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Other Financial Information - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Other Financial Information [Abstract]    
Accrued salaries and benefits $ 686,700 $ 620,400
Accrued contract costs 1,455,400 1,354,700
Other accrued expenses 356,100 410,600
Total $ 2,498,168 $ 2,385,731