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Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Other Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Carrying
Amount    
Financial assets    
Total financial assets $ 9,510 $ 9,449
Financial liabilities    
Total financial liabilities 1,026,290 1,025,349
Carrying
Amount | Senior Notes    
Financial liabilities    
Total financial liabilities   948,945
Carrying
Amount | Junior Subordinated Notes    
Financial liabilities    
Total financial liabilities   76,404
Fair Value    
Financial assets    
Total financial assets 9,366 9,584
Financial liabilities    
Total financial liabilities 1,038,637 1,052,898
Fair Value | Senior Notes    
Financial liabilities    
Total financial liabilities 961,717 976,494
Fair Value | Junior Subordinated Notes    
Financial liabilities    
Total financial liabilities $ 76,920 $ 76,404