Short-Term Investments - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands	Oct. 31, 2023	Jan. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	$ 3,235,448	$ 2,244,966
Gross unrealized gains	462	2,555
Gross unrealized losses	(37,340)	(31,358)
Estimated fair value	3,198,570	2,216,163
Certificates of deposits
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	111,560	37,998
Gross unrealized gains	21	31
Gross unrealized losses	(98)	(66)
Estimated fair value	111,483	37,963
Asset-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	576,705	448,081
Gross unrealized gains	86	585
Gross unrealized losses	(6,289)	(5,708)
Estimated fair value	570,502	442,958
Commercial paper
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	193,975	155,097
Gross unrealized gains	1	8
Gross unrealized losses	(203)	(580)
Estimated fair value	193,773	154,525
Corporate notes and bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	1,424,054	1,224,195
Gross unrealized gains	344	1,649
Gross unrealized losses	(19,026)	(17,880)
Estimated fair value	1,405,372	1,207,964
Foreign government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	32,371	24,654
Gross unrealized gains	0	13
Gross unrealized losses	(422)	(516)
Estimated fair value	31,949	24,151
Municipal securities
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	73,217
Gross unrealized gains	6
Gross unrealized losses	(803)
Estimated fair value	72,420
U.S. agency obligations
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	49,169	32,995
Gross unrealized gains	0	4
Gross unrealized losses	(256)	(594)
Estimated fair value	48,913	32,405
U.S. treasury securities
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	774,397	321,946
Gross unrealized gains	4	265
Gross unrealized losses	(10,243)	(6,014)
Estimated fair value	$ 764,158	$ 316,197