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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, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Dividends Payable [Line Items] |  |  |
Dividends Per Ordinary Share | $ 1.2675 | $ 1.105 | $ 0.970
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, 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 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 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 |  |

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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(5)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(5)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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