Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Payables and Accruals [Abstract]
Accrued compensation	$ 42,600	$ 40,961
Accrued third-party cloud infrastructure expenses	12,303	8,360
ESPP employee contributions	8,764	0
Accrued professional services	5,123	5,200
Accrued taxes	2,654	2,352
Accrued purchases of property and equipment	2,237	430
Other	11,357	5,514
Total accrued expenses and other current liabilities	$ 85,038	$ 62,817