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Dividends - Summary of Dividends Declared by Board of directors (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Aug. 07, 2019 | May 14, 2019 | Feb. 05, 2019 | Nov. 08, 2018 | Jul. 31, 2018 | May 10, 2018 | Jan. 30, 2018 | Nov. 08, 2017 | Aug. 02, 2017 | May 09, 2017 | Feb. 01, 2017 | Nov. 08, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.105 | $ 0.970 | $ 0.855
Declaration Date, August 7, 2018 [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, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 08, 2017 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 29, 2017 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 19, 2018 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  | $ 0.220 |  |  |  |  |  |  |
Total Amount |  |  |  |  |  |  |  | $ 31,556 |  |  |  |  |  |  |
Declaration Date, July 31, 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 31, 2018 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 28, 2018 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 19, 2018 |  |
Dividends Per Ordinary Share |  |  |  |  | $ 0.250 |  |  |  |  |  |  |  |  |  |
Total Amount |  |  |  |  | $ 35,046 |  |  |  |  |  |  |  |  |  |
Declaration Date, May 10, 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | May 10, 2018 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 29, 2018 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 20, 2018 |  |
Dividends Per Ordinary Share |  |  |  |  |  | $ 0.250 |  |  |  |  |  |  |  |  |
Total Amount |  |  |  |  |  | $ 35,363 |  |  |  |  |  |  |  |  |
Declaration Date, January 30, 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 30, 2018 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 30, 2018 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 20, 2018 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  | $ 0.250 |  |  |  |  |  |  |  |
Total Amount |  |  |  |  |  |  | $ 35,637 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Declaration Date, August 2, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 02, 2017 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 29, 2017 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 23, 2017 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  | $ 0.220 |  |  |  |  |  |
Total Amount |  |  |  |  |  |  |  |  | $ 31,736 |  |  |  |  |  |
Declaration Date, May 9, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | May 09, 2017 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2017 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 14, 2017 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  | $ 0.220 |  |  |  |  |
Total Amount |  |  |  |  |  |  |  |  |  | $ 31,981 |  |  |  |  |
Declaration Date, February 1, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 01, 2017 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 31, 2017 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 14, 2017 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  |  | $ 0.220 |  |  |  |
Total Amount |  |  |  |  |  |  |  |  |  |  | $ 32,223 |  |  |  |
Declaration Date, November 8, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 08, 2016 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 30, 2016 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 13, 2017 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  |  |  | $ 0.195 |  |  |
Total Amount |  |  |  |  |  |  |  |  |  |  |  | $ 28,606 |  |  |

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