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Segments Concerning the Operations Of Reportable Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 segment | Oct. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  | 4 |  |  |
Net revenue | $ 618.0 |  | $ 555.2 |  | $ 1,847.6 |  | $ 1,687.3 |
Gross profit | 532.0 |  | 488.1 |  | 1,595.0 |  | 1,484.9 |
Unallocated |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gross profit | (14.5) | [1] | (12.2) | [1] | (44.9) | [1] | (36.9) | [1]
Platform Solutions and Emerging Business |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net revenue | 188.4 |  | 183.4 |  | 607.8 |  | 593.4 |
Gross profit | 167.3 |  | 165.9 |  | 543.6 |  | 540.7 |
Architecture, Engineering and Construction |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net revenue | 217.1 |  | 185.9 |  | 630.5 |  | 535.1 |
Gross profit | 194.3 |  | 168.9 |  | 566.0 |  | 485.0 |
Manufacturing |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net revenue | 169.7 |  | 142.0 |  | 485.2 |  | 425.1 |
Gross profit | 152.8 |  | 130.1 |  | 437.0 |  | 389.9 |
Media and Entertainment |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Number of product groups |  |  |  |  | 2 |  |  |
Net revenue | 42.8 |  | 43.9 |  | 124.1 |  | 133.7 |
Gross profit | $ 32.1 |  | $ 35.4 |  | $ 93.3 |  | $ 106.2 |
[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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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