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Employee Benefit Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Retirement Benefits [Abstract]      
Defined benefit plan, contributions by employer $ 2.4 $ 1.7 $ 1.5
Maximum contribution per employee percentage of regular compensation 75.00%    
Maximum contribution per employee percentage of incentive compensation 100.00%    
Obligation under the plan $ 2.4 2.2  
Cash surrender value of life insurance policies $ 3.3 $ 2.8