Stockholders' Equity (Tables)

12 Months Ended

Jan. 31, 2016

Equity [Abstract]

Summary of Reserved Shares of Common Stock for Future Issuance

As of January 31, 2016, we had reserved shares of common stock for future issuance as follows:

	January 31, 2016
Shares underlying outstanding stock options		68,879,087
Shares reserved for future equity awards		25,337,800
Shares reserved for future employee stock purchase    plan awards		3,500,000
Total		97,716,887