consolidated financial statements and related disclosures.

In December 2025, the FASB issued ASU No. 2025-11 (“ASU 2025-11”), Interim Reporting (Topic 270): Narrow-Scope Improvements, to improve the navigability of required interim disclosures, clarify when that guidance applies, and provide additional guidance on what disclosures should be provided in interim reporting periods. ASU 2025-11 is effective for interim reporting periods with annual reporting periods beginning after December 15, 2027; however, early adoption is permitted. ASU 2025-11 allows for adoption using the prospective or retrospective method. Ciena is currently evaluating the impact of this ASU on its interim financial statements and related disclosures.
In May 2026, the FASB issued ASU No. 2026-02 (“ASU 2026-02”), Environmental Credits and Environmental Credit Obligations, to clarify the accounting treatment and reporting standards of environmental credits and environmental credit obligations. ASU 2026-02 is effective for annual reporting periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period and should be applied on a retrospective basis. Ciena is currently evaluating the impact of this ASU on its consolidated financial statements and related disclosures.
Segment Reporting Operating segments are defined as components of an enterprise that engage in business activities that earn revenue and incur expense for which discrete financial information is available, and for which such information is evaluated regularly by the chief operating decision maker (“CODM”) for purposes of allocating resources and assessing performance. Ciena has the following operating segments for reporting purposes: (i) Networking Platforms; (ii) Platform Software and Services; (iii) Blue Planet Automation Software and Services; and (iv) Global Services. Ciena’s CODM is its Chief Executive Officer, Gary Smith, who evaluates Ciena’s performance and allocates resources based on segment profit (loss) as compared to annual targets for these four operating segments.