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Business Acquisitions, Goodwill and Intangible Assets - Disposal Group (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet    
Impairment of goodwill   $ 125,400
Summary of financial information of the Disposal Group is as follows:    
Less: Impairment of assets held for sale $ (168,178) (168,178)
Total assets held for sale 116,755 116,755
Total liabilities held for sale 46,459 46,459
Construction Services | Disposal Group as held for sale    
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet    
Impairment of goodwill 125,400  
Impairment of intangible and other noncurrent assets 42,800  
Summary of financial information of the Disposal Group is as follows:    
Current assets 78,100 78,100
Non-current assets 81,500 81,500
Goodwill 125,400 125,400
Less: Impairment of assets held for sale (168,200) (168,200)
Total assets held for sale 116,800 116,800
Current liabilities 36,200 36,200
Non-current liabilities 10,300 10,300
Total liabilities held for sale 46,500 46,500
Net Assets Held for Sale $ 70,300 $ 70,300