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Derivative Financial Instruments - Effect of Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion) | $ 11,205 | $ (24,279) | $ (47,195)
Revenue [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion) | (1,248) | 1,116 | 1,132
Cost of Revenue [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion) | 6,549 | (15,438) | (30,078)
Research and Development [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion) | 2,863 | (5,020) | (9,151)
Selling, General and Administrative [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion) | $ 3,041 | $ (4,937) | $ (9,098)

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