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Short-Term Investments - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands | Oct. 31, 2023 | Jan. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | $ 3,235,448 | $ 2,244,966
Gross unrealized gains | 462 | 2,555
Gross unrealized losses | (37,340) | (31,358)
Estimated fair value | 3,198,570 | 2,216,163
Certificates of deposits |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 111,560 | 37,998
Gross unrealized gains | 21 | 31
Gross unrealized losses | (98) | (66)
Estimated fair value | 111,483 | 37,963
Asset-backed securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 576,705 | 448,081
Gross unrealized gains | 86 | 585
Gross unrealized losses | (6,289) | (5,708)
Estimated fair value | 570,502 | 442,958
Commercial paper |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 193,975 | 155,097
Gross unrealized gains | 1 | 8
Gross unrealized losses | (203) | (580)
Estimated fair value | 193,773 | 154,525
Corporate notes and bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 1,424,054 | 1,224,195
Gross unrealized gains | 344 | 1,649
Gross unrealized losses | (19,026) | (17,880)
Estimated fair value | 1,405,372 | 1,207,964
Foreign government bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 32,371 | 24,654
Gross unrealized gains | 0 | 13
Gross unrealized losses | (422) | (516)
Estimated fair value | 31,949 | 24,151
Municipal securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 73,217 |
Gross unrealized gains | 6 |
Gross unrealized losses | (803) |
Estimated fair value | 72,420 |
U.S. agency obligations |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 49,169 | 32,995
Gross unrealized gains | 0 | 4
Gross unrealized losses | (256) | (594)
Estimated fair value | 48,913 | 32,405
U.S. treasury securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost | 774,397 | 321,946
Gross unrealized gains | 4 | 265
Gross unrealized losses | (10,243) | (6,014)
Estimated fair value | $ 764,158 | $ 316,197

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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