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Acquisitions (Tables)
 3 Months Ended
Apr. 30, 2016
Business Combinations [Abstract]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed
The following table summarizes the fair value of the assets acquired and liabilities assumed by major class for the business combinations and technology acquisitions completed during the three months ended April 30, 2016:

 
 
April 30, 2016
Developed technologies
 
$
11.5

Customer relationships and other non-current intangible assets
 
4.6

Trade name
 
2.5

Goodwill
 
45.4

Deferred revenue (current and non-current)
 
(0.3
)
Deferred tax liability
 
(2.8
)
Net tangible assets
 
0.4

Total
 
$
61.3