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Investments (Tables)
 6 Months Ended
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments
The cost, gross unrealized gains and losses, and fair value of investments are as follows (in thousands):
As of September 30, 2022
Cost or
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Cash equivalents:
Money market funds$4,412 $— $— $4,412 
Total cash equivalents4,412 — — 4,412 
Marketable securities:
Asset-backed securities6,568 — (116)6,452 
Certificates of deposit15,414 — (77)15,337 
Commercial paper44,112 — (112)44,000 
Corporate notes and bonds131,504 — (2,376)129,128 
Sovereign bonds7,741 — (488)7,253 
U.S. government and agency securities499,867 — (25,720)474,147 
Total marketable securities705,206 — (28,889)676,317 
Total cash equivalents and marketable securities$709,618 $— $(28,889)$680,729 
The cost, gross unrealized gains and losses, and fair value of investments were as follows (in thousands):
As of March 31, 2022
Cost or
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Cash equivalents:
Commercial paper$2,686 $— $— $2,686 
Money market funds20,072 — — 20,072 
Total cash equivalents22,758 — — 22,758 
Marketable securities:
Asset-backed securities7,791 — (51)7,740 
Commercial paper9,436 — (53)9,383 
Corporate notes and bonds129,900 — (1,796)128,104 
Sovereign bonds8,770 — (334)8,436 
U.S. government and agency securities549,901 — (18,260)531,641 
Total marketable securities705,798 — (20,494)685,304 
Total cash equivalents and marketable securities$728,556 $— $(20,494)$708,062 
Contractual Maturities of Available-For-Sale Debt Securities
As of September 30, 2022, the contractual maturities of the Company’s available-for-sale debt securities were as follows (in thousands):
Fair Value
Due within one year$248,716 
Due in one year to three years427,601 
Total$676,317