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Repurchase of Shares - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Sep. 30, 2018	Nov. 08, 2017	Feb. 02, 2016
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, Authorized amount		$ 800,000,000
Repurchase of shares, Shares	6,337
Average price at which ordinary shares are repurchased	$ 66.14
Remaining authority to repurchase outstanding ordinary shares	$ 637,127,000
Share Repurchase Program 2016 Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, Authorized amount			$ 750,000,000

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Number of shares that have been repurchased during the period and are being held in treasury.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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