Commitments and Contingencies - Additional Information (Details)		12 Months Ended
	Mar. 15, 2016 USD ($)	Jan. 31, 2016 USD ($) Patent	Jan. 31, 2015 USD ($)	Jan. 31, 2014 USD ($)
Commitments And Contingencies [Line Items]
Reasonably possible loss contingency, maximum		$ 14,000,000
Lease expiration period		2025-12
Rent expense recognized under operating leases		$ 11,000,000	$ 7,500,000	$ 1,800,000
Non-cancelable purchase obligation related to software services		5,900,000	626,000,000
Outstanding letters of credit		$ 7,100,000	4,600,000
Letter of credit maturity year and month		2023-03
Loss contingency		$ 0	$ 0
Subsequent Event
Commitments And Contingencies [Line Items]
Royalty damages	$ 14,000,000
Patent Infringement
Commitments And Contingencies [Line Items]
Patent infringement allegations number | Patent		5