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Defined Contribution Plans - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Contributions to defined contribution plans |  | $ 1.9 | $ 1.7 | $ 1.1
U.S. [Member] | 401 (K) Retirement and Savings Plan [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Percentage of employee contributions, eligible for employer match | 6.00% |  |  |
Percentage of employee contributions | 3.00% | 4.00% |  |
Ireland [Member] | Defined Contribution PRSA Plan [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Percentage of employee contributions, eligible for employer match |  | 6.00% |  |
Percentage of employee contributions |  | 8.00% |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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