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Stock Compensation Plans - Restricted Stock (Details) - MRDP Stock - $ / shares
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of unvested stock awards (in shares) 49,015 26,150 0
Outstanding, September 30, 2022 $ 29.28 $ 27.37 $ 0
Stock awards, granted during period (in shares) 28,815 26,150 0
Granted $ 30.62 $ 27.37  
Stock awards, fordeited during period (in shares) (200) 0  
Forfeited $ 27.37 $ 0  
Stock awards, vested during period (in shares) (5,750) 0  
Issued $ 27.37 $ 0