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Other Financial Information - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Other Financials Information [Line Items]          
Accrued contract costs including professional liability accruals $ 1,411,000   $ 1,411,000   $ 1,354,700
Restructuring expenses incurred $ 0 $ 35,465 0 $ 51,645  
Accrued restructuring expenses   $ 7,300   7,300  
Cash dividends declared (in dollars per share) $ 0.26        
Accrued and unpaid dividend $ 36,600   36,600    
Labor-Related Costs          
Other Financials Information [Line Items]          
Restructuring expenses incurred       38,600  
Non-Labor          
Other Financials Information [Line Items]          
Restructuring expenses incurred       $ 13,000  
Professional Liability Accrual          
Other Financials Information [Line Items]          
Accrued contract costs including professional liability accruals $ 853,700   $ 853,700   $ 831,800