Annual report [Section 13 and 15(d), not S-K Item 405]

Income Taxes - Reconciliation of Income Tax Expense (Benefit) - Percent (Details)

v3.26.1
Income Taxes - Reconciliation of Income Tax Expense (Benefit) - Percent (Details)
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Effective Income Tax Rate Reconciliation, Percent    
Federal income tax at the statutory rate (as a percent) 21.00% 21.00%
State and local taxes, net of federal income tax effect (as a percent) (0.50%) 4.30%
Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent    
Other (as a percent) (0.10%)  
Effective Income Tax Rate Reconciliation, Tax Credit, Percent    
Research and development credits (as a percent) (1.80%) 0.60%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent    
Changes in valuation allowances (as a percent) 7.20% (31.50%)
Redeemable noncontrolling interest (as a percent) (13.80%) (8.00%)
True-up (as a percent) (13.10%) 14.30%
Other (as a percent)   (0.20%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent    
Sec 162(m) officers' compensation (as a percent) 3.80%  
Share-based payment awards (as a percent) (4.40%)  
Excess business interest expense (as a percent)   (3.10%)
Other (as a percent) 0.30%  
Total income tax expense (benefit) (as a percent) (1.90%) (2.50%)
United Kingdom    
Effective Income Tax Rate Reconciliation, Percent    
Statutory tax rate difference between United Kingdom and United States (as a percent) 0.60%  
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent    
Other (as a percent) (1.30%)