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Short-term investments (Tables) | 6 Months Ended
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Sep. 30, 2023
Short-Term Investments [Abstract] |
Schedule of short-term investments | As 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 |

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