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Fair value of financial assets and liabilities (Details) - Recurring - USD ($) $ in Thousands | Sep. 30, 2023 | Mar. 31, 2023
--- | --- | ---
Fair value of financial assets and liabilities |  |
Short-term investments | $ 481,602 | $ 558,251
Money market funds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents | 60,837 | 121,455
US Government Agency bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments | 266,256 | 240,355
US Treasury bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments | 154,509 | 196,441
Level 1 |  |
Fair value of financial assets and liabilities |  |
Short-term investments | 0 | 0
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents | 0 | 0
Level 1 | US Government Agency bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments | 0 | 0
Level 1 | US Treasury bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments | 0 | 0
Level 2 |  |
Fair value of financial assets and liabilities |  |
Short-term investments | 481,602 | 558,251
Level 2 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents | 60,837 | 121,455
Level 2 | US Government Agency bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments | 266,256 | 240,355
Level 2 | US Treasury bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments | 154,509 | 196,441
Level 3 |  |
Fair value of financial assets and liabilities |  |
Short-term investments | 0 | 0
Level 3 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Cash equivalents | 0 | 0
Level 3 | US Government Agency bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments | 0 | 0
Level 3 | US Treasury bonds |  |
Fair value of financial assets and liabilities |  |
Short-term investments | $ 0 | $ 0

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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 No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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