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Other Financial Information (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2018
Sep. 30, 2017
Accrued expenses and other current liabilities    
Accrued salaries and benefits $ 938,900 $ 1,018,500
Accrued contract costs 853,300 911,900
Other accrued expenses 392,500 315,100
Total accrued expenses 2,184,672 2,245,519
Restructuring charges 26,700  
Payments for restructuring charges 23,300  
Accounts receivable-net 5,447,985 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 $ 540,500 $ 547,900