v3.26.1
Cash, Cash Equivalents, and Marketable Securities - Schedule of Unrealized Positions for Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Mar. 31, 2026
Cash, Cash Equivalents, and Marketable Securities [Line Items]    
U.S. Treasury securities, available-for-sale, Amortized Cost $ 2,600,168 $ 2,876,156
U.S. Treasury securities, available-for-sale, Gross Unrealized Gains 25 538
U.S. Treasury securities, available-for-sale, Gross Unrealized Losses (6,567) (4,093)
U.S. Treasury securities, available-for-sale, Fair Value 2,593,626 2,872,601
Accrued interest receivable 21,600 19,600
U.S. Treasury securities    
Cash, Cash Equivalents, and Marketable Securities [Line Items]    
U.S. Treasury securities, available-for-sale, Amortized Cost 1,892,411 2,125,053
U.S. Treasury securities, available-for-sale, Gross Unrealized Gains 25 538
U.S. Treasury securities, available-for-sale, Gross Unrealized Losses (3,705) (1,412)
U.S. Treasury securities, available-for-sale, Fair Value 1,888,731 2,124,179
Corporate bonds    
Cash, Cash Equivalents, and Marketable Securities [Line Items]    
U.S. Treasury securities, available-for-sale, Amortized Cost 707,757 751,103
U.S. Treasury securities, available-for-sale, Gross Unrealized Gains 0 0
U.S. Treasury securities, available-for-sale, Gross Unrealized Losses (2,862) (2,681)
U.S. Treasury securities, available-for-sale, Fair Value $ 704,895 $ 748,422