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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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