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Financial Instruments (Effects of Derivative Instruments on Condensed Consolidated Statements of Operations) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Apr. 30, 2019 | Apr. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net revenue | $ 735.5 | $ 559.9
Marketing and sales | 313.3 | 276.4
Research and development | 205.6 | 172.8
General and administrative | 99.1 | 72.9
Foreign currency contracts | Designated as hedging instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income | 0.7 |
Foreign currency contracts | Designated as hedging instrument | Subscription Revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income | 2.2 |
Foreign currency contracts | Designated as hedging instrument | Maintenance Revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income | 1.3 |
Foreign currency contracts | Designated as hedging instrument | Cost of subscription and maintenance revenue |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income | (0.1) |
Foreign currency contracts | Designated as hedging instrument | Marketing and sales |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income | (1.6) |
Foreign currency contracts | Designated as hedging instrument | Research and development |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income | (0.3) |
Foreign currency contracts | Designated as hedging instrument | General and administrative |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into income | (0.8) |
Foreign currency contracts | Derivatives not designated as hedging instruments | Interest and other expense, net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain recognized on derivatives | 4.1 | 4.6
Subscription |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net revenue | 595.8 | 350.4
Maintenance |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net revenue | 112.0 | 181.2
Subscription and Maintenance |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net revenue | 707.8 | 531.6
Cost of revenue | $ 59.7 | $ 50.4

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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