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Other Financial Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Accrued expenses    
Accrued salaries and benefits $ 964,900 $ 852,200
Accrued contract costs 1,009,800 993,100
Other accrued expenses 410,100 322,500
Total accrued expenses 2,384,815 $ 2,167,771
Accrued contract costs related to professional liability accruals 611,000  
Revenue related to recovery of pension related entitlement 50,000  
Noncurrent asset related to recovery of pension related entitlement $ 50,000