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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

X

- 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

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- Definition

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+ References

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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

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