Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 213,618	$ 207,399
Less: accumulated depreciation	(106,525)	(86,907)
Total property and equipment, net	107,093	120,492
Servers
Property Plant And Equipment [Line Items]
Total property and equipment, gross	117,948	111,015
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment, gross	63,930	68,082
Computer hardware and software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	10,676	11,009
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total property and equipment, gross	12,649	12,485
Construction in progress
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 8,415	$ 4,808