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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Income Taxes [Line Items] |  |  |  |
Foreign pretax earnings | $ 144,500 | $ 150,800 | $ 172,700 |
Current foreign tax expense related to foreign tax withholdings | 15,600 | 14,600 | 12,300 |
Unremitted earnings of foreign subsidiaries | 94,600 |  |  |
Deferred tax liabilities, undistributed foreign earnings | 3,200 |  |  |
Unrecognized tax benefits | 19,505 | $ 19,879 | $ 13,849 | $ 12,980
Unrecognized tax benefits that would impact the effective tax rate if recognized | 18,000 |  |  |
Unrecognized tax benefits, accrued interest | 1,900 |  |  |
U.S. Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | 1,300 |  |  |
California Franchise Tax Board | Research Tax Credit Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Excess state research credit | $ 6,600 |  |  |

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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 The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-10A Reference 3: 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)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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