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Short-term investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Short-term investments |  |
Amortized cost | $ 59,857 | $ 372,377
Gross unrealized gains | 9 | 349
Gross unrealized losses | (1) | (41)
Credit Losses | 0 | 0
Fair value | 59,865 | 372,685
US Government Agency bonds |  |
Short-term investments |  |
Amortized cost | 3,985 | 84,807
Gross unrealized gains | 0 | 15
Gross unrealized losses | (1) | (18)
Credit Losses | 0 | 0
Fair value | 3,984 | 84,804
US Treasury bonds |  |
Short-term investments |  |
Amortized cost | 55,872 | 287,570
Gross unrealized gains | 9 | 334
Gross unrealized losses | 0 | (23)
Credit Losses | 0 | 0
Fair value | $ 55,881 | $ 287,881

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