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Short-term investments (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Mar. 31, 2023
US Government Agency bonds |  |
Short-term investments |  |
Amortized cost | $ 266,452 | $ 240,371
Gross unrealized gains | 68 | 187
Gross unrealized losses | (264) | (203)
Credit Losses | 0 | 0
Fair value | 266,256 | 240,355
US Treasury bonds |  |
Short-term investments |  |
Amortized cost | 154,620 | 196,488
Gross unrealized gains | 1 | 77
Gross unrealized losses | (112) | (124)
Credit Losses | 0 | 0
Fair value | 154,509 | 196,441
Short-term investments |  |
Short-term investments |  |
Amortized cost | 421,072 | 436,859
Gross unrealized gains | 69 | 264
Gross unrealized losses | (376) | (327)
Credit Losses | 0 | 0
Fair value | $ 420,765 | 436,796
Securities with maturities between one to two years |  | $ 15,100

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