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Net Income (Loss) Per Share - Summary of Diluted Net Loss Per Common Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total anti-dilutive securities (in shares) 4,415 36,040 10,370 34,133
Shares related to outstanding options, unvested RSUs, PRSUs, RSAs, and ESPP obligations        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total anti-dilutive securities (in shares) 4,415 16,004 2,552 14,029
Shares related to the convertible senior notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total anti-dilutive securities (in shares) 0 9,160 7,818 9,228
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) 0 10,876 0 10,876