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Other Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 01, 2023
Sep. 30, 2022
Accrued expenses and other current liabilities            
Accrued salaries and benefits $ 568,100   $ 568,100     $ 602,200
Accrued contract costs 1,279,200   1,279,200     1,246,000
Other accrued expenses 374,700   374,700     333,200
Total 2,222,038   2,222,038     2,181,408
Restructuring costs 9,115 $ 12,264 50,547 $ 88,927    
Accrued restructuring expenses 28,300   28,300      
Accrued restructuring expenses   $ 1,100   1,100    
Restructuring cost related to margins and delivery efficiency       19,800    
Dividend paid per share in cash         $ 0.18  
Accrued and unpaid dividend 26,800   26,800      
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     41,900 16,500    
Real estate costs            
Accrued expenses and other current liabilities            
Restructuring costs     8,600 3,300    
Real estate costs | Russia            
Accrued expenses and other current liabilities            
Restructuring costs       $ 69,100    
Professional liability accrual            
Accrued expenses and other current liabilities            
Accrued contract costs $ 717,000   $ 717,000     $ 713,600