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Equity-Based Compensation (Schedule of Time Vested Restricted Stock Units) (Details) - Time vested restricted stock units (TVA)
 12 Months Ended
Sep. 30, 2023
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award  
Nonvested, Beginning of period 54,559
Granted in period 39,920
Vested (17,768)
Forfeited (1,220)
Period increase (decrease) (25,446)
Nonvested, End of period 50,045
Weighted Average Grant Date Fair Value, Beginning balance | $ / shares $ 71.40
Weighted Average Grant Date Fair Value, Granted | $ / shares 85.17
Weighted Average Grant Date Fair Value, Vested | $ / shares 86.21
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 105.13
Weighted Average Grant Date Fair Value, Ending balance | $ / shares $ 112.72