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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)

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