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Cash, Cash Equivalents, and Investments - Carrying Value of Investments (Details) - USD ($) $ in Thousands | Apr. 30, 2024 | Jan. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | $ 210,905 | $ 208,277
Unrealized Gain (Loss), Net | (663) | (99)
Estimated Fair Value | 210,242 | 208,178
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 56,750 | 50,012
Unrealized Gain (Loss), Net | (67) | 24
Estimated Fair Value | 56,683 | 50,036
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 17,128 | 2,887
Unrealized Gain (Loss), Net | (26) | (1)
Estimated Fair Value | 17,102 | 2,886
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 108,958 | 131,395
Unrealized Gain (Loss), Net | (474) | (136)
Estimated Fair Value | 108,484 | 131,259
U.S. Government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 28,069 | 23,983
Unrealized Gain (Loss), Net | (96) | 14
Estimated Fair Value | $ 27,973 | $ 23,997

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- Definition Amount, before tax, of unrealized gain (loss) 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/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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