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Other Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Accrued expenses and other current liabilities                  
Accrued salaries and benefits $ 675,700       $ 681,500     $ 675,700 $ 681,500
Accrued contract costs 1,104,700       927,100     1,104,700 927,100
Other accrued expenses 431,300       269,700     431,300 269,700
Total accrued expenses 2,211,734       1,878,319     2,211,734 1,878,319
Restructuring costs 91,900 $ 20,300 $ 31,200 $ 44,900 (16,200) $ (15,900) $ (63,300) 188,345 95,446
Loss related to remeasurement of self perform at risk construction business to fair value less cost to sell         24,900       24,900
Accrued restructuring expenses 56,200       26,500     56,200 26,500
Personnel and other costs                  
Accrued expenses and other current liabilities                  
Restructuring costs               149,200 73,300
Real estate costs                  
Accrued expenses and other current liabilities                  
Restructuring costs               39,100 22,100
Loss related to remeasurement of self perform at risk construction business to fair value less cost to sell                 27,400
Accelerated recovery of pension entitlement                  
Accrued expenses and other current liabilities                  
Expected amount of net subsidy               23,200  
Professional liability accrual                  
Accrued expenses and other current liabilities                  
Accrued contract costs $ 596,000       $ 536,600     $ 596,000 $ 536,600