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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, 2026 | Jan. 31, 2026
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | $ 3,038,325 | $ 677,866
12 months or less, Gross unrealized losses | (18,282) | (1,477)
Greater than 12 months, Fair value | 8,670 | 9,139
Greater than 12 months, Gross unrealized losses | (58) | (59)
Certificates of deposit |  |
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | 27,669 | 27,690
12 months or less, Gross unrealized losses | (41) | (20)
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 | 0 | 4,091
12 months or less, Gross unrealized losses | 0 | (80)
Greater than 12 months, Fair value | 622 | 1,090
Greater than 12 months, Gross unrealized losses | (48) | (51)
Commercial paper |  |
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | 34,796 | 9,960
12 months or less, Gross unrealized losses | (3) | (1)
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 | 1,604,542 | 425,464
12 months or less, Gross unrealized losses | (11,568) | (950)
Greater than 12 months, Fair value | 0 | 0
Greater than 12 months, Gross unrealized losses | 0 | 0
Foreign government bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | 111,351 | 69,877
12 months or less, Gross unrealized losses | (636) | (68)
Greater than 12 months, Fair value | 8,048 | 8,049
Greater than 12 months, Gross unrealized losses | (10) | (8)
Municipal securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | 11,005 | 580
12 months or less, Gross unrealized losses | (72) | 0
Greater than 12 months, Fair value | 0 | 0
Greater than 12 months, Gross unrealized losses | 0 | 0
U.S. treasury securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
12 months or less, Fair value | 1,248,962 | 140,204
12 months or less, Gross unrealized losses | (5,962) | (358)
Greater than 12 months, Fair value | 0 | 0
Greater than 12 months, Gross unrealized losses | $ 0 | $ 0

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