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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Disclosure [Line Items] |  |  |  |
U.S. federal statutory tax rate |  |  | 21.00% |
Excess tax benefits related to stock based compensation expense |  | $ 100,000 | $ 200,000 | $ 900,000
Deferred tax asset valuation allowance | $ 17,672,000 | 22,005,000 | 17,672,000 |
Valuation allowance change | 10,200,000 |  |  |
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate | 2,500,000 | 3,100,000 | 2,500,000 |
Accrued interest and penalties on unrecognized tax benefits | 300,000 | 500,000 | 300,000 |
Undistributed earnings in foreign subsidiaries | $ 0 | $ 0 | $ 0 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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