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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 | 9 Months Ended
--- | --- | ---
Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2017 | Oct. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | $ 515.3 | $ 489.6 | $ 1,502.8 | $ 1,552.2
Architecture, Engineering and Construction |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 215.4 | 212.3 | 628.7 | 684.4
Manufacturing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 146.9 | 146.6 | 436.0 | 481.5
AutoCAD and AutoCAD LT |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 102.7 | 80.1 | 290.7 | 239.1
Media and Entertainment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 37.7 | 34.2 | 112.1 | 103.6
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 12.6 | 16.4 | 35.3 | 43.6
U.S. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 182.4 | 182.2 | 546.8 | 562.1
Other Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 32.2 | 31.1 | 91.9 | 99.0
Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 214.6 | 213.3 | 638.7 | 661.1
Europe, Middle East and Africa |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 205.4 | 191.0 | 594.4 | 614.1
Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | $ 95.3 | $ 85.3 | $ 269.7 | $ 277.0

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