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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2020
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Equity [Abstract] |  |  |
Treasury stock, shares | 7,267,021 | 7,267,021 |
Shares approved to repurchase |  |  | 10,000,000
Aggregate purchase price | $ 148.7 |  |
Remaining shares available for future purchases under share repurchase program | 8,900,000 |  |

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