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Restricted Investments - Amortized Cost and Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Amortized Cost    
Due within one year $ 2,852  
Due after one year through three years 4,572  
Due after three years 10,436  
Amortized Cost 17,860 $ 17,986
Fair Value    
Due within one year 2,844  
Due after one year through three years 4,495  
Due after three years 10,134  
Fair Value $ 17,473 $ 18,020