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Investments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands | Oct. 31, 2021 | Jan. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,839,775 | $ 2,569,269
Unrealized Gains | 91 | 1,654
Unrealized Losses | (1,121) | (73)
Aggregate Fair Value | 2,838,745 | 2,570,850
Included in Cash and cash equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 715,486 | 440,678
Unrealized Gains | 1 | 0
Unrealized Losses | (2) | 0
Aggregate Fair Value | 715,485 | 440,678
Included in Marketable securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,124,289 | 2,128,591
Unrealized Gains | 90 | 1,654
Unrealized Losses | (1,119) | (73)
Aggregate Fair Value | 2,123,260 | 2,130,172
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,246,777 | 1,054,146
Unrealized Gains | 54 | 205
Unrealized Losses | (294) | (10)
Aggregate Fair Value | 1,246,537 | 1,054,341
U.S. agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 232,209 | 504,298
Unrealized Gains | 2 | 196
Unrealized Losses | (383) | (49)
Aggregate Fair Value | 231,828 | 504,445
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 426,074 | 346,563
Unrealized Gains | 35 | 1,253
Unrealized Losses | (444) | (14)
Aggregate Fair Value | 425,665 | 347,802
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 934,715 | 664,262
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Aggregate Fair Value | $ 934,715 | $ 664,262

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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