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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, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Dividends Payable [Line Items] |  |  |
Dividends Per Ordinary Share | $ 1.4075 | $ 1.2675 | $ 1.105
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, August 5, 2020 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | Aug. 05, 2020 |
Record Date |  | Sep. 30, 2020 |
Payment Date |  | Oct. 23, 2020 |
Dividends Per Ordinary Share |  | $ 0.3275 |
Total Amount |  | $ 43,084 |
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 |  |
Declaration Date, May 7, 2020 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | May 07, 2020 |
Record Date |  | Jun. 30, 2020 |
Payment Date |  | Jul. 24, 2020 |
Dividends Per Ordinary Share |  | $ 0.3275 |
Total Amount |  | $ 43,568 |
Declaration Date, February 4, 2020 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | Feb. 04, 2020 |
Record Date |  | Mar. 31, 2020 |
Payment Date |  | Apr. 24, 2020 |
Dividends Per Ordinary Share |  | $ 0.3275 |
Total Amount |  | $ 43,723 |
Declaration Date, November 12, 2019 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  | Nov. 12, 2019 |
Record Date |  | Dec. 31, 2019 |
Payment Date |  | Jan. 24, 2020 |
Dividends Per Ordinary Share |  | $ 0.285 |
Total Amount |  | $ 38,357 |
Declaration Date, August 7, 2019 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | Aug. 07, 2019
Record Date |  |  | Sep. 30, 2019
Payment Date |  |  | Oct. 25, 2019
Dividends Per Ordinary Share |  |  | $ 0.285
Total Amount |  |  | $ 38,413
Declaration Date, May 14, 2019 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | May 14, 2019
Record Date |  |  | Jun. 28, 2019
Payment Date |  |  | Jul. 19, 2019
Dividends Per Ordinary Share |  |  | $ 0.285
Total Amount |  |  | $ 38,730
Declaration Date, February 5, 2019 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | Feb. 05, 2019
Record Date |  |  | Mar. 29, 2019
Payment Date |  |  | Apr. 19, 2019
Dividends Per Ordinary Share |  |  | $ 0.285
Total Amount |  |  | $ 39,084
Declaration Date, November 8, 2018 [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Declaration Date |  |  | Nov. 08, 2018
Record Date |  |  | Dec. 31, 2018
Payment Date |  |  | Jan. 18, 2019
Dividends Per Ordinary Share |  |  | $ 0.250
Total Amount |  |  | $ 34,755

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