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Segment, Geographic and Product Family Information Information Regarding Operations by Geographic Area and Product Family (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Apr. 30, 2017 | Apr. 30, 2016
Segment Reporting Information [Line Items] |  |
Net revenue | $ 485.7 | $ 511.9
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 485.7 | 511.9
Architecture, Engineering and Construction | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 204.5 | 218.9
Manufacturing | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 142.1 | 158.0
AutoCAD and AutoCAD LT | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 91.5 | 85.9
Media and Entertainment | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 36.5 | 35.0
Other | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 11.1 | 14.1
Americas |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 210.1 | 217.7
Americas | U.S. |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 179.8 | 184.7
Americas | Other Americas |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 30.3 | 33.0
Europe, Middle East and Africa |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 189.7 | 202.6
Asia Pacific |  |
Segment Reporting Information [Line Items] |  |
Net revenue | $ 85.9 | $ 91.6

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