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Share-Based Compensation and Other Compensation Plans - Schedule of Long-Term Equity Incentive Awards Approved (Details) - shares	1 Months Ended
	Jul. 31, 2025	Jul. 31, 2024
Performance Restricted Stock Units (at max) \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		14,450,000
Performance Restricted Stock Units (at max) \| President and Chief Investment Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		17,000,000
Performance Restricted Stock Units (at max) \| President and Immunovant CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares)		11,900,000
Performance Restricted Stock Units (at max) \| President and Vant Chair
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	11,900,000
Restricted Stock Units \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		2,754,821
Restricted Stock Units \| President and Chief Investment Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		1,836,547
Restricted Stock Units \| President and Immunovant CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		204,000
Restricted Stock Units \| President and Vant Chair
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	1,836,547
Stock Options \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, stock options (in shares)		0
Stock Options \| President and Chief Investment Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, stock options (in shares)		0
Stock Options \| President and Immunovant CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, stock options (in shares)		409,000
Stock Options \| President and Vant Chair
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, stock options (in shares)	0