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Income Taxes (Tables) | 12 Months Ended
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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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