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Stock-Based Compensation - Non-options (Details) - Performance-based stock units
9 Months Ended
Jun. 30, 2023
$ / shares
shares
Share-based Compensation  
Term of award 10 years
Number of PSUs  
Balance, Beginning | shares 2,470
Forfeitures | shares
Balance, Ending | shares 2,470
Vested and exercisable | shares 2,470
Weighted Average Base Price Per Unit  
Balance, Beginning | $ / shares $ 49.97
Forfeitures | $ / shares
Balance, Ending | $ / shares 49.97
Vested and exercisable | $ / shares $ 49.97
Weighted average remaining contractual term, Outstanding 1 year 6 months
Weighted average remaining contractual term, Vested and exercisable 1 year 6 months