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Derivative Financial Instruments - Effect of Non-Designated as Hedging Instruments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (Losses) Recognized in Income | $ (3,025) | $ (10,434) | $ (20,585)
Cost of Revenue [Member] |  |  |
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (Losses) Recognized in Income | 1,378 | 1,055 | (2,126)
Research and Development [Member] |  |  |
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (Losses) Recognized in Income | 906 | 297 | (1,078)
Selling, General and Administrative [Member] |  |  |
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (Losses) Recognized in Income | 706 | 329 | (996)
Interest and Other Expense, Net [Member] |  |  |
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (Losses) Recognized in Income | (6,929) | (11,664) | (16,312)
Income Taxes [Member] |  |  |
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (Losses) Recognized in Income | $ 914 | $ (451) | $ (73)

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