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Short-Term Investments - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands | Apr. 30, 2024 | Jan. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | $ 3,591,722 | $ 3,321,633
Gross unrealized gains | 1,314 | 13,892
Gross unrealized losses | (25,195) | (11,256)
Estimated fair value | 3,567,841 | 3,324,269
Certificates of deposits |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 98,650 | 94,210
Gross unrealized gains | 23 | 87
Gross unrealized losses | (55) | (14)
Estimated fair value | 98,618 | 94,283
Asset-backed securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 659,618 | 605,852
Gross unrealized gains | 571 | 2,916
Gross unrealized losses | (3,834) | (1,787)
Estimated fair value | 656,355 | 606,981
Commercial paper |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 284,131 | 144,218
Gross unrealized gains | 6 | 47
Gross unrealized losses | (119) | (20)
Estimated fair value | 284,018 | 144,245
Corporate notes and bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 1,719,063 | 1,581,382
Gross unrealized gains | 673 | 8,835
Gross unrealized losses | (12,669) | (5,188)
Estimated fair value | 1,707,067 | 1,585,029
Foreign government bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 54,834 | 50,180
Gross unrealized gains | 0 | 206
Gross unrealized losses | (456) | (180)
Estimated fair value | 54,378 | 50,206
Municipal securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 76,780 | 79,404
Gross unrealized gains | 41 | 301
Gross unrealized losses | (473) | (231)
Estimated fair value | 76,348 | 79,474
U.S. agency obligations |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 55,920 | 49,372
Gross unrealized gains | 0 | 232
Gross unrealized losses | (211) | (12)
Estimated fair value | 55,709 | 49,592
U.S. treasury securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 642,726 | 717,015
Gross unrealized gains | 0 | 1,268
Gross unrealized losses | (7,378) | (3,824)
Estimated fair value | $ 635,348 | $ 714,459

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