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INCOME TAXES
 9 Months Ended
Aug. 02, 2025
Income Tax Disclosure [Abstract]  
INCOME TAXES INCOME TAXES
The effective tax rate for the third quarter of fiscal 2025 was higher than the effective tax rate for the third quarter of fiscal 2024, primarily due to the settlement of uncertain tax positions in the prior year.

The effective tax rate for the first nine months of fiscal 2025 was lower than the effective tax rate for the first nine months of fiscal 2024, primarily due to an income tax benefit for share-based compensation expense.

For the nine months ended August 2, 2025, the impact of the 15% global minimum tax, referred to as Pillar Two, was not material to Ciena’s consolidated financial statements.
On July 4, 2025, the One Big Beautiful Bill Act (“OBBBA”) was enacted into law in the United States. The OBBBA includes significant provisions, such as the permanent extension of certain expiring provisions of the Tax Cuts and Jobs Act, modifications to the international tax framework and the restoration of favorable tax treatment for certain business provisions. The legislation has multiple effective dates, with certain provisions taking effect in fiscal 2025 and others to be implemented through fiscal 2027. The legislation will not have a material impact on Ciena’s consolidated financial statements in fiscal 2025.