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Acquisitions Summary of Fair Value of Assets Acquired and Liabilities Assumed by Major Class (Details) (USD $) In Millions, unless otherwise specified | Oct. 31, 2014 | Jan. 31, 2014
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 1,474.1 | $ 1,009.9
Shotgun |  |
Business Acquisition [Line Items] |  |
Goodwill | 43.2 |
Deferred revenue (current and non-current) | (0.7) |
Deferred tax liability | (2.6) |
Net tangible assets (liabilities) | 0.1 |
Total | 54.5 |
Shotgun | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 5.4 |
Shotgun | Customer relationships and other non-current intangible assets |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 7.5 |
Shotgun | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 1.6 |
Within Technologies |  |
Business Acquisition [Line Items] |  |
Goodwill | 80.6 |
Deferred revenue (current and non-current) | 0 |
Deferred tax liability | (1.7) |
Net tangible assets (liabilities) | (0.3) |
Total | 88.0 |
Within Technologies | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 4.6 |
Within Technologies | Customer relationships and other non-current intangible assets |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 3.6 |
Within Technologies | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 1.2 |
Delcam |  |
Business Acquisition [Line Items] |  |
Goodwill | 192.8 |
Deferred revenue (current and non-current) | (10.4) |
Deferred tax liability | (15.3) |
Net tangible assets (liabilities) | 32.4 |
Total | 284.6 |
Delcam | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 28.9 |
Delcam | Customer relationships and other non-current intangible assets |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 39.7 |
Delcam | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 16.5 |
Other |  |
Business Acquisition [Line Items] |  |
Goodwill | 159.6 |
Deferred revenue (current and non-current) | (0.2) |
Deferred tax liability | (1.9) |
Net tangible assets (liabilities) | (0.6) |
Total | 207.2 |
Other | Developed technologies |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 35.4 |
Other | Customer relationships and other non-current intangible assets |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | 9.1 |
Other | Trade name |  |
Business Acquisition [Line Items] |  |
Finite-lived intangibles | $ 5.8 |

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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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