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Other Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Sep. 30, 2019
Accrued expenses and other current liabilities            
Accrued salaries and benefits $ 690,000   $ 690,000     $ 681,500
Accrued contract costs 1,050,000   1,050,000     927,100
Other accrued expenses 464,400   464,400     269,700
Total accrued expenses 2,204,433   2,204,433     1,878,319
Accounts receivable-net 2,888,939   2,888,939     2,869,216
Restructuring costs 31,213 $ 15,875 76,138 $ 79,170    
Accrued restructuring expenses 40,300   40,300      
Minimum            
Accrued expenses and other current liabilities            
Estimated restructuring costs         $ 160,000  
Maximum            
Accrued expenses and other current liabilities            
Estimated restructuring costs         $ 190,000  
Severance and personnel costs            
Accrued expenses and other current liabilities            
Restructuring costs     68,900 57,100    
Real estate costs            
Accrued expenses and other current liabilities            
Restructuring costs     7,200 $ 22,100    
Professional liability accrual            
Accrued expenses and other current liabilities            
Accrued contract costs $ 544,700   $ 544,700     $ 536,600