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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Income Taxes [Line Items] |  |  |  |
Foreign pretax earnings | $ 172,700 | $ 136,000 | $ 62,100 |
Current foreign tax expense related to foreign tax withholdings | 12,300 | 9,500 | 7,500 |
Valuation allowance | 2,200 |  |  |
Unrecognized tax benefits | 13,849 | $ 12,980 | $ 10,897 | $ 7,994
Unrecognized tax benefits that would impact the effective tax rate if recognized | 12,700 |  |  |
Unrecognized tax benefits, accrued interest | $ 900 |  |  |
Effective income tax rate | 21.00% |  |  |
Unremitted earnings of foreign subsidiaries | $ 27,200 |  |  |
U.S. Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | 4,100 |  |  |
Foreign NOL carryforwards |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | 2,200 |  |  |
California Franchise Tax Board | Research Tax Credit Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Excess state research credit | $ 9,200 |  |  |

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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 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 Reference 2: 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 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.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + 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 S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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