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Other Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2016
Accrued expenses and other current liabilities              
Accrued salaries and benefits $ 1,020,700       $ 1,020,700 $ 1,035,900  
Accrued contract costs 913,900       913,900 861,000  
Other accrued expenses 455,800       455,800 370,100  
Total accrued expenses 2,390,418       2,390,418 2,267,046  
Accounts receivable-net 3,517,072       3,517,072 3,307,851  
Restructuring costs (16,200) $ (15,900) $ (63,300)   95,446    
Impairment of long-lived assets 615,400 $ 168,200   $ 168,200 615,400 168,178  
Accrued restructuring expenses 26,500       26,500    
Personnel and other costs              
Accrued expenses and other current liabilities              
Restructuring costs         73,300    
Real estate costs              
Accrued expenses and other current liabilities              
Restructuring costs         22,100    
Impairment of long-lived assets 27,400            
Accelerated recovery of pension entitlement              
Accrued expenses and other current liabilities              
Accounts receivable-net             $ 50,000
Professional liability accrual              
Accrued expenses and other current liabilities              
Accrued contract costs $ 573,400       $ 573,400 $ 519,500