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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, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Reconciliation, Amount |  |  |  |
Statutory federal income tax rate |  | $ 69,839 | $ 83,391 | $ 82,268
Change in valuation allowance |  | 0 | 0 | (134,695)
State income taxes, net of federal tax benefit |  | 577 | 6,518 | (28,768)
Federal research and development credits |  | (7,751) | (7,477) | (5,764)
Uncertain tax positions |  | 23,302 | 2,418 | 3,398
Foreign tax credit |  | (11,415) | (9,078) | (35,368)
Foreign rate differences |  | (20,829) | (8,982) | (34,584)
Foreign tax on U.S. provision |  | 11,415 | 9,078 | 5,931
Excess tax benefits from restricted stock |  | (6,963) | (8,278) | (6,141)
Audits and settlements |  | 0 | 0 | 33,370
U.S. permanent items |  | 5,341 | 3,453 | 7,449
Non-deductible compensation |  | 8,344 | 11,851 | 10,940
Base Erosion Anti-Abuse Tax (BEAT) |  | 0 | 0 | 2,936
GILTI, net of foreign tax credits |  | 17,861 | 2,705 | 18,217
Foreign-Derived Intangible Income (FDII) |  | (8,987) | (6,848) | (4,428)
Non-deductible imputed interest |  | 6,292 | 0 | 0
Other, net |  | 0 | (1,578) | 71
Provision (benefit) for income taxes |  | $ 87,026 | $ 84,017 | $ (85,168)
Reconciliation, Percent |  |  |  |
Statutory federal income tax rate |  | 21.00% | 21.00% | 21.00%
Change in valuation allowance |  | 0.00% | 0.00% | (34.00%)
State income taxes, net of federal tax benefit |  | 0.00% | 2.00% | (8.00%)
Federal research and development credits |  | (2.00%) | (2.00%) | (2.00%)
Uncertain tax positions |  | 7.00% | 1.00% | 1.00%
Foreign tax credit |  | (3.00%) | (2.00%) | (9.00%)
Foreign rate differences |  | (6.00%) | (2.00%) | (9.00%)
Foreign tax on U.S. provision |  | 3.00% | 2.00% | 2.00%
Excess tax benefits from restricted stock |  | (2.00%) | (2.00%) | (2.00%)
Audits and settlements |  | 0.00% | 0.00% | 9.00%
U.S. permanent items |  | 2.00% | 0.00% | 2.00%
Non-deductible compensation |  | 3.00% | 3.00% | 3.00%
Base Erosion Anti-Abuse Tax (BEAT) |  | 0.00% | 0.00% | 1.00%
GILTI, net of foreign tax credits |  | 5.00% | 1.00% | 4.00%
Foreign-Derived Intangible Income (FDII) |  | (3.00%) | (2.00%) | (1.00%)
Non-deductible imputed interest |  | 2.00% | 0.00% | 0.00%
Other, net |  | (1.00%) | (1.00%) | 0.00%
Provision (benefit) for income taxes |  | 26.00% | 21.00% | (22.00%)
PLM Services Business Disposition |  |  |  |
Reconciliation, Amount |  |  |  |
Sale of a portion of the PLM services business | $ 60,400 | $ 0 | $ 6,844 | $ 0
Reconciliation, Percent |  |  |  |
Sale of a portion of the PLM services business |  | 0.00% | 2.00% | 0.00%

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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