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Other Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Accrued expenses and other current liabilities    
Accrued salaries and benefits $ 900,800 $ 1,018,500
Accrued contract costs 833,500 911,900
Other accrued expenses 337,900 315,100
Total accrued expenses 2,072,155 2,245,519
Restructuring charges 22,400  
Payments for restructuring charges 9,600  
Accounts receivable-net 5,313,672 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 $ 537,700 $ 547,900