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Segments Information Regarding Operations by Geographic Area and Product Family (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2016 | Oct. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | $ 489.6 | $ 599.8 | $ 1,552.2 | $ 1,855.8
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 489.6 | 599.8 | 1,552.2 | 1,855.8
Architecture, Engineering and Construction | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 212.3 | 224.9 | 684.4 | 695.0
Manufacturing | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 146.6 | 174.9 | 481.5 | 530.7
AutoCAD and AutoCAD LT Family | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 80.1 | 143.6 | 239.1 | 451.7
Media and Entertainment | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 34.2 | 39.1 | 103.6 | 119.8
Other | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 16.4 | 17.3 | 43.6 | 58.6
Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 213.3 | 235.8 | 661.1 | 715.5
Americas | U.S. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 182.2 | 195.6 | 562.1 | 589.7
Americas | Other Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 31.1 | 40.2 | 99.0 | 125.8
Europe, Middle East and Africa |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 191.0 | 225.1 | 614.1 | 696.2
Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 85.3 | 138.9 | 277.0 | 444.1
Asia Pacific | Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 28.7 | 49.0 | 102.8 | 164.8
Asia Pacific | Other Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | $ 56.6 | $ 89.9 | $ 174.2 | $ 279.3

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