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Segments - Operations by geographic area (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | [1] | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  | $ 478.8 | $ 489.6 | $ 550.7 | $ 511.9 | $ 648.3 | $ 599.8 | $ 609.5 | $ 646.5 | $ 2,031.0 | $ 2,504.1 | $ 2,512.2
Total long-lived assets | [2] | 158.6 |  |  |  | 169.3 |  |  |  | 158.6 | 169.3 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 2,031.0 | 2,504.1 | 2,512.2
Architecture, Engineering, and Construction | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 880.9 | 949.1 | 872.6
Manufacturing | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 625.8 | 724.6 | 675.6
AutoCAD and AutoCAD LT | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 326.7 | 594.8 | 695.1
Media and Entertainment | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 138.9 | 160.0 | 167.3
Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 58.7 | 75.6 | 101.6
Americas |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 871.9 | 972.8 | 898.0
Total long-lived assets | [2] | 124.7 |  |  |  | 122.0 |  |  |  | 124.7 | 122.0 |
Europe, Middle East, and Africa |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 800.4 | 934.6 | 980.0
Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 358.7 | 596.7 | 634.2
Total long-lived assets | [2] | 15.2 |  |  |  | 21.6 |  |  |  | 15.2 | 21.6 |
U.S. | Americas |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 742.1 | 803.9 | 736.4
Total long-lived assets | [2] | 118.8 |  |  |  | 118.8 |  |  |  | 118.8 | 118.8 |
Other Americas | Americas |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  | 129.8 | 168.9 | $ 161.6
Total long-lived assets | [2] | 5.9 |  |  |  | 3.2 |  |  |  | 5.9 | 3.2 |
Europe, Middle East, and Africa | Europe, Middle East, and Africa |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total long-lived assets | [2] | $ 18.7 |  |  |  | $ 25.7 |  |  |  | $ 18.7 | $ 25.7 |
[1] | Certain first quarter fiscal 2017 balances have been revised to reflect the adoption of ASU 2016-09. As the adoption occurred in the second quarter of fiscal 2017, we are required to reflect any adjustments as of February 1, 2016, the beginning of the annual period that includes the interim period of adoption, and are required to revise our reported quarterly results for the first quarter. The revision resulted in a $5.3 million decrease of stock-based compensation expense from the previously reported expense. See Note 1, "Business and Summary of Significant Accounting Policies" for further discussion on the adoption.
[2] | (1)Long-lived assets exclude deferred tax assets, marketable securities, goodwill, and other intangible assets.

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