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Share-Based Compensation and Other Compensation Plans (Details) $ in Thousands		1 Months Ended	3 Months Ended		12 Months Ended
	Sep. 19, 2025	Jul. 31, 2024 shares	Jun. 30, 2025 USD ($) Plan shares	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2025 USD ($)	Mar. 31, 2025 shares
Share-Based Compensation and Other Compensation Plans [Abstract]
Number of equity incentive plans (in Plan) \| Plan			3
Number of units granted under the plan remain unvested (in Shares) \| shares			0				348,527
Forfeited (in Shares) \| shares			50,732
General and administrative expense \| $			$ 134,019	$ 99,892
Research and development expense \| $			$ 152,919	120,507
RSL 2021 EIP [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
Common shares available for future grants (in Shares) \| shares			37,219,786
Subsidiary Equity Incentive Plans [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
Share-based compensation expense \| $			$ 19,300	14,700
Cash Bonus Program [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
Compensation-related expenses \| $					$ 79,700
General and administrative expense \| $			2,100	6,900
Research and development expense \| $			$ 500	$ 1,800
Performance Restricted Stock Units [Member] \| President and Chief Investment Officer [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
Granted (in Shares) \| shares		80,550
Performance Restricted Stock Units [Member] \| RSL 2021 EIP [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
Granted (in Shares) \| shares			0
Forfeited (in Shares) \| shares			0
Performance Restricted Stock Units [Member] \| RSL Equity Plans [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
Number of units granted under the plan remain unvested (in Shares) \| shares			36,872,465
CVARs [Member] \| March 2020 CVAR Grants [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
Number of shares outstanding (in Shares) \| shares			17,548,368
CVARs [Member] \| November 2021 CVAR Grants [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
Number of shares issued (in Shares) \| shares			297,795
One-Time Cash Retention Awards [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
General and administrative expense \| $			$ 3,700
Cash compensation amount \| $			$ 3,600
One-Time Cash Retention Awards [Member] \| Tranche Two [Member] \| Forecast [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
Percentage of vesting rights	25.00%
One-Time Cash Retention Awards [Member] \| CEO and COO [Member] \| Tranche Two [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
Percentage of vesting rights			75.00%
One-Time Cash Retention Awards [Member] \| President and Chief Investment Officer [Member] \| Forecast [Member]
Share-Based Compensation and Other Compensation Plans [Abstract]
Retention award repayable on recoupment event \| $						$ 15,000