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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Taxes [Line Items] |  |  |  |
Foreign pretax earnings | $ 150,800 | $ 172,700 | $ 136,000 |
Current foreign tax expense related to foreign tax withholdings | 14,600 | 12,300 | 9,500 |
Unrecognized tax benefits | 19,879 | $ 13,849 | $ 12,980 | $ 10,897
Unrecognized tax benefits that would impact the effective tax rate if recognized | 18,600 |  |  |
Unrecognized tax benefits, accrued interest | $ 1,700 |  |  |
Effective income tax rate | 21.00% |  |  |
Unremitted earnings of foreign subsidiaries | $ 82,600 |  |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings | 2,800 |  |  |
U.S. Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | 2,800 |  |  |
California Franchise Tax Board | Research Tax Credit Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Excess state research credit | $ 7,100 |  |  |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiary and other recognized entity not within country of domicile. Includes, but is not limited to, other basis differences. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.1.Q1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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