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Acquisitions (Tables)
 12 Months Ended
Jan. 31, 2018
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 each of the business combinations and technology acquisitions completed during the fiscal year ended January 31, 2017:
Developed technologies
 
$
18.8

Customer relationships
 
10.2

Trade name
 
3.8

Goodwill
 
62.8

Deferred revenue (current and non-current)
 
(2.1
)
Deferred tax liability
 
(7.1
)
Net tangible (liabilities) assets
 
0.6

Total
 
$
87.0