Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairments	$ (11,578)	$ (3,101)	$ (38,036)
Upward adjustments	0	0	4,125
Net unrealized gains (losses) on marketable equity securities	(2,428)	15,197	(12,524)
Net unrealized gains (losses) on strategic investments in equity securities	(14,006)	12,096	(46,435)
Net realized gains (losses) on strategic investments in equity securities	(17,414)	34,713	0
Total—included in other income (expense), net	$ (31,420)	46,809	$ (46,435)
Samooha, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity interest in acquiree, remeasurement gain		$ 34,000