v3.26.1
Summary of Significant Accounting Policies - Investments in Marketable Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Marketable securities      
Investment income, nonoperating $ 30,400 $ 31,600 $ 25,600
Marketable securities, short-term portion 203,600 202,800  
Marketable securities, long-term portion $ 76,200 $ 26,100  
Marketable Securities, Maturity Date, Start 1 year 1 year  
Marketable Securities, Maturity Date, End 2 years 2 years  
Amortized Cost $ 279,805 $ 228,910  
Allowance for Credit Losses (222) 0  
Net Carrying Amount 279,583 228,910  
Gross Unrealized Losses (528)    
Gross Unrealized Gains   118  
Fair Value 279,055 229,028  
Equity securities 42,300 19,900  
Net unrealized (losses) gains (24,000) 1,000 $ 0
Corporate Bonds      
Marketable securities      
Amortized Cost 112,160 48,837  
Allowance for Credit Losses (160)    
Net Carrying Amount 112,000 48,837  
Gross Unrealized Losses (269)    
Gross Unrealized Gains   97  
Fair Value 111,731 48,934  
U.S. Treasury Notes      
Marketable securities      
Amortized Cost 141,689 35,816  
Allowance for Credit Losses (50)    
Net Carrying Amount 141,639 35,816  
Gross Unrealized Losses (259)    
Gross Unrealized Gains   27  
Fair Value 141,380 35,843  
Commercial Paper      
Marketable securities      
Amortized Cost 25,956 144,257  
Allowance for Credit Losses (12)    
Net Carrying Amount 25,944 144,257  
Gross Unrealized Losses   (6)  
Fair Value $ 25,944 $ 144,251