Income Taxes - Components of the Net Income (Loss) before Provision of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Income Tax Disclosure [Abstract]
Domestic	$ 663,909	$ 16,268	$ (204)
Foreign	14,125	10,094	8,553
Total	$ 678,034	$ 26,362	$ 8,349