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Dividends - Summary of Dividends Declared by Board of directors (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 02, 2017 | May 09, 2017 | Feb. 01, 2017 | Nov. 08, 2016 | Jul. 26, 2016 | May 04, 2016 | Feb. 02, 2016 | Nov. 10, 2015 | Jul. 29, 2015 | Apr. 29, 2015 | Jan. 27, 2015 | Nov. 04, 2014 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.855 | $ 0.755 | $ 0.665
Dividend 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend 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 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend 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 |  |  |  |  |  |  |  |  |  |  |  |
Dividend 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 |  |  |  |  |  |  |
Declaration Date, July 29, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 29, 2015 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 30, 2015 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 16, 2015 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  | $ 0.170 |  |  |  |  |  |
Total Amount |  |  |  |  |  |  |  |  | $ 25,697 |  |  |  |  |  |
Declaration Date, April 29, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 29, 2015 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2015 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 17, 2015 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  | $ 0.170 |  |  |  |  |
Total Amount |  |  |  |  |  |  |  |  |  | $ 26,127 |  |  |  |  |
Declaration Date, January 27, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 27, 2015 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 31, 2015 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 16, 2015 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  |  | $ 0.170 |  |  |  |
Total Amount |  |  |  |  |  |  |  |  |  |  | $ 26,286 |  |  |  |
Declaration Date, November 04, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 04, 2014 |  |
Record Date |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2014 |  |
Payment Date |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 16, 2015 |  |
Dividends Per Ordinary Share |  |  |  |  |  |  |  |  |  |  |  | $ 0.155 |  |  |
Total Amount |  |  |  |  |  |  |  |  |  |  |  | $ 24,086 |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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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://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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=6876686&loc=d3e534808-122878 + Details
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