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Net Loss Per Share - Summary of Diluted Net Loss Per Common Share (Detail) - shares
shares in Thousands
6 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive securities (in shares) 40,946 51,037
Outstanding common stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive securities (in shares) 4,512 5,832
Unvested RSUs and PRSUs    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive securities (in shares) 14,288 14,629
Shares related to the convertible senior notes    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive securities (in shares) 10,876 15,079
Shares subject to warrants related to the issuance of convertible senior notes    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive securities (in shares) 10,876 15,079
Shares issuable pursuant to the ESPP    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total anti-dilutive securities (in shares) 394 418