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Cash Equivalents and Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands | Jan. 31, 2025 | Jan. 31, 2024
--- | --- | ---
Cash equivalents: |  |
Amortized Cost | $ 2,251,048 | $ 1,331,709
Gross Unrealized Gains | 92 | 1
Gross Unrealized Losses | 0 | (2)
Estimated Fair Value | 2,251,140 | 1,331,708
Investments: |  |
Amortized Cost | 2,664,694 | 3,005,041
Gross Unrealized Gains | 2,944 | 2,958
Gross Unrealized Losses | (2,289) | (8,193)
Estimated Fair Value | 2,665,349 | 2,999,806
Amortized Cost | 4,915,742 | 4,336,750
Gross Unrealized Gains | 3,036 | 2,959
Gross Unrealized Losses | (2,289) | (8,195)
Estimated Fair Value | 4,916,489 | 4,331,514
Corporate notes and bonds |  |
Investments: |  |
Amortized Cost | 1,559,893 | 1,549,151
Gross Unrealized Gains | 2,177 | 1,959
Gross Unrealized Losses | (1,520) | (3,394)
Estimated Fair Value | 1,560,550 | 1,547,716
U.S. government and agency securities |  |
Investments: |  |
Amortized Cost | 609,937 | 877,496
Gross Unrealized Gains | 528 | 574
Gross Unrealized Losses | (727) | (4,653)
Estimated Fair Value | 609,738 | 873,417
Commercial paper |  |
Investments: |  |
Amortized Cost | 307,752 | 353,525
Gross Unrealized Gains | 142 | 154
Gross Unrealized Losses | (38) | (131)
Estimated Fair Value | 307,856 | 353,548
Certificates of deposit |  |
Investments: |  |
Amortized Cost | 187,112 | 224,869
Gross Unrealized Gains | 97 | 271
Gross Unrealized Losses | (4) | (15)
Estimated Fair Value | 187,205 | 225,125
Money market funds |  |
Cash equivalents: |  |
Amortized Cost | 1,741,089 | 533,211
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 1,741,089 | 533,211
U.S. government securities |  |
Cash equivalents: |  |
Amortized Cost | 388,578 | 742,235
Gross Unrealized Gains | 92 | 1
Gross Unrealized Losses | 0 | (2)
Estimated Fair Value | 388,670 | 742,234
Time deposits |  |
Cash equivalents: |  |
Amortized Cost | 113,851 | 56,263
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 113,851 | $ 56,263
Corporate notes and bonds |  |
Cash equivalents: |  |
Amortized Cost | 4,466 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 4,466 |
Commercial paper |  |
Cash equivalents: |  |
Amortized Cost | 3,064 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | $ 3,064 |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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