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Segments Information Regarding Operations by Geographic Area (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Apr. 30, 2016 | Apr. 30, 2015
Segment Reporting Information [Line Items] |  |
Net revenue | $ 511.9 | $ 646.5
Americas |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 217.7 | 244.0
Americas | U.S. |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 184.7 | 199.6
Americas | Other Americas |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 33.0 | 44.4
Europe, Middle East and Africa |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 202.6 | 245.4
Asia Pacific |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 91.6 | 157.1
Asia Pacific | Japan |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 37.3 | 65.1
Asia Pacific | Other Asia Pacific |  |
Segment Reporting Information [Line Items] |  |
Net revenue | $ 54.3 | $ 92.0

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