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Other Financial Information - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Other Financials Information [Line Items]          
Accrued contract costs including professional liability accruals $ 1,455,400   $ 1,455,400   $ 1,354,700
Restructuring expenses incurred $ 0 $ 29,025 0 $ 80,670  
Accrued restructuring expenses   $ 22,400   22,400  
Cash dividends declared (in dollars per share) $ 0.26        
Accrued and unpaid dividend $ 37,100   37,100    
Labor-Related Costs          
Other Financials Information [Line Items]          
Restructuring expenses incurred       15,100  
Non-Labor          
Other Financials Information [Line Items]          
Restructuring expenses incurred       $ 65,600  
Professional Liability Accrual          
Other Financials Information [Line Items]          
Accrued contract costs including professional liability accruals $ 835,500   $ 835,500   $ 831,800