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Discontinued Operations, Goodwill, and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2021
Sep. 30, 2020
Summary of financial information of the Disposal Group            
Asset Impairment Charges       $ 24,900    
Impairment     $ 83,600      
Impairment of Intangible Assets (Excluding Goodwill)     5,700      
Summary of financial information of the Disposal Group is as follows:            
Write-down of assets to fair value less cost to sell           $ 247,200
Non-current assets held for sale           54,354
Long-term liabilities held for sale         $ 11,095 79,254
Management Services            
Summary of financial information of the Disposal Group            
Consideration     2,280,000      
Favorable working capital price adjustment     122,000      
Contingent consideration, prior work claims     $ 120,000      
Held for sale            
Summary of financial information of the Disposal Group is as follows:            
Cash and cash equivalents         5,600 109,900
Receivables and contract assets         90,300 414,300
Other         43,500 38,200
Current assets held for sale         139,400 562,400
Property and equipment, net         52,900 119,800
Other         18,500 181,800
Write-down of assets to fair value less cost to sell         (71,400) (247,200)
Non-current assets held for sale           54,400
Accounts payable and accrued expenses         88,500 350,400
Contract liabilities           65,600
Other         5,500 1,600
Current liabilities held for sale         94,000 417,600
Long-term liabilities held for sale         $ 11,100 $ 79,300
Held for sale | Power construction business            
Summary of financial information of the Disposal Group            
Pre-tax gain (loss)   $ 17,300        
Held for sale | Civil infrastructure construction business            
Summary of financial information of the Disposal Group            
Losses on remeasurement to fair value less cost to sell, net of tax $ 32,800