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Other Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Accrued expenses and other current liabilities      
Accrued salaries and benefits $ 869,100   $ 1,020,700
Accrued contract costs 598,200   583,900
Other accrued expenses 470,000   273,700
Total accrued expenses 1,937,339   1,878,319
Accounts receivable-net 2,839,696   2,869,216
Restructuring costs 44,925 $ 63,295  
Accrued restructuring expenses 16,700    
Minimum      
Accrued expenses and other current liabilities      
Estimated restructuring costs 160,000    
Maximum      
Accrued expenses and other current liabilities      
Estimated restructuring costs 190,000    
Severance and personnel costs      
Accrued expenses and other current liabilities      
Restructuring costs 38,200 46,000  
Real estate costs      
Accrued expenses and other current liabilities      
Restructuring costs 6,700 $ 17,300  
Professional liability accrual      
Accrued expenses and other current liabilities      
Accrued contract costs $ 539,100   $ 536,600