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v3.25.3

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
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Deferred Tax Assets, Net [Abstract] |  |  |  |
Net operating loss carryforwards | $ 12,074 | $ 14,141 |  |
Foreign tax credits | 5,996 | 2,028 |  |
Capitalized research and development | 176,610 | 136,001 |  |
Pension benefits | 6,868 | 7,629 |  |
Prepaid expenses | 22,391 | 18,551 |  |
Deferred revenue | 2,970 | 2,607 |  |
Stock-based compensation | 23,514 | 22,231 |  |
Other reserves not currently deductible | 39,888 | 34,422 |  |
Amortization of intangible assets | 36,560 | 60,527 |  |
Research and development and other tax credits | 8,984 | 25,706 |  |
Lease liabilities | 43,650 | 46,460 |  |
Fixed assets | 114,109 | 106,741 |  |
Capital loss carryforward | 4,517 | 3,875 |  |
Other | 5,608 | 3,528 |  |
Gross deferred tax assets | 503,739 | 484,447 |  |
Valuation allowance | (8,529) | (21,755) | $ (21,695) | $ (22,283)
Total deferred tax assets | 495,210 | 462,692 |  |
Deferred Tax Liabilities, Net [Abstract] |  |  |  |
Acquired intangible assets not deductible | (246,107) | (257,731) |  |
Lease assets | (29,298) | (34,160) |  |
Pension prepayments | (4,279) | (3,283) |  |
Deferred revenue | (10,212) | (1,243) |  |
Depreciation | (3,277) | (4,683) |  |
Deferred income | (14,518) | (11,636) |  |
Prepaid commissions | (14,479) | (13,738) |  |
Other | (9,120) | (9,030) |  |
Total deferred tax liabilities | (331,290) | (335,504) |  |
Net deferred tax assets | $ 163,920 | $ 127,188 |  |

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