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INCOME TAXES (Tables)

12 Months Ended

Nov. 01, 2025

Income Tax Disclosure [Abstract]

Schedule of Provision for Income Taxes

For the periods indicated, the provision for income taxes consists of the following (in thousands):

			Year Ended
			November 1, 2025						November 2, 2024						October 28, 2023
Provision for income taxes:
Current:
Federal			$	14,881					$	70,208					$	36,537
State			4,208						14,106						18,860
Foreign			37,034						28,390						28,281
Total current			56,123						112,704						83,678
Deferred:
Federal			(36,359)						(52,300)						(8,010)
State			13,643						(4,868)						(17,354)
Foreign			(458)						(19,642)						10,512
Total deferred			(23,174)						(76,810)						(14,852)
Provision for income taxes			$	32,949					$	35,894					$	68,826

Schedule of Income before Provision for Income Taxes

For the periods indicated, income before provision for income taxes consists of the following (in thousands):

			Year Ended
			November 1, 2025						November 2, 2024						October 28, 2023
United States			$	(22,804)					$	244					$	93,682
Foreign			179,091						119,606						229,971
Total			$	156,287					$	119,850					$	323,653

Schedule of Tax Provision (Benefit) Reconciles to the Amount Computed by Multiplying Income or Loss Before Income Taxes by the U.S. Federal Statutory Rate of 21%

For the periods indicated, the tax provision reconciles to the amount computed by multiplying income before income taxes by the U.S. federal statutory rate of 21% for fiscal 2025, fiscal 2024 and fiscal 2023 as follows:

			Year Ended
			November 1, 2025						November 2, 2024						October 28, 2023
Provision at statutory rate			21.00		%				21.00		%				21.00		%
State taxes			1.03		%				5.60		%				1.65		%
Withholding and other foreign taxes			5.87		%				3.53		%				(0.09)		%
Research and development credit			(34.10)		%				(40.23)		%				(16.78)		%
Non-deductible compensation			10.04		%				13.92		%				5.29		%
U.S. Taxation on foreign activity			1.20		%				9.59		%				5.08		%
Foreign Nontaxable interest			0.01		%				(2.96)		%				(1.06)		%
Taxation on foreign inflation			0.41		%				3.03		%				1.34		%
Rate change			7.58		%				4.46		%				(3.71)		%
Valuation allowance			14.08		%				2.15		%				9.44		%
Loss on equity transactions			—		%				—		%				(1.72)		%
Uncertain tax positions			(4.65)		%				8.09		%				1.72		%
Other			(1.39)		%				1.77		%				(0.89)		%
Effective income tax rate			21.08		%				29.95		%				21.27		%

Schedule of Significant Components of Deferred Tax Assets and Liabilities

The significant components of deferred tax assets are as follows (in thousands):

			Year Ended
			November 1, 2025						November 2, 2024
Deferred tax assets:
Reserves and accrued liabilities			$	76,148					$	79,272
Depreciation and amortization			734,427						760,685
NOL and credit carry forward			243,193						211,792
Other			45,109						26,574
Gross deferred tax assets			1,098,877						1,078,323
Valuation allowance			(214,456)						(192,447)
Deferred tax asset, net of valuation allowance			$	884,421					$	885,876

Schedule of Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits, excluding Interest and Penalties

A reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest and penalties, is as follows (in thousands):

			Amount
Unrecognized tax benefits at October 29, 2022			$	80,514
Increase related to positions taken in prior period			9,940
Reductions related to settlements with taxing authorities			(625)
Increase related to positions taken in current period			4,960
Reductions related to expiration of statute of limitations			(869)
Unrecognized tax benefits at October 28, 2023			93,920
Increase related to positions taken in prior period			11,482
Reductions related to settlements with taxing authorities			(4,345)
Increase related to positions taken in current period			4,340
Reductions related to expiration of statute of limitations			(116)
Unrecognized tax benefits at November 2, 2024			105,281
Increase related to positions taken in prior period			6,771
Reductions related to settlements with taxing authorities			(234)
Increase related to positions taken in current period			5,463
Reductions related to expiration of statute of limitations			(21,596)
Unrecognized tax benefits at November 1, 2025			$	95,685

Schedule of Valuation Allowance Against the Gross Deferred Tax Assets

The following table summarizes the activity in Ciena’s valuation allowance against its gross deferred tax assets (in thousands):

Year Ended						Beginning Balance						Additions						Deductions						Ending Balance
October 28, 2023						$	162,076					$	28,746					$	952					$	189,870
November 2, 2024						$	189,870					$	16,816					$	14,239					$	192,447
November 1, 2025						$	192,447					$	22,702					$	693					$	214,456

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure of the change in unrecognized tax benefits.

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Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance.

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