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Segments Concerning the Operations Of Reportable Segments (Details) $ in Millions | 3 Months Ended
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Apr. 30, 2016 USD ($) segment | Apr. 30, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | segment |  | 4 |
Net revenue |  | $ 511.9 | $ 646.5
Gross profit |  | 419.4 | 554.7
Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue |  | 511.9 | 646.5
Unallocated |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross profit | [1] | (14.4) | (16.4)
Architecture, Engineering and Construction | Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue |  | 218.9 | 236.7
Gross profit |  | 193.6 | 217.0
Manufacturing | Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue |  | 158.0 | 184.6
Gross profit |  | 136.1 | 158.1
Platform Solutions and Emerging Business | Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue |  | 100.0 | 185.3
Gross profit |  | 76.1 | 163.3
Media and Entertainment | Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue |  | 35.0 | 39.9
Gross profit |  | $ 28.0 | $ 32.7
[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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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + 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) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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