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Other Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Accrued expenses and other current liabilities          
Accrued salaries and benefits $ 702,200   $ 702,200   $ 675,700
Accrued contract costs 1,252,300   1,252,300   1,137,500
Other accrued expenses 380,600   380,600   436,500
Total accrued expenses 2,335,077   2,335,077   2,249,704
Restructuring costs 12,971 $ 20,300 34,755 $ 96,438  
Accrued restructuring expenses 6,500   6,500    
Minimum          
Accrued expenses and other current liabilities          
Restructuring and Related Cost, Expected Cost 40,000   40,000    
Maximum          
Accrued expenses and other current liabilities          
Restructuring and Related Cost, Expected Cost 50,000   50,000    
Personnel and other costs          
Accrued expenses and other current liabilities          
Restructuring costs     25,800 83,500  
Real estate costs          
Accrued expenses and other current liabilities          
Restructuring costs     9,000 $ 12,900  
Professional liability accrual          
Accrued expenses and other current liabilities          
Accrued contract costs $ 800,400   $ 800,400   $ 625,900