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Stockholders' Equity (Tables)
12 Months Ended
Jan. 31, 2019
Equity [Abstract]  
Summary of Reserved Shares of Common Stock for Future Issuance
As of January 31, 2019, we had reserved shares of Class A common stock for future issuance as follows:
 
January 31, 2019
Shares underlying outstanding stock options
35,465,543

Shares underlying outstanding restricted stock units
21,917,550

Shares reserved for future equity awards
15,792,845

Shares reserved for future employee stock purchase plan awards
1,318,558

Total
74,494,496