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Derivative Financial Instruments - Effect of Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Item]
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion)	$ (47,195)	$ (16,035)	$ 32,152
Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Item]
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion)	1,132	445	(473)
Cost of Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Item]
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion)	(30,078)	(9,194)	20,209
Research and Development [Member]
Derivative Instruments, Gain (Loss) [Line Item]
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion)	(9,151)	(3,376)	6,069
Selling, General and Administrative [Member]
Derivative Instruments, Gain (Loss) [Line Item]
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion)	$ (9,098)	$ (3,910)	$ 6,347

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4C
-Subparagraph (c)
-SubTopic 10
-Topic 815
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C

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