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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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Jul. 31, 2018 | May 10, 2018 | Jan. 30, 2018 | Nov. 08, 2017 | Aug. 02, 2017 | May 09, 2017 | Feb. 01, 2017 | Nov. 08, 2016 | Jul. 26, 2016 | May 04, 2016 | Feb. 02, 2016 | Nov. 10, 2015 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.970 | $ 0.855 | $ 0.755
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 |  |  | $ 35,635 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | $ 31,558 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Declaration Date, July 26, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 26, 2016 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 30, 2016 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 21, 2016 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  | $ 0.195 |  |  |  |  |  |
Total Amount |  |  |  |  |  |  |  |  | $ 28,693 |  |  |  |  |  |
Declaration Date, May 4 ,2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | May 04, 2016 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2016 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 15, 2016 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  | $ 0.195 |  |  |  |  |
Total Amount |  |  |  |  |  |  |  |  |  | $ 28,836 |  |  |  |  |
Declaration Date, February 2, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 02, 2016 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 31, 2016 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 15, 2016 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  |  | $ 0.195 |  |  |  |
Total Amount |  |  |  |  |  |  |  |  |  |  | $ 29,206 |  |  |  |
Declaration Date, November 10, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 10, 2015 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2015 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 15, 2016 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  |  |  | $ 0.170 |  |  |
Total Amount |  |  |  |  |  |  |  |  |  |  |  | $ 25,565 |  |  |

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