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Investments (Tables)
 6 Months Ended
Sep. 30, 2023
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, 2023
Cost or
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Cash equivalents:
Commercial paper$9,988 $— $(3)$9,985 
Money market funds71,842 — — 71,842 
Total cash equivalents81,830 — (3)81,827 
Marketable securities:
Asset-backed securities6,673 1 (12)6,662 
Certificates of deposit11,965 1 (15)11,951 
Commercial paper99,773 4 (41)99,736 
Corporate notes and bonds66,351 1 (266)66,086 
Sovereign bonds7,746 — (269)7,477 
U.S. government and agency securities440,905 15 (11,381)429,539 
Total marketable securities633,413 22 (11,984)621,451 
Total cash equivalents and marketable securities$715,243 $22 $(11,987)$703,278 
The cost, gross unrealized gains and losses, and fair value of investments were as follows (in thousands):
As of March 31, 2023
Cost or
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Cash equivalents:
Money market funds$126,275 $— $— $126,275 
Total cash equivalents126,275 — — 126,275 
Marketable securities:
Asset-backed securities7,271 — (71)7,200 
Certificates of deposit27,380 — (80)27,300 
Commercial paper78,609 6 (126)78,489 
Corporate notes and bonds119,241 49 (778)118,512 
Sovereign bonds7,744 — (360)7,384 
U.S. government and agency securities461,584 12 (17,509)444,087 
Total marketable securities701,829 67 (18,924)682,972 
Total cash equivalents and marketable securities$828,104 $67 $(18,924)$809,247 
Contractual Maturities of Available-For-Sale Debt Securities
As of September 30, 2023, the contractual maturities of the Company’s available-for-sale debt securities were as follows (in thousands):
Fair Value
Due within one year$583,534 
Due in one to two years41,240 
Asset-backed securities6,662 
Total$631,436 
Gross Unrealized Losses and Fair Values of Investments in an Unrealized Loss Position
The following tables summarize the gross unrealized losses and fair values of investments in an unrealized loss position, aggregated by security type and length of time that the individual securities have been in a continuous unrealized loss position (in thousands):
As of September 30, 2023
Less than 12 months12 months or greaterTotal
Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Asset-backed securities$4,569 $(8)$1,018 $(4)$5,587 $(12)
Certificates of deposit11,006 (15)— — 11,006 (15)
Commercial paper96,131 (44)— — 96,131 (44)
Corporate notes and bonds55,618 (139)6,241 (127)61,859 (266)
Sovereign bonds— — 7,477 (269)7,477 (269)
U.S. government and agency securities
42,925 (75)362,967 (11,306)405,892 (11,381)
Total
$210,249 $(281)$377,703 $(11,706)$587,952 $(11,987)
As of March 31, 2023
Less than 12 months12 months or greaterTotal
Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Asset-backed securities$2,601 $(12)$4,599 $(59)$7,200 $(71)
Certificates of deposit27,018 (80)— — 27,018 (80)
Commercial paper70,681 (126)— — 70,681 (126)
Corporate notes and bonds42,575 (113)58,766 (665)101,341 (778)
Sovereign bonds— — 7,384 (360)7,384 (360)
U.S. government and agency securities
— — 439,748 (17,509)439,748 (17,509)
Total
$142,875 $(331)$510,497 $(18,593)$653,372 $(18,924)