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Investments (Tables)
 6 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of 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, 2025
Cost or
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Cash equivalents:
Commercial paper$34,977 $— $(4)$34,973 
Money market funds92,194 — — 92,194 
Total cash equivalents127,171 — (4)127,167 
Marketable securities:
Commercial paper30,587 4 (1)30,590 
Corporate notes and bonds515,522 1,442 (46)516,918 
U.S. government and agency securities161,032 583 (5)161,610 
Total marketable securities707,141 2,029 (52)709,118 
Total cash equivalents and marketable securities$834,312 $2,029 $(56)$836,285 
The cost, gross unrealized gains and losses, and fair value of investments were as follows (in thousands):
As of March 31, 2025
Cost or
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Cash equivalents:
Commercial paper$73,055 $— $(8)$73,047 
Money market funds84,475 — — 84,475 
Total cash equivalents157,530 — (8)157,522 
Marketable securities:
Commercial paper42,860 7 (4)42,863 
Corporate notes and bonds501,202 1,373 (131)502,444 
U.S. government and agency securities160,212 532 (1)160,743 
Total marketable securities704,274 1,912 (136)706,050 
Total cash equivalents and marketable securities$861,804 $1,912 $(144)$863,572 
Schedule of Contractual Maturities of Available-For-Sale Debt Securities
As of September 30, 2025, the contractual maturities of the Company’s available-for-sale debt securities were as follows (in thousands):
Fair Value
Due within one year$491,548 
Due in one to two years252,543 
Total$744,091