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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards $ 290,000  
Operating loss carryforwards, utilization period 17 years  
Deferred tax asset, operating loss carryover $ 68,483 $ 0
Returns open to examination, minimum 3 years  
Returns open to examination, maximum 5 years  
Returns open to examination, state impact of federal changes, maximum 2 years  
State    
Operating Loss Carryforwards [Line Items]    
Deferred tax asset, operating loss carryover $ 1,200