Commitments and Contingencies - Additional Information (Details) - USD ($)		12 Months Ended
	Oct. 18, 2016	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Rent expense recognized under operating leases		$ 16,600,000	$ 11,000,000	$ 7,500,000
Non-cancelable purchase obligation related to software services		4,100,000	5,900,000
Outstanding letters of credit		7,700,000	$ 7,100,000
Loss Contingencies [Line Items]
Loss contingency		$ 0
Dell
Loss Contingencies [Line Items]
Loss contingency, damages awarded, value	$ 30,000,000