Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Balance Sheet Components [Abstract]
Liabilities to employees and tax authorities from international employee stock sales	$ 267,917	$ 49,287
Accrued compensation and benefits	118,632	36,732
Accrued expenses	80,924	17,475
Sales and other tax liabilities	16,777	3,774
Operating lease liabilities, current	8,722	7,675
Other	14,038	7,749
Accrued expenses and other current liabilities	$ 507,010	$ 122,692