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v3.23.3

Available-for-Sale Securities - Interest-bearing Investments in Available-for-Sale Securities (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities | $ 530,805 | $ 510,965
Short Term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity period of Available-for-sale securities | longer than 90 days | longer than 90 days
Available-for-sale securities | $ 222,451 | $ 244,603
Cash and Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity period of Available-for-sale securities | 90 days or less | 90 days or less
Available-for-sale securities | $ 308,354 | $ 266,362

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