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Other Financial Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Accrued expenses    
Accrued salaries and benefits $ 711,900 $ 852,200
Accrued contract costs 997,300 993,100
Other accrued expenses 312,500 322,500
Total accrued expenses 2,021,749 2,167,771
Accrued contract costs related to professional liability accruals $ 231,000 $ 239,200