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Other Financial Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Accrued expenses    
Accrued salaries and benefits $ 923,500 $ 964,900
Accrued contract costs 856,300 1,009,800
Other accrued expenses 339,600 410,100
Total accrued expenses 2,119,435 2,384,815
Accrued contract costs related to professional liability accruals $ 566,500 611,000
Noncurrent asset related to recovery of pension related entitlement   $ 50,000