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Other Financial Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Accrued expenses    
Accrued salaries and benefits $ 814,500 $ 400,600
Accrued contract costs 1,002,600 446,400
Other accrued expenses 295,900 117,600
Total accrued expenses 2,112,951 964,627
Accrued contract costs related to professional liability accruals $ 236,400 $ 120,200