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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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The amount of accounts receivable included in current assets held for sale.

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The aggregate amount of write-downs for impairments recognized during the period for intangible and other noncurrent assets.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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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.

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Amount classified as property, plant and equipment 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.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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