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Other Financial Information (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2016
Sep. 30, 2015
Accrued expenses    
Accrued salaries and benefits $ 905,300 $ 852,200
Accrued contract costs 1,150,300 993,100
Other accrued expenses 346,000 322,500
Total accrued expenses 2,401,555 $ 2,167,771
Accrued contract costs related to professional liability accruals 655,400  
Revenue related to recovery of pension related entitlement 45,000  
Noncurrent asset related to recovery of pension related entitlement $ 45,000