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Other Financial Information (Details) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Accrued expenses and other current liabilities    
Accrued salaries and benefits $ 950,000 $ 1,018,500
Accrued contract costs 872,200 911,900
Other accrued expenses 345,500 315,100
Total accrued expenses 2,167,692 2,245,519
Restructuring charges 25,600  
Payments for restructuring charges 18,000  
Accounts receivable-net 5,208,918 5,127,743
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 $ 546,600 $ 547,900