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Other Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Nov. 13, 2023
Sep. 30, 2023
Accrued expenses and other current liabilities        
Accrued salaries and benefits $ 564,500     $ 599,800
Accrued contract costs 1,423,400     1,340,400
Other accrued expenses 432,100     347,300
Total 2,419,998     2,287,546
Restructuring costs 16,180 $ 37,459    
Accrued restructuring expenses 5,000      
Restructuring cost related to margins and delivery efficiency   1,300    
Dividend paid per share in cash     $ 0.22  
Accrued and unpaid dividend 32,300      
Personnel and other costs        
Accrued expenses and other current liabilities        
Restructuring costs 8,700 32,600    
Real estate costs        
Accrued expenses and other current liabilities        
Restructuring costs 7,500      
Real estate costs | Russia        
Accrued expenses and other current liabilities        
Restructuring costs   $ 36,200    
Professional liability accrual        
Accrued expenses and other current liabilities        
Accrued contract costs $ 813,800     $ 809,600