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Dividends - Summary of Dividends Declared by Board of directors (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Dividends Payable [Line Items] |  |  |
Dividends Per Ordinary Share | $ 1.7 | $ 1.545 | $ 1.4075
Declaration Date, August 2, 2023 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date | Aug. 02, 2023 |  |
Record Date | Sep. 29, 2023 |  |
Payment Date | Oct. 27, 2023 |  |
Dividends Per Ordinary Share | $ 0.435 |  |
Total Amount | $ 51,053 |  |
Declaration Date, May 10, 2023 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date | May 10, 2023 |  |
Record Date | Jun. 30, 2023 |  |
Payment Date | Jul. 28, 2023 |  |
Dividends Per Ordinary Share | $ 0.435 |  |
Total Amount | $ 51,781 |  |
Declaration Date, August 3, 2022 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | Aug. 03, 2022 |
Record Date |  | Sep. 30, 2022 |
Payment Date |  | Oct. 28, 2022 |
Dividends Per Ordinary Share |  | $ 0.395 |
Total Amount |  | $ 47,735 |
Declaration Date, May 11, 2022 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | May 11, 2022 |
Record Date |  | Jun. 30, 2022 |
Payment Date |  | Jul. 29, 2022 |
Dividends Per Ordinary Share |  | $ 0.395 |
Total Amount |  | $ 48,180 |
Declaration Date, January 31, 2023 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date | Jan. 31, 2023 |  |
Record Date | Mar. 31, 2023 |  |
Payment Date | Apr. 28, 2023 |  |
Dividends Per Ordinary Share | $ 0.435 |  |
Total Amount | $ 52,309 |  |
Declaration Date, November 8, 2022 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date | Nov. 08, 2022 |  |
Record Date | Dec. 30, 2022 |  |
Payment Date | Jan. 27, 2023 |  |
Dividends Per Ordinary Share | $ 0.395 |  |
Total Amount | $ 47,635 |  |
Declaration Date, February 1, 2022 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | Feb. 01, 2022 |
Record Date |  | Mar. 31, 2022 |
Payment Date |  | Apr. 29, 2022 |
Dividends Per Ordinary Share |  | $ 0.395 |
Total Amount |  | $ 48,527 |
Declaration Date, November 2, 2021 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | Nov. 02, 2021 |
Record Date |  | Dec. 31, 2021 |
Payment Date |  | Jan. 28, 2022 |
Dividends Per Ordinary Share |  | $ 0.36 |
Total Amount |  | $ 44,410 |
Declaration Date, August 4, 2021 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | Aug. 04, 2021
Record Date |  |  | Sep. 30, 2021
Payment Date |  |  | Oct. 29, 2021
Dividends Per Ordinary Share |  |  | $ 0.36
Total Amount |  |  | $ 44,956
Declaration Date, May 12, 2021 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | May 12, 2021
Record Date |  |  | Jun. 30, 2021
Payment Date |  |  | Jul. 23, 2021
Dividends Per Ordinary Share |  |  | $ 0.36
Total Amount |  |  | $ 45,580
Declaration Date, February 2, 2021 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | Feb. 02, 2021
Record Date |  |  | Mar. 31, 2021
Payment Date |  |  | Apr. 23, 2021
Dividends Per Ordinary Share |  |  | $ 0.36
Total Amount |  |  | $ 45,958
Declaration Date, November 10, 2020 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | Nov. 10, 2020
Record Date |  |  | Dec. 31, 2020
Payment Date |  |  | Jan. 22, 2021
Dividends Per Ordinary Share |  |  | $ 0.3275
Total Amount |  |  | $ 42,850

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