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Other Financial Information - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Other Financial Information [Abstract]    
Accrued salaries and benefits $ 600,200 $ 620,400
Accrued contract costs 1,411,000 1,354,700
Other accrued expenses 341,700 410,600
Total $ 2,352,901 $ 2,385,731