Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Balance Sheet Components [Abstract]
Liabilities to employees and tax authorities from international employee stock sales	$ 48,547	$ 0
Accrued compensation and benefits	39,428	12,004
Accrued expenses	20,976	13,596
Operating lease liabilities, current	5,725	0
Other	13,388	6,656
Accrued expenses and other current liabilities	$ 128,064	$ 32,256