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Dividends - Summary of Dividends Declared by Board of directors (Detail) - USD ($) $ / shares in Units, $ in Thousands													12 Months Ended
	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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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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