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Investments (Tables)
 6 Months Ended
Sep. 30, 2024
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, 2024
Cost or
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Cash equivalents:
Commercial paper$14,949 $2 $(1)$14,950 
Money market funds123,972 — — 123,972 
Total cash equivalents138,921 2 (1)138,922 
Marketable securities:
Commercial paper49,639 59 — 49,698 
Corporate notes and bonds460,784 2,990 (41)463,733 
U.S. government and agency securities107,308 571 — 107,879 
Total marketable securities617,731 3,620 (41)621,310 
Total cash equivalents and marketable securities$756,652 $3,622 $(42)$760,232 
The cost, gross unrealized gains and losses, and fair value of investments were as follows (in thousands):
As of March 31, 2024
Cost or
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Cash equivalents:
Corporate notes and bonds$1,180 $— $— $1,180 
Money market funds83,049 — — 83,049 
Total cash equivalents84,229 — — 84,229 
Marketable securities:
Asset-backed securities121 — — 121 
Commercial paper70,804 1 (50)70,755 
Corporate notes and bonds225,880 133 (191)225,822 
Sovereign bonds7,749 — (73)7,676 
U.S. government and agency securities365,123 2 (3,384)361,741 
Total marketable securities669,677 136 (3,698)666,115 
Total cash equivalents and marketable securities$753,906 $136 $(3,698)$750,344 
Contractual Maturities of Available-For-Sale Debt Securities
As of September 30, 2024, the contractual maturities of the Company’s available-for-sale debt securities were as follows (in thousands):
Fair Value
Due within one year$397,730 
Due in one to two years238,530 
Total$636,260 
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, 2024
Less than 12 months12 months or greaterTotal
Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Commercial paper$4,496 $(1)$— $— $4,496 $(1)
Corporate notes and bonds47,935 (41)— — 47,935 (41)
Total
$52,431 $(42)$— $— $52,431 $(42)
As of March 31, 2024
Less than 12 months12 months or greaterTotal
Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Asset-backed securities$— $— $121 $— $121 $— 
Commercial paper67,336 (50)— — 67,336 (50)
Corporate notes and bonds131,443 (191)— — 131,443 (191)
Sovereign bonds— — 7,676 (73)7,676 (73)
U.S. government and agency securities
81,130 (139)259,784 (3,245)340,914 (3,384)
Total
$279,909 $(380)$267,581 $(3,318)$547,490 $(3,698)