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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 | Oct. 31, 2023 | Jan. 31, 2023
--- | --- | ---
Certificates of deposits |  |
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | $ 54,902 | $ 15,934
12 months or less, Gross unrealized losses | (98) | (66)
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 | 404,973 | 293,854
12 months or less, Gross unrealized losses | (3,469) | (3,219)
Greater than 12 months, Fair value | 135,578 | 78,279
Greater than 12 months, Gross unrealized losses | (2,820) | (2,489)
Commercial paper |  |
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | 180,899 | 144,741
12 months or less, Gross unrealized losses | (203) | (580)
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 | 923,724 | 604,264
12 months or less, Gross unrealized losses | (11,218) | (6,801)
Greater than 12 months, Fair value | 363,115 | 370,969
Greater than 12 months, Gross unrealized losses | (7,808) | (11,079)
Foreign government bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | 22,269 | 11,284
12 months or less, Gross unrealized losses | (158) | (126)
Greater than 12 months, Fair value | 9,680 | 11,827
Greater than 12 months, Gross unrealized losses | (264) | (390)
Municipal securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | 56,692 |
12 months or less, Gross unrealized losses | (547) |
Greater than 12 months, Fair value | 14,214 |
Greater than 12 months, Gross unrealized losses | (256) |
U.S. agency obligations |  |
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | 43,946 | 4,941
12 months or less, Gross unrealized losses | (223) | (61)
Greater than 12 months, Fair value | 4,967 | 24,461
Greater than 12 months, Gross unrealized losses | (33) | (533)
U.S. treasury securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | 542,832 | 210,246
12 months or less, Gross unrealized losses | (5,613) | (3,661)
Greater than 12 months, Fair value | 218,152 | 63,422
Greater than 12 months, Gross unrealized losses | $ (4,630) | $ (2,353)

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