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Subsequent Events	6 Months Ended
Subsequent Events	Jul. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In August 2017, we entered into a seven-year term operating lease for approximately 45,831 square feet of office space in Mountain View, California with total rent obligation of $31.6 million. In connection with the lease, we have issued a letter of credit of $2.6 million. On August 22, 2017, Scott Dietzen resigned from his position as chief executive officer and was appointed as the chairman of our board of directors. On August 22, 2017, our board of directors appointed Charles H. Giancarlo, as the new chief executive officer and a member on our board of directors, effective immediately.