CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 181,974	$ 45,750	$ 197,418	$ 159,408
Other comprehensive (loss) income:
Unrealized gain (loss) on available-for-sale marketable securities, net of income tax (expense) benefit of $553 and $929 for the three months ended July 31, 2023 and 2022, respectively, and $(4,121) and $9,615 for the six months ended July 31, 2023 and 2022, respectively	(1,836)	(2,924)	13,678	(30,259)
Comprehensive income	$ 180,138	$ 42,826	$ 211,096	$ 129,149