CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 637,462	$ 103,711	$ 1,375,639
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale marketable securities, net of income tax (expense) benefit of $(15,501), $9,834, and $6,003 during the fiscal years ended January 31, 2024, 2023 and 2022, respectively	51,448	(32,483)	(18,741)
Comprehensive income	$ 688,910	$ 71,228	$ 1,356,898