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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Goodwill [Line Items]      
Amortization of intangible assets $ 3,048 $ 31 $ 37
Amortization of intangible assets to be recognized in 2025 4,675    
Amortization of intangible assets to be recognized in 2026 3,607    
Amortization of intangible assets to be recognized in 2027 3,076    
Amortization of intangible assets to be recognized in 2028 3,075    
Amortization of intangible assets to be recognized in 2029 and thereafter 691    
MPC Partnership Holdings LLC      
Goodwill [Line Items]      
Goodwill, Acquired During Period $ 69,902