Cash, Cash Equivalents and Marketable Securities (Tables)
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6 Months Ended |
Sep. 30, 2026 |
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| Cash and Cash Equivalents [Abstract] |
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| Schedule of Cash, Cash Equivalents, and Marketable Securities |
Cash, cash equivalents and marketable securities consisted of the following (in thousands): | | | | | | | | | | | | | September 30, 2026 | | March 31, 2026 | | Cash and cash equivalents: | | | | | Cash | $ | 166,807 | | | $ | 44,526 | | | Money market funds | 1,475,459 | | | 1,374,706 | | | Total cash and cash equivalents | $ | 1,642,266 | | | $ | 1,419,232 | | | Marketable securities: | | | | | U.S. Treasury securities | $ | 1,879,322 | | | $ | 2,124,179 | | | Corporate bonds | 668,432 | | | 748,422 | | | Commercial paper | 17,566 | | | — | | | Total marketable securities, available-for-sale | $ | 2,565,320 | | | $ | 2,872,601 | | | | | | | Total cash, cash equivalents and marketable securities | $ | 4,207,586 | | | $ | 4,291,833 | |
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| Schedule of Unrealized Positions for Marketable Securities |
The following table summarizes the unrealized positions for the Company’s marketable securities (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | As of September 30, 2026 | | Amortized Cost(1) | | Gross Unrealized
Gains | | Gross Unrealized
Losses | | Fair Value | | U.S. Treasury securities | $ | 1,891,260 | | | $ | — | | | $ | (11,938) | | | $ | 1,879,322 | | | Corporate bonds | 672,769 | | | 25 | | | (4,362) | | | 668,432 | | | Commercial paper | 17,574 | | | 2 | | | (10) | | | 17,566 | | | Total marketable securities, available-for-sale | $ | 2,581,603 | | | $ | 27 | | | $ | (16,310) | | | $ | 2,565,320 | |
| | | | | | | | | | | | | | | | | | | | | | | | | As of March 31, 2026 | | Amortized Cost(1) | | Gross Unrealized
Gains | | Gross Unrealized
Losses | | Fair Value | | U.S. Treasury securities | $ | 2,125,053 | | | $ | 538 | | | $ | (1,412) | | | $ | 2,124,179 | | | Corporate bonds | 751,103 | | | — | | | (2,681) | | | 748,422 | | | Total marketable securities, available-for-sale | $ | 2,876,156 | | | $ | 538 | | | $ | (4,093) | | | $ | 2,872,601 | |
(1)Excludes $21.6 million and $19.6 million of accrued interest receivable as of September 30, 2026 and March 31, 2026, respectively, which is included in “Other current assets” on the condensed consolidated balance sheets.
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| Schedule of Marketable Securities as Level 2 Measurements Within the Fair Value Hierarchy |
The estimated fair value of available-for-sale marketable securities by contractual maturity was as follows (in thousands): | | | | | | | | | | | | | September 30, 2026 | | March 31, 2026 | | Due within one year | $ | 1,451,480 | | | $ | 2,145,345 | | | Due after one year but within five years | 1,113,840 | | | 727,256 | | | Total estimated fair value of available-for-sale securities | $ | 2,565,320 | | | $ | 2,872,601 | |
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