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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, 2021	Sep. 30, 2020	Sep. 30, 2019
Dividends Payable [Line Items]
Dividends Per Ordinary Share	$ 1.4075	$ 1.2675	$ 1.105
Declaration Date, August 4, 2021 [Member]
Dividends Payable [Line Items]
Declaration Date	Aug. 04, 2021
Record Date	Sep. 30, 2021
Payment Date	Oct. 29, 2021
Dividends Per Ordinary Share	$ 0.36
Total Amount	$ 44,956
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 12, 2021 [Member]
Dividends Payable [Line Items]
Declaration Date	May 12, 2021
Record Date	Jun. 30, 2021
Payment Date	Jul. 23, 2021
Dividends Per Ordinary Share	$ 0.36
Total Amount	$ 45,580
Declaration Date, February 2, 2021 [Member]
Dividends Payable [Line Items]
Declaration Date	Feb. 02, 2021
Record Date	Mar. 31, 2021
Payment Date	Apr. 23, 2021
Dividends Per Ordinary Share	$ 0.36
Total Amount	$ 45,958
Declaration Date, November 10, 2020 [Member]
Dividends Payable [Line Items]
Declaration Date	Nov. 10, 2020
Record Date	Dec. 31, 2020
Payment Date	Jan. 22, 2021
Dividends Per Ordinary Share	$ 0.3275
Total Amount	$ 42,850
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
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, 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

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Date the declared dividend will be paid, in YYYY-MM-DD format.

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-Publisher FASB
-Name Accounting Standards Codification
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