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Other Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Accrued expenses and other current liabilities        
Accrued salaries and benefits $ 878,600 $ 878,600   $ 1,035,900
Accrued contract costs 872,100 872,100   861,000
Other accrued expenses 384,400 384,400   370,100
Total accrued expenses 2,135,122 2,135,122   2,267,046
Accounts receivable-net 3,285,939 3,285,939   3,307,851
Restructuring costs 15,875 79,170    
Accrued restructuring expenses 39,900 39,900    
Severance expense     $ 25,600  
Minimum        
Accrued expenses and other current liabilities        
Estimated restructuring costs 80,000 80,000    
Maximum        
Accrued expenses and other current liabilities        
Estimated restructuring costs 90,000 90,000    
Severance and personnel costs        
Accrued expenses and other current liabilities        
Restructuring costs   57,100    
Real estate costs        
Accrued expenses and other current liabilities        
Restructuring costs   22,100    
Accelerated recovery of pension entitlement        
Accrued expenses and other current liabilities        
Accounts receivable-net 50,000 50,000    
Professional liability accrual        
Accrued expenses and other current liabilities        
Accrued contract costs $ 468,300 $ 468,300   $ 519,500