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Segment, Geographic and Product Family Information - Operations by Geographic Area and Product Family (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 553.8 | $ 515.3 | $ 501.8 | $ 485.7 | $ 478.8 | $ 489.6 | $ 550.7 | $ 511.9 | $ 2,056.6 | $ 2,031.0 | $ 2,504.1
Total long-lived assets | 145.0 |  |  |  | 158.6 |  |  |  | 145.0 | 158.6 |
Architecture, Engineering and Construction |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 866.5 | 880.9 | 949.1
Manufacturing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 589.2 | 625.8 | 724.6
AutoCAD and AutoCAD LT |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 401.4 | 326.7 | 594.8
Media and Entertainment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 152.0 | 138.9 | 160.0
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 47.5 | 58.7 | 75.6
U.S. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 740.4 | 742.1 | 803.9
Total long-lived assets | 99.3 |  |  |  | 118.8 |  |  |  | 99.3 | 118.8 |
Other Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 130.7 | 129.8 | 168.9
Total long-lived assets | 14.6 |  |  |  | 5.9 |  |  |  | 14.6 | 5.9 |
Total Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 871.1 | 871.9 | 972.8
Total long-lived assets | 113.9 |  |  |  | 124.7 |  |  |  | 113.9 | 124.7 |
Europe, Middle East, and Africa |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 815.4 | 800.4 | 934.6
Total long-lived assets | 16.7 |  |  |  | 18.7 |  |  |  | 16.7 | 18.7 |
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 370.1 | 358.7 | $ 596.7
Total long-lived assets | $ 14.4 |  |  |  | $ 15.2 |  |  |  | $ 14.4 | $ 15.2 |

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