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Other Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Accrued expenses and other current liabilities      
Accrued salaries and benefits $ 678,800   $ 675,700
Accrued contract costs 1,137,300   1,104,700
Other accrued expenses 449,600   431,300
Total accrued expenses 2,265,731   2,211,734
Restructuring costs 13,038 $ 44,925  
Accrued restructuring expenses 1,700 16,700  
Minimum      
Accrued expenses and other current liabilities      
Restructuring and Related Cost, Expected Cost 30,000    
Maximum      
Accrued expenses and other current liabilities      
Restructuring and Related Cost, Expected Cost 50,000    
Personnel and other costs      
Accrued expenses and other current liabilities      
Restructuring costs 10,200 38,200  
Real estate costs      
Accrued expenses and other current liabilities      
Restructuring costs 2,800 $ 6,700  
Professional liability accrual      
Accrued expenses and other current liabilities      
Accrued contract costs $ 628,500   $ 596,000