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Acquisitions Summary of Fair Value of Assets Acquired and Liabilities Assumed by Major Class (Details) - USD ($) $ in Millions | Oct. 31, 2016 | Jan. 31, 2016
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 1,557.3 | $ 1,535.0
Series of Individually Immaterial Business Acquisitions |  |
Business Acquisition [Line Items] |  |
Goodwill | 62.8 |
Deferred revenue (current and non-current) | (2.1) |
Deferred tax liability | (7.1) |
Net tangible assets | 0.6 |
Total | 87.0 |
Series of Individually Immaterial Business Acquisitions | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 18.8 |
Series of Individually Immaterial Business Acquisitions | Customer relationships and other non-current intangible assets |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 10.2 |
Series of Individually Immaterial Business Acquisitions | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | $ 3.8 |

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- Definition Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent. + 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=73530397&loc=d3e4845-128472 + Details
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