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Business Acquisitions, Goodwill and Intangible Assets - Disposal Group (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet              
Loss on disposal of portion of assets in the disposal group $ 800 $ 2,100   $ (600) $ 2,949 $ (572) $ 42,589
Impairment of assets held for sale, including goodwill     $ 168,200   168,178    
Impairment of goodwill         125,400    
Disposal activities              
Net assets related to the loss on disposal activities 59,800       59,800    
Construction Services              
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet              
Loss on disposal of portion of assets in the disposal group         2,900   $ 42,600
Impairment of assets held for sale, including goodwill         168,200    
Impairment of goodwill         125,400    
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              
Loss on disposal of portion of assets in the disposal group   $ 2,100          
Impairment of intangible and other noncurrent assets         42,800    
Accounts receivable included in Current assets held for sale 44,500       44,500    
Property plant and equipment included in Current assets held for sale 14,900       14,900    
Accounts payable included in Current liabilities held for sale $ 22,300       $ 22,300    
URS              
Disposal activities              
Net assets related to the loss on disposal activities           $ 112,800