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INCOME TAXES (Tables)

12 Months Ended

Nov. 02, 2024

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 2, 2024						October 28, 2023						October 29, 2022
Provision for income taxes:
Current:
Federal			$	70,208					$	36,537					$	27,479
State			14,106						18,860						10,289
Foreign			28,390						28,281						19,337
Total current			112,704						83,678						57,105
Deferred:
Federal			(52,300)						(8,010)						(30,032)
State			(4,868)						(17,354)						520
Foreign			(19,642)						10,512						2,010
Total deferred			(76,810)						(14,852)						(27,502)
Provision for income taxes			$	35,894					$	68,826					$	29,603

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 2, 2024						October 28, 2023						October 29, 2022
United States			$	244					$	93,682					$	28,784
Foreign			119,606						229,971						153,721
Total			$	119,850					$	323,653					$	182,505

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 2024, fiscal 2023 and fiscal 2022 as follows:

			Year Ended
			November 2, 2024						October 28, 2023						October 29, 2022
Provision at statutory rate			21.00		%				21.00		%				21.00		%
State taxes			5.60		%				1.65		%				2.31		%
Withholding and other foreign taxes			3.53		%				(0.09)		%				(1.37)		%
Research and development credit			(40.23)		%				(16.78)		%				(23.66)		%
Non-deductible compensation			13.92		%				5.29		%				5.26		%
U.S. Taxation on foreign activity			9.59		%				5.08		%				1.73		%
Foreign Nontaxable interest			(2.96)		%				(1.06)		%				(1.90)		%
Taxation on foreign inflation			3.03		%				1.34		%				1.41		%
Rate change			4.46		%				(3.71)		%				1.27		%
Valuation allowance			2.15		%				9.44		%				8.35		%
Loss on equity transactions			—		%				(1.72)		%				—		%
Uncertain tax positions			8.09		%				1.72		%				1.62		%
Other			1.77		%				(0.89)		%				0.20		%
Effective income tax rate			29.95		%				21.27		%				16.22		%

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 2, 2024						October 28, 2023
Deferred tax assets:
Reserves and accrued liabilities			$	79,272					$	82,160
Depreciation and amortization			760,685						712,098
NOL and credit carry forward			211,792						197,984
Other			26,574						6,934
Gross deferred tax assets			1,078,323						999,176
Valuation allowance			(192,447)						(189,870)
Deferred tax asset, net of valuation allowance			$	885,876					$	809,306

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 30, 2021			$	77,091
Increase related to positions taken in prior period			4,732
Reductions related to settlements with taxing authorities			(3,229)
Increase related to positions taken in current period			2,959
Reductions related to expiration of statute of limitations			(1,039)
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

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 29, 2022						$	159,634					$	15,245					$	12,803					$	162,076
October 28, 2023						$	162,076					$	28,746					$	952					$	189,870
November 2, 2024						$	189,870					$	16,816					$	14,239					$	192,447

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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 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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