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Debt - Components of Convertible Debt (Details) - USD ($)
Mar. 31, 2026
Jun. 30, 2025
May 31, 2024
Feb. 28, 2021
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [Abstract]        
Unamortized debt issuance costs $ (14,100,000) $ (17,400,000)    
Unamortized debt discount (19,000,000.0) (22,700,000)    
Net carrying amount 1,332,500,000      
5.50% Convertible Senior Notes due 2029 | Convertible senior notes        
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [Abstract]        
Principal 350,000,000.0 350,000,000.0 $ 350,000,000.0  
Unamortized debt issuance costs (5,400,000) (6,400,000)    
Net carrying amount 344,600,000 343,600,000    
0.00% Convertible Senior Notes due 2026 | Convertible senior notes        
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [Abstract]        
Principal 199,000,000.0 199,000,000.0   $ 1,000,000,000.0
Unamortized debt issuance costs 0 (500,000)    
Principal payments (199,000,000.0) 0    
Net carrying amount 0 198,500,000    
Convertible Senior Notes Outstanding on November 16, 2025 | Convertible senior notes | Term Loan Facility        
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [Abstract]        
Principal 1,000,000,000 1,000,000,000    
Unamortized debt issuance costs (8,700,000) (10,400,000)    
Principal payments (17,500,000) (10,000,000.0)    
Unamortized debt discount (19,000,000.0) (22,700,000)    
Net carrying amount $ 954,800,000 $ 956,900,000