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Other Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Accrued expenses and other current liabilities                      
Accrued salaries and benefits $ 661,800       $ 675,700       $ 661,800 $ 675,700  
Accrued contract costs 1,202,100       1,137,500       1,202,100 1,137,500  
Other accrued expenses 310,300       436,500       310,300 436,500  
Total accrued expenses 2,174,201       2,249,704       2,174,201 2,249,704  
Restructuring costs 14,000 $ 13,000 $ 8,800 $ 13,000 91,900 $ 20,300 $ 31,200 $ 44,900 48,840 188,345 $ 95,446
Loss related to remeasurement of self perform at risk construction business to fair value less cost to sell                     $ 24,900
Accrued restructuring expenses 5,200       56,200       5,200 56,200  
Personnel and other costs                      
Accrued expenses and other current liabilities                      
Restructuring costs                 37,800 149,200  
Real estate costs                      
Accrued expenses and other current liabilities                      
Restructuring costs                 11,000 39,100  
Loss related to remeasurement of self perform at risk construction business to fair value less cost to sell                   27,400  
Professional liability accrual                      
Accrued expenses and other current liabilities                      
Accrued contract costs $ 736,400       $ 596,000       $ 736,400 $ 596,000