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Business Acquisitions, Goodwill and Intangible Assets - Disposal Group (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2018 | Sep. 30, 2018 | Mar. 31, 2019
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet |  |  |  |  |
Impairment of assets held for sale, including goodwill |  | $ 168,178 | $ 168,178 |  |
Construction Services |  |  |  |  |
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet |  |  |  |  |
Impairment of assets held for sale, including goodwill |  | 168,200 | $ 168,200 |  |
Construction Services |  |  |  |  |
Classification of related assets and liabilities of the Disposal Group as held for sale in the consolidated balance sheet |  |  |  |  |
Impairment of assets held for sale, including goodwill |  | $ 168,200 |  |  |
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 goodwill |  |  |  | $ 125,400 |
Impairment of intangible and other noncurrent assets |  |  |  | $ 42,800 |
Accounts receivable included in Current assets held for sale |  |  |  |  | $ 37,200
Property plant and equipment included in Current assets held for sale |  |  |  |  | 17,500
Accounts payable included in Current liabilities held for sale |  |  |  |  | $ 17,000

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- Definition Amount classified as accounts payable attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2473-110228 + Details
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