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Acquisitions Summary of Fair Value of Assets Acquired and Liabilities Assumed by Major Class (Details) - USD ($) $ in Millions | Apr. 30, 2016 | Jan. 31, 2016
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 1,580.5 | $ 1,535.0
Series of Individually Immaterial Business Acquisitions |  |
Business Acquisition [Line Items] |  |
Goodwill | 45.4 |
Deferred revenue (current and non-current) | (0.3) |
Deferred tax liability | (2.8) |
Net tangible assets | 0.4 |
Total | 61.3 |
Series of Individually Immaterial Business Acquisitions | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 11.5 |
Series of Individually Immaterial Business Acquisitions | Customer relationships and other non-current intangible assets |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 4.6 |
Series of Individually Immaterial Business Acquisitions | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | $ 2.5 |

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Excluding Intangible Assets And Deferrals + References No definition available. + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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