CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 15,444	$ 113,658
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale marketable securities, net of income tax (expense) benefit of $(4,674) and $8,686 for the three months ended April 30, 2023 and 2022, respectively	15,514	(27,335)
Comprehensive income	$ 30,958	$ 86,323