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Other Financial Information - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Other Financial Information [Abstract]    
Accrued salaries and benefits $ 596,900 $ 620,400
Accrued contract costs 1,379,800 1,354,700
Other accrued expenses 383,800 410,600
Total $ 2,360,461 $ 2,385,731