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Other Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 13, 2023
Accrued expenses and other current liabilities        
Accrued salaries and benefits $ 599,800 $ 602,200    
Accrued contract costs 1,340,400 1,246,000    
Other accrued expenses 347,300 333,200    
Total 2,287,546 2,181,408    
Restructuring costs 188,404 107,501 $ 48,840  
Accrued restructuring expenses 53,300 7,900    
Dividend paid per share in cash       $ 0.18
Accrued and unpaid dividend 26,700      
Foreign Currency Translation Adjustments        
Accrued expenses and other current liabilities        
Amounts reclassified from accumulated other comprehensive (loss) income   19,500    
Personnel and other costs        
Accrued expenses and other current liabilities        
Restructuring costs 91,600 27,500    
Real estate costs        
Accrued expenses and other current liabilities        
Restructuring costs 96,800 10,900    
Real estate costs | Russia        
Accrued expenses and other current liabilities        
Restructuring costs   69,100    
To improve margins and deliver efficiencies        
Accrued expenses and other current liabilities        
Restructuring cost related to margins and delivery efficiency   38,400    
Professional liability accrual        
Accrued expenses and other current liabilities        
Accrued contract costs $ 809,600 $ 789,300