CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 358,592	$ 219,015	$ 613,195	$ 435,323
Other comprehensive (loss) income:
Unrealized (loss) gain on available-for-sale marketable securities, net of income tax benefit (expense) of $4,804 and $(6,038) for the three months ended July 31, 2025 and 2024, respectively, and $1,681 and $(346) for the six months ended July 31, 2025 and 2024, respectively	(15,622)	19,681	(5,467)	1,128
Comprehensive income	$ 342,970	$ 238,696	$ 607,728	$ 436,451