Fair Value Measurements - Schedule of Changes in Fair Value of the Level 3 Assets (Details) - Level 3 - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||
| Balance at beginning of period | $ 167,361 | $ 147,526 |
| Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain (Loss) on Investments | Gain (Loss) on Investments |
| Changes in fair value of investment in Datavant, included in net loss | $ 65,810 | $ 19,835 |
| Balance at end of period | $ 233,171 | $ 167,361 |