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Short-term investments
 6 Months Ended
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 LossesFair value
US Government agency bonds$266,452 $68 $(264)$— $266,256 
US Treasury bonds154,620 1 (112)— 154,509 
     Total$421,072 $69 $(376)$— $420,765 
March 31, 2023
Amortized costGross unrealized gainsGross unrealized lossesCredit LossesFair value
US Government agency bonds240,371 187 (203)$— 240,355 
US Treasury bonds196,488 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.