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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, 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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