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Income Taxes - Summary of Federal Income Tax Rate and Effective Income Tax Rate (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 01, 2022 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Reconciliation, Amount |  |  |  |
Statutory federal income tax rate |  | $ 193,237 | $ 98,482 | $ 69,839
State income taxes, net of federal tax benefit |  | 6,124 | 4,631 | 577
Federal research and development credits |  | (8,552) | (11,203) | (7,751)
Uncertain tax positions |  | (1,904) | 7,268 | 23,302
Foreign tax credit |  | (14,410) | (30,119) | (11,415)
Foreign rate differences |  | (12,135) | (15,368) | (20,829)
Foreign tax on U.S. provision |  | 14,452 | 15,120 | 11,415
Excess tax benefits from restricted stock |  | (8,534) | (9,225) | (6,963)
U.S. permanent items |  | (920) | 2,711 | 5,341
Non-deductible compensation |  | 9,096 | 10,157 | 8,344
Base Erosion Anti-Abuse Tax (BEAT) |  | 2,653 | 3,264 | 0
GILTI, net of foreign tax credits |  | 27,008 | 31,388 | 17,861
Foreign-Derived Intangible Income (FDII) |  | (20,162) | (15,148) | (8,987)
Non-deductible imputed interest |  | 0 | 0 | 6,292
Other, net |  | 227 | 671 | 0
Provision for income taxes |  | $ 186,180 | $ 92,629 | $ 87,026
Reconciliation, Percent |  |  |  |
Statutory federal income tax rate |  | 21.00% | 21.00% | 21.00%
State income taxes, net of federal tax benefit |  | 1.00% | 1.00% | 0.00%
Federal research and development credits |  | (1.00%) | (2.00%) | (2.00%)
Uncertain tax positions |  | 0.00% | 2.00% | 7.00%
Foreign tax credit |  | (2.00%) | (7.00%) | (3.00%)
Foreign rate differences |  | (1.00%) | (3.00%) | (6.00%)
Foreign tax on U.S. provision |  | 2.00% | 3.00% | 3.00%
Excess tax benefits from restricted stock |  | (1.00%) | (2.00%) | (2.00%)
U.S. permanent items |  | 0.00% | 0.00% | 2.00%
Non-deductible compensation |  | 1.00% | 2.00% | 3.00%
Base Erosion Anti-Abuse Tax (BEAT) |  | 0.00% | 1.00% | 0.00%
GILTI, net of foreign tax credits |  | 3.00% | 7.00% | 5.00%
Foreign-Derived Intangible Income (FDII) |  | (2.00%) | (3.00%) | (3.00%)
Non-deductible imputed interest |  | 0.00% | 0.00% | 2.00%
Other, net |  | (1.00%) | 0.00% | (1.00%)
Provision for income taxes |  | 20.00% | 20.00% | 26.00%
PLM Services Business Disposition |  |  |  |
Reconciliation, Amount |  |  |  |
Sale of a portion of the PLM services business | $ 60,400 |  |  |

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