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INCOME TAXES
 3 Months Ended
Feb. 01, 2025
Income Tax Disclosure [Abstract]  
INCOME TAXES INCOME TAXES
The effective tax rate for the first quarter of fiscal 2025 was higher than the effective tax rate for the first quarter of fiscal 2024. The increase was primarily due to income in jurisdictions with higher tax rates.

For the three months ended February 1, 2025, the impact of the 15% global minimum tax, referred to as Pillar Two, was not material to the consolidated financial statements. Ciena is continuing to monitor and evaluate legislative developments related to Pillar Two and to the extent additional legislative changes take place in the countries in which Ciena operates, it is possible that these changes may yield an adverse impact on the effective tax rate.