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Business Acquisitions, Goodwill and Intangible Assets - URS Acquisition (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 17, 2014 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) item | Mar. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) item
Business acquisition |  |  |  |  |  |
Number of acquisition | item |  |  |  | 1 |  | 2
Total consideration |  |  |  | $ 5.6 |  | $ 164.4
URS |  |  |  |  |  |
Business acquisition |  |  |  |  |  |
Ownership acquired (in percent) | 100.00% |  |  |  |  |
Total consideration | $ 2,300.0 |  |  |  |  |
Consideration paid by issuing stock | 1,600.0 |  |  |  |  |
Senior notes assumed, net of Company repayments | 400.0 |  |  |  |  |
Repayment of acquiree term loan as part of consideration | 600.0 |  |  |  |  |
Repayment of acquiree line of credit as part of consideration | 100.0 |  |  |  |  |
Accrued expenses and other current liabilities | 240.0 |  |  |  |  |
Amortization of intangible assets of acquiree for the period |  | $ 18.2 | $ 20.9 | 36.4 | $ 41.8 |
Fair value adjustment of joint ventures |  | 1.7 | 2.5 | 3.6 | 4.5 |
Fair value adjustment of noncontrolling interests |  | (2.1) | (2.1) | (4.2) | (4.2) |
Fair value of margin liability | $ 149.1 |  |  |  |  |
Carrying value margin fair value liability |  | 6.4 |  | 6.4 |  | $ 8.6
Margin liability recognition period ( in years) | 2 years |  |  |  |  |
Revenue and related income from operations related to margin fair value liability |  | $ 1.1 | $ 1.6 | $ 2.2 | $ 3.2 |
URS | Customer relationships, contracts and backlog |  |  |  |  |  |
Business acquisition |  |  |  |  |  |
Acquired backlog and customer relationship assets | $ 973.8 |  |  |  |  |
URS | Customer relationships, contracts and backlog | Minimum |  |  |  |  |  |
Business acquisition |  |  |  |  |  |
Useful life (in years) | 1 year |  |  |  |  |
URS | Customer relationships, contracts and backlog | Maximum |  |  |  |  |  |
Business acquisition |  |  |  |  |  |
Useful life (in years) | 11 years |  |  |  |  |
URS | Customer relationships, contracts and backlog | Weighted Average |  |  |  |  |  |
Business acquisition |  |  |  |  |  |
Useful life (in years) | 3 years |  |  |  |  |

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- Definition This element represents the amount of amortization of intangible assets of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References No definition available. + Details
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- Definition Amount of billings in excess of costs on uncompleted contracts assumed at the acquisition date. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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