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Discontinued Operations, Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 28, 2022
Dec. 31, 2021
Mar. 31, 2021
Mar. 31, 2022
Sep. 30, 2021
Summary of financial information of the Disposal Group is as follows:          
Non-current assets held for sale       $ 6,777  
Long-term liabilities held for sale       345 $ 11,095
Held for sale          
Summary of financial information of the Disposal Group          
Contingent consideration, prior work claims       43,900  
Summary of financial information of the Disposal Group is as follows:          
Cash and cash equivalents       2,100 5,600
Receivables and contract assets       43,600 90,300
Other       32,000 43,500
Current assets held for sale       77,700 139,400
Property and equipment, net       6,800 52,900
Other         18,500
Write-down of assets to fair value less cost to sell         (71,400)
Non-current assets held for sale       6,800  
Accounts payable and accrued expenses       47,900 88,500
Other         5,500
Current liabilities held for sale       47,900 94,000
Long-term liabilities held for sale       $ 300 $ 11,100
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          
Pre-tax gain (loss)     $ (32,800)    
Held for sale | Oil and gas construction business          
Summary of financial information of the Disposal Group          
Consideration $ 14,000        
Pre-tax gain (loss) $ 3,000