CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 1,375,639	$ 672,316	$ 25,305
Other comprehensive (loss) income:
Unrealized (loss) gain on available-for-sale marketable securities, net of tax	(18,741)	30	944
Comprehensive income	$ 1,356,898	$ 672,346	$ 26,249