Quarterly report pursuant to Section 13 or 15(d)

Restricted Investments - Summary of Debt Securities (Details)

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Restricted Investments - Summary of Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost $ 15,903 $ 15,926
Gross Unrealized Gains 0 0
Gross Unrealized Losses 451 847
Fair Value 15,452 15,079
U.S. government securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 6,975 6,869
Gross Unrealized Gains 0 0
Gross Unrealized Losses 187 320
Fair Value 6,788 6,549
Corporate debt securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 5,907 5,931
Gross Unrealized Gains 0 0
Gross Unrealized Losses 134 326
Fair Value 5,773 5,605
Municipal government securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 1,758 1,853
Gross Unrealized Gains 0 0
Gross Unrealized Losses 62 105
Fair Value 1,696 1,748
Agency backed securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 1,263 1,273
Gross Unrealized Gains 0 0
Gross Unrealized Losses 68 96
Fair Value $ 1,195 $ 1,177