Short-Term Investments - Schedule of Fair Values and Gross Unrealized Loss Position of Available-for-Sale Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Apr. 30, 2024	Jan. 31, 2024
Certificates of deposits
Debt Securities, Available-for-Sale [Line Items]
12 months or less, Fair value	$ 66,055	$ 22,465
12 months or less, Gross unrealized losses	(55)	(14)
Greater than 12 months, Fair value	0	0
Greater than 12 months, Gross unrealized losses	0	0
Asset-backed securities
Debt Securities, Available-for-Sale [Line Items]
12 months or less, Fair value	415,388	120,543
12 months or less, Gross unrealized losses	(2,530)	(343)
Greater than 12 months, Fair value	91,285	105,419
Greater than 12 months, Gross unrealized losses	(1,304)	(1,444)
Commercial paper
Debt Securities, Available-for-Sale [Line Items]
12 months or less, Fair value	257,932	70,037
12 months or less, Gross unrealized losses	(119)	(20)
Greater than 12 months, Fair value	0	0
Greater than 12 months, Gross unrealized losses	0	0
Corporate notes and bonds
Debt Securities, Available-for-Sale [Line Items]
12 months or less, Fair value	1,191,177	394,823
12 months or less, Gross unrealized losses	(9,496)	(1,560)
Greater than 12 months, Fair value	235,212	280,092
Greater than 12 months, Gross unrealized losses	(3,173)	(3,628)
Foreign government bonds
Debt Securities, Available-for-Sale [Line Items]
12 months or less, Fair value	41,939	8,915
12 months or less, Gross unrealized losses	(336)	(19)
Greater than 12 months, Fair value	12,439	9,784
Greater than 12 months, Gross unrealized losses	(120)	(161)
Municipal securities
Debt Securities, Available-for-Sale [Line Items]
12 months or less, Fair value	44,941	31,418
12 months or less, Gross unrealized losses	(392)	(122)
Greater than 12 months, Fair value	16,998	13,686
Greater than 12 months, Gross unrealized losses	(81)	(109)
U.S. agency obligations
Debt Securities, Available-for-Sale [Line Items]
12 months or less, Fair value	55,709	1,795
12 months or less, Gross unrealized losses	(211)	(3)
Greater than 12 months, Fair value	0	4,991
Greater than 12 months, Gross unrealized losses	0	(9)
U.S. treasury securities
Debt Securities, Available-for-Sale [Line Items]
12 months or less, Fair value	498,599	280,946
12 months or less, Gross unrealized losses	(5,163)	(1,227)
Greater than 12 months, Fair value	136,749	204,274
Greater than 12 months, Gross unrealized losses	$ (2,215)	$ (2,597)