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Income Taxes (Tables)

12 Months Ended

Sep. 30, 2025

Income Tax Disclosure [Abstract]

Components Of Income Before Income Taxes

The United States and international components of income before income taxes are as follows (in thousands):

						Years Ended September 30,
						2025						2024						2023
United States						$	547,633					$	430,532					$	268,314
International						260,703						264,933						217,674
						$	808,336					$	695,465					$	485,988

Schedule Of Provision For Income Taxes (Benefit)

The provision for income taxes consists of the following (in thousands):

						Years Ended September 30,
						2025						2024						2023
Current
U.S. federal						$	90,560					$	99,745					$	115,170
State						20,937						17,957						18,359
Foreign						77,008						79,200						66,053
Total						188,505						196,902						199,582
Deferred
U.S. federal						(45,160)						(51,968)						(89,280)
State						(10,476)						(11,100)						(18,576)
Foreign						(16,913)						(5,147)						(686)
Total						(72,549)						(68,215)						(108,542)
						$	115,956					$	128,687					$	91,040

Schedule Of Effective Tax Rate Differs From The U.S. Federal Statutory Rate

The effective tax rate differs from the U.S. federal statutory rate as follows (in thousands):

						Years Ended September 30,
						2025						2024						2023
Income tax provision at statutory rate						$	169,750					$	146,048					$	102,058
State taxes, net of federal benefit						11,724						10,548						6,806
Foreign-derived intangible income deduction						(32,192)						(28,036)						(30,086)
Tax impact of foreign earnings						(9,922)						7,359						9,856
Research and development and other credits						(24,467)						(14,748)						(17,654)
Stock-based and other compensation						(2,635)						8,145						20,145
Other						3,698						(629)						(85)
						$	115,956					$	128,687					$	91,040

Schedule Of Tax Effects To Deferred Tax Assets And Liabilities

The tax effects of the temporary differences that give rise to the deferred tax assets and liabilities are as follows (in thousands):

						Years Ended September 30,
						2025						2024
Deferred tax assets
Net operating loss carry-forwards						$	47,028					$	34,787
Capitalized research and development costs						417,392						337,626
Accrued compensation and benefits						14,444						13,493
Stock-based compensation						9,933						8,606
Deferred revenue						31,341						39,042
Lease liabilities						56,282						53,945
Other accruals and reserves						28,191						28,729
Tax credit carryforwards						27,398						25,052
Depreciation						1,759						1,507
						633,768						542,787
Valuation allowance						(34,281)						(39,651)
						599,487						503,136
Deferred tax liabilities
Purchased intangibles						(59,096)						(53,047)
Depreciation						(32,269)						(29,441)
Deferred costs						(11,728)						(10,752)
Lease assets						(36,629)						(36,610)
Other accruals and reserves						(15,298)						(14,514)
						(155,020)						(144,364)
Net deferred tax assets						$	444,467					$	358,772

Schedule of Unrecognized Tax Benefits Roll Forward

The following table provides a reconciliation of the beginning and ending amount of unrecognized tax benefits in fiscal years 2025, 2024 and 2023 (in thousands):

						2025						2024						2023
Balance, beginning of period						$	86,877					$	79,167					$	66,840
Gross increases related to prior period tax positions						5,292						7,939						4,270
Gross decreases related to prior period tax positions						(2,381)						(7,659)						(70)
Gross increases related to current period tax positions						10,244						8,494						9,224
Decreases relating to settlements with tax authorities						—						(50)						(300)
Reductions due to lapses of statute of limitations						(13,435)						(1,014)						(797)
Balance, end of period						$	86,597					$	86,877					$	79,167

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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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