Commitments and Contingencies - Additional Information (Details) $ in Millions	Oct. 18, 2016 USD ($)	Oct. 31, 2016 USD ($) lease_agreement	Jan. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Outstanding letters of credit		$ 7.7	$ 7.1
Dell
Loss Contingencies [Line Items]
Litigation settlement payment	$ 30.0
Office Facility Leases
Loss Contingencies [Line Items]
Number of lease agreements | lease_agreement		4
Total operating lease obligations		$ 43.7