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Segments Information Regarding Operations by Geographic Area (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2016 | Jul. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | $ 550.7 | $ 609.5 | $ 1,062.6 | $ 1,256.0
Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 230.1 | 235.7 | 447.8 | 479.7
Americas | U.S. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 195.2 | 194.5 | 379.9 | 394.1
Americas | Other Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 34.9 | 41.2 | 67.9 | 85.6
Europe, Middle East and Africa |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 220.5 | 225.7 | 423.1 | 471.1
Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 100.1 | 148.1 | 191.7 | 305.2
Asia Pacific | Japan |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 36.8 | 50.7 | 74.1 | 115.8
Asia Pacific | Other Asia Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | $ 63.3 | $ 97.4 | $ 117.6 | $ 189.4

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