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Dividends - Summary of Dividends Declared by Board of directors (Detail) - USD ($) $ / shares in Units, $ in Thousands													12 Months Ended
	Jul. 26, 2016	May 04, 2016	Feb. 02, 2016	Nov. 10, 2015	Jul. 29, 2015	Apr. 29, 2015	Jan. 27, 2015	Nov. 04, 2014	Jul. 29, 2014	Apr. 30, 2014	Jan. 29, 2014	Nov. 05, 2013	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Dividends Payable [Line Items]
Dividends Per Ordinary Share													$ 0.755	$ 0.665	$ 0.595
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, 2016 [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, 2015 [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
Declaration Date, July 29, 2014 [Member]
Dividends Payable [Line Items]
Declaration Date													Jul. 29, 2014
Record Date													Sep. 30, 2014
Payment Date													Oct. 17, 2014
Dividends Per Ordinary Share									$ 0.155
Total Amount									$ 24,291
Declaration Date, April 30, 2014 [Member]
Dividends Payable [Line Items]
Declaration Date													Apr. 30, 2014
Record Date													Jun. 30, 2014
Payment Date													Jul. 18, 2014
Dividends Per Ordinary Share										$ 0.155
Total Amount										$ 24,576
Declaration Date, January 29, 2014 [Member]
Dividends Payable [Line Items]
Declaration Date													Jan. 29, 2014
Record Date													Mar. 31, 2014
Payment Date													Apr. 17, 2014
Dividends Per Ordinary Share											$ 0.155
Total Amount											$ 24,799
Declaration Date, November 5, 2013 [Member]
Dividends Payable [Line Items]
Declaration Date													Nov. 05, 2013
Record Date													Dec. 31, 2013
Payment Date													Jan. 17, 2014
Dividends Per Ordinary Share												$ 0.130
Total Amount												$ 20,752

X

- 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

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+ 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

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+ 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

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+ 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

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