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INCOME TAXES
 9 Months Ended
Jul. 31, 2021
Income Tax Disclosure [Abstract]  
INCOME TAXES INCOME TAXESThe effective tax rate for the quarter and nine months ended July 31, 2021 was lower than the effective tax rate for the quarter and nine months ended August 1, 2020, primarily due to the tax benefit associated with recording a deferred tax asset.
To accommodate the requirements of a global business, Ciena has begun reorganizing its global supply chain and distribution structure, which includes a legal entity reorganization and related system upgrade. During the quarter, Ciena completed an internal transfer of certain of its non-U.S. intangible assets, which created amortizable tax basis resulting in the discrete recognition of a $124.2 million deferred tax asset with a corresponding tax benefit. The impact of this transfer is reflected in Ciena’s effective tax rate for the quarter and nine months ended July 31, 2021, which had a significant, one-time impact on its net income for these periods.

Ciena’s future income tax provisions and deferred tax balances may be affected by the amount of pre-tax income, the jurisdictions where it is earned, the existence and ability to utilize tax attributes and changes in tax laws and business reorganizations. Ciena continues to monitor these items and will adopt strategies to address their impact as appropriate.