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Financial Instruments (Effects of Derivative Instruments on Condensed Consolidated Statements of Operations) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net revenue | $ 796.8 | $ 611.7 | $ 1,532.3 | $ 1,171.6
Marketing and sales | 316.8 | 289.1 | 630.1 | 565.5
Research and development | 215.4 | 180.8 | 421.0 | 353.6
General and administrative | 101.4 | 79.1 | 200.5 | 152.0
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 | 3.4 |  | 4.1 |
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 | 3.2 |  | 5.4 |
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 | 1.8 |  | 3.1 |
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 | (0.2) |  | (0.3) |
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 | (0.8) |  | (2.4) |
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 | (0.2) |  | (0.5) |
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 | (0.4) |  | (1.2) |
Subscription |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net revenue | 663.7 | 420.6 | 1,259.5 | 771.0
Maintenance |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net revenue | 103.5 | 166.4 | 215.5 | 347.6
Subscription and Maintenance |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total net revenue | 767.2 | 587.0 | 1,475.0 | 1,118.6
Cost of revenue | $ 53.0 | $ 54.1 | $ 112.7 | $ 104.5

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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=116634182&loc=SL114868664-224227 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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