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Segments Concerning the Operations Of Reportable Segments (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2016 USD ($) | Apr. 30, 2016 USD ($) | Jul. 31, 2015 USD ($) | Jul. 31, 2016 USD ($) segment | Jul. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 4 |  |
Net revenue | $ 550.7 |  | $ 609.5 | $ 1,062.6 | $ 1,256.0 |
Gross profit | 465.6 | $ 419.5 | 516.5 | 885.1 | 1,071.2 |
Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenue | 550.7 |  | 609.5 | 1,062.6 | 1,256.0 |
Unallocated |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross profit | (14.1) |  | (14.4) | (28.4) | (30.8) | [1]
Architecture, Engineering and Construction | Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenue | 253.2 |  | 233.4 | 472.1 | 470.1 |
Gross profit | 229.1 |  | 209.5 | 422.7 | 426.5 |
Manufacturing | Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenue | 176.9 |  | 171.2 | 334.9 | 355.8 |
Gross profit | 156.4 |  | 151.2 | 292.5 | 309.3 |
Platform Solutions and Emerging Business | Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenue | 86.2 |  | 164.1 | 186.2 | 349.4 |
Gross profit | 65.5 |  | 138.5 | 141.6 | 301.8 |
Media and Entertainment | Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenue | 34.4 |  | 40.8 | 69.4 | 80.7 |
Gross profit | $ 28.7 |  | $ 31.7 | $ 56.7 | $ 64.4 |
[1] | Unallocated amounts primarily relate to corporate expenses and other costs and expenses that are managed outside the reportable segments, including stock-based compensation expense.

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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