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Investments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands | Oct. 31, 2023 | Jan. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 5,978,660 | $ 4,764,845
Unrealized Gains | 660 | 1,694
Unrealized Losses | (32,529) | (17,359)
Aggregate Fair Value | 5,946,791 | 4,749,180
Included in Cash and cash equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 659,919 | 594,864
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | (1)
Aggregate Fair Value | 659,919 | 594,863
Included in Marketable securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,318,741 | 4,169,980
Unrealized Gains | 660 | 1,694
Unrealized Losses | (32,529) | (17,357)
Aggregate Fair Value | 5,286,872 | 4,154,317
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,307,535 | 2,455,739
Unrealized Gains | 51 | 77
Unrealized Losses | (9,121) | (6,765)
Aggregate Fair Value | 2,298,465 | 2,449,051
U.S. agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 787,767 | 325,664
Unrealized Gains | 254 | 0
Unrealized Losses | (2,376) | (3,874)
Aggregate Fair Value | 785,645 | 321,790
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,771,472 | 966,801
Unrealized Gains | 355 | 1,617
Unrealized Losses | (21,031) | (6,715)
Aggregate Fair Value | 1,750,796 | 961,703
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,111,886 | 1,016,641
Unrealized Gains | 0 | 0
Unrealized Losses | (1) | (5)
Aggregate Fair Value | $ 1,111,885 | $ 1,016,636

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