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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation by Jurisdiction (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Tax credits      
Research and development credit $ (7.7)    
Nontaxable or nondeductible items      
Excess officer’s compensation 12.5    
Share based compensation 4.8    
Change in valuation allowance (32.1)    
Other 1.7    
State and local income taxes, net of federal benefit 0.0    
Total $ (0.1) $ 3.4 $ (0.2)
Percent      
Federal income tax rate   21.00% 21.00%
Tax credits      
Research and development credit (12.20%)    
Nontaxable or nondeductible items      
Excess officer’s compensation 0.198    
Share based compensation 7.60%    
Change in valuation allowance (50.80%) (12.00%) (13.50%)
Other 2.70% (1.70%) 0.00%
State and local income taxes, net of federal benefit (0.10%) 0.80% 1.70%
Effects of rates different than statutory   0.80% 1.00%
Effective income tax rate (0.20%) (2.90%) 0.00%
United States      
Amount      
Federal income tax rate $ 13.2    
Percent      
Federal income tax rate 21.00%    
United Kingdom      
Nontaxable or nondeductible items      
Change in valuation allowance $ 3.0    
Other (3.5)    
Foreign tax effects (1.5)    
Impairment $ 9.9    
Nontaxable or nondeductible items      
Change in valuation allowance 4.80%    
Other (5.50%)    
Effects of rates different than statutory (2.40%)    
Impairment 15.70%    
Other foreign jurisdictions      
Nontaxable or nondeductible items      
Foreign tax effects $ (0.5)    
Nontaxable or nondeductible items      
Effects of rates different than statutory (0.80%)