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Composition of Certain Financial Statement Captions - Prepaid and Other Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
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