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Other Financial Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Accrued expenses and other current liabilities    
Accrued salaries and benefits $ 1,035,900 $ 1,018,500
Accrued contract costs 861,000 911,900
Other accrued expenses 370,100 315,100
Total accrued expenses 2,267,046 2,245,519
Accounts receivable-net 5,468,821 5,127,743
Accelerated recovery of pension entitlement    
Accrued expenses and other current liabilities    
Accounts receivable-net 50,000 50,000
Professional liability accrual    
Accrued expenses and other current liabilities    
Accrued contract costs $ 519,500 $ 547,900