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Basis of Presentation and New Significant Accounting Policy - Narrative (Details)
$ in Thousands
9 Months Ended
Jun. 30, 2023
USD ($)
segment
Sep. 30, 2022
USD ($)
Basis of Presentation and New Significant Accounting Policy    
Number of Operating Segments | segment 2  
Investments - held-to-maturity | $ $ 2,351 $ 0