CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 48,353	$ 340,383	$ 207,761	$ 884,998
Other comprehensive loss:
Unrealized loss on available-for-sale marketable securities, net of tax	(24,555)	(5,275)	(54,814)	(5,967)
Comprehensive income	$ 23,798	$ 335,108	$ 152,947	$ 879,031