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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2023
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,
|  | 2023 |  | 2022 |  | 2021
United States |  | $ | 268,314 |  |  | $ | 217,323 |  |  | $ | 189,398 |
International |  | 217,674 |  |  | 168,070 |  |  | 197,539 |
|  | $ | 485,988 |  |  | $ | 385,393 |  |  | $ | 386,937 |
Schedule Of Provision For Income Taxes (Benefit) | The provision for income taxes consists of the following (in thousands):
|  | Years Ended September 30,
|  | 2023 |  | 2022 |  | 2021
Current |  |  |  |  |  |
U.S. federal |  | $ | 115,170 |  |  | $ | 35,259 |  |  | $ | 53,107 |
State |  | 18,359 |  |  | 14,592 |  |  | 16,686 |
Foreign |  | 66,053 |  |  | 54,079 |  |  | 62,832 |
Total |  | 199,582 |  |  | 103,930 |  |  | 132,625 |
Deferred |  |  |  |  |  |
U.S. federal |  | (89,280) |  |  | (28,721) |  |  | (61,739) |
State |  | (18,576) |  |  | (11,332) |  |  | (15,294) |
Foreign |  | (686) |  |  | (644) |  |  | 104 |
Total |  | (108,542) |  |  | (40,697) |  |  | (76,929) |
|  | $ | 91,040 |  |  | $ | 63,233 |  |  | $ | 55,696 |
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,
|  | 2023 |  | 2022 |  | 2021
Income tax provision at statutory rate |  | $ | 102,058 |  |  | $ | 80,933 |  |  | $ | 81,257 |
State taxes, net of federal benefit |  | 6,806 |  |  | 6,012 |  |  | 5,118 |
Tax impact of foreign operations |  | (20,230) |  |  | (21,435) |  |  | (26,881) |
Research and development and other credits |  | (19,198) |  |  | (18,917) |  |  | (18,055) |
Stock-based and other compensation |  | 20,145 |  |  | 15,070 |  |  | 12,740 |
Other |  | 1,459 |  |  | 1,570 |  |  | 1,517 |
|  | $ | 91,040 |  |  | $ | 63,233 |  |  | $ | 55,696 |
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,
|  | 2023 |  | 2022
Deferred tax assets |  |  |  |
Net operating loss carry-forwards |  | $ | 40,201 |  |  | $ | 42,849 |
Capitalized research and development costs |  | 267,744 |  |  | 158,206 |
Accrued compensation and benefits |  | 11,995 |  |  | 14,068 |
Stock-based compensation |  | 8,875 |  |  | 10,389 |
Deferred revenue |  | 42,544 |  |  | 32,244 |
Lease liabilities |  | 62,405 |  |  | 67,520 |
Other accruals and reserves |  | 22,723 |  |  | 18,797 |
Tax credit carryforwards |  | 23,883 |  |  | 28,858 |
Depreciation |  | 531 |  |  | 505 |
|  | 480,901 |  |  | 373,436 |
Valuation allowance |  | (43,942) |  |  | (46,136) |
|  | 436,959 |  |  | 327,300 |
Deferred tax liabilities |  |  |  |
Purchased intangibles |  | (55,519) |  |  | (57,350) |
Depreciation |  | (28,113) |  |  | (22,278) |
Deferred costs |  | (11,031) |  |  | (12,987) |
Lease assets |  | (41,709) |  |  | (45,948) |
Other accruals and reserves |  | (9,916) |  |  | (8,153) |
|  | (146,288) |  |  | (146,716) |
Net deferred tax assets |  | $ | 290,671 |  |  | $ | 180,584 |
Schedule Of Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits | The following table provides a reconciliation of the beginning and ending amount of unrecognized tax benefits in fiscal years 2023, 2022 and 2021 (in thousands):
|  | 2023 |  | 2022 |  | 2021
Balance, beginning of period |  | $ | 66,840 |  |  | $ | 70,814 |  |  | $ | 51,767 |
Gross increases related to prior period tax positions |  | 4,270 |  |  | 4,816 |  |  | 14,867 |
Gross decreases related to prior period tax positions |  | (70) |  |  | (10,538) |  |  | — |
Gross increases related to current period tax positions |  | 9,224 |  |  | 10,203 |  |  | 12,595 |
Decreases relating to settlements with tax authorities |  | (300) |  |  | — |  |  | (321) |
Reductions due to lapses of statute of limitations |  | (797) |  |  | (8,455) |  |  | (8,094) |
Balance, end of period |  | $ | 79,167 |  |  | $ | 66,840 |  |  | $ | 70,814 |

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