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Composition of Certain Financial Statement Captions - Prepaid and Other Assets (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Prepaid income taxes | $ 44,927 | $ 3,154
Other Prepaid Expense, Current | 40,800 | 36,950
Prepaid expenses and other current assets | $ 85,727 | $ 40,104

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