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Derivative Financial Instruments - Effect of Non-Designated as Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, (Loss) Gain [Line Items]
Gains (Losses) Recognized in Income	$ (20,585)	$ (12,415)	$ 5,957
Cost of Revenue [Member]
Derivative Instruments, (Loss) Gain [Line Items]
Gains (Losses) Recognized in Income	(2,126)	(8,731)	4,786
Research and Development [Member]
Derivative Instruments, (Loss) Gain [Line Items]
Gains (Losses) Recognized in Income	(1,078)	(2,195)	1,187
Selling, General and Administrative [Member]
Derivative Instruments, (Loss) Gain [Line Items]
Gains (Losses) Recognized in Income	(996)	(2,375)	1,301
Interest and Other Expense, Net [Member]
Derivative Instruments, (Loss) Gain [Line Items]
Gains (Losses) Recognized in Income	(16,312)	(2,132)	1,808
Income Taxes [Member]
Derivative Instruments, (Loss) Gain [Line Items]
Gains (Losses) Recognized in Income	$ (73)	$ 3,018	$ (3,125)

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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