CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 45,750	$ 317,084	$ 159,408	$ 544,615
Other comprehensive loss:
Unrealized loss on available-for-sale marketable securities, net of tax	(2,924)	(53)	(30,259)	(692)
Comprehensive income	$ 42,826	$ 317,031	$ 129,149	$ 543,923