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Other Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 12, 2024
Accrued expenses and other current liabilities        
Accrued salaries and benefits $ 620,400 $ 599,800    
Accrued contract costs 1,354,700 1,340,400    
Other accrued expenses 410,600 347,300    
Total 2,385,731 2,287,546    
Restructuring costs 98,918 188,404 $ 107,501  
Accrued restructuring expenses 11,900 53,300    
Dividend paid per share in cash       $ 0.22
Accrued and unpaid dividend 31,900      
Labor-related costs        
Accrued expenses and other current liabilities        
Restructuring costs 18,700 91,600    
Non-labor costs        
Accrued expenses and other current liabilities        
Restructuring costs 80,200      
Real estate costs        
Accrued expenses and other current liabilities        
Restructuring costs   96,800    
Professional liability accrual        
Accrued expenses and other current liabilities        
Accrued contract costs $ 831,800 $ 809,600