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Short-term investments | 6 Months Ended
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Sep. 30, 2023
Short-Term Investments [Abstract] |
Short-term investments | Short-term investmentsAs of September 30, 2023 and March 31, 2023, the Company's available-for-sale investments by type consisted of the following:
| September 30, 2023
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Credit Losses |  | Fair value
US Government agency bonds | $ | 266,452 |  |  | $ | 68 |  |  | $ | (264) |  |  | $ | — |  |  | $ | 266,256 |
US Treasury bonds | 154,620 |  |  | 1 |  |  | (112) |  |  | — |  |  | 154,509 |
Total | $ | 421,072 |  |  | $ | 69 |  |  | $ | (376) |  |  | $ | — |  |  | $ | 420,765 |
| March 31, 2023
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Credit Losses |  | Fair value
US Government agency bonds | 240,371 |  |  | 187 |  |  | (203) |  |  | $ | — |  |  | 240,355 |
US Treasury bonds | 196,488 |  |  | 77 |  |  | (124) |  |  | — |  |  | 196,441 |
Total | $ | 436,859 |  |  | $ | 264 |  |  | $ | (327) |  |  | $ | — |  |  | $ | 436,796 |
As of September 30, 2023, available-for-sale securities consisted of investments that mature within one year. As of March 31, 2023, available-for-sale securities consisted of investments that mature within one year, with the exception of certain U.S. Government agency bonds and U.S. Treasury bonds which had maturities between one and two years and an aggregate fair value of $15.1 million.

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- Definition The entire disclosure for investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 321 -Publisher FASB -URI https://asc.fasb.org//321/tableOfContent Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 325 -Publisher FASB -URI https://asc.fasb.org//325/tableOfContent + Details
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- References No definition available. + Details
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