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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Income Taxes [Line Items]    
Interest expense carryovers $ 9,258 $ 6,457
Operating loss carryforwards, valuation allowance 41,600 21,100
Unrecognized tax benefits if unrecognized, the balance of uncertain tax benefits would impact the effective tax rate 4,900 $ 4,900
Domestic Tax Authority [Member]    
Income Taxes [Line Items]    
Net operating loss carryforwards not subject to expiration $ 194,200  
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 80.00%  
Interest expense carryovers $ 41,700  
Domestic Tax Authority [Member] | 2027-2038 [Member]    
Income Taxes [Line Items]    
Net operating loss carryforwards 511,700  
State and Local Jurisdiction [Member] | 2024-2044 [Member]    
Income Taxes [Line Items]    
Net operating loss carryforwards $ 226,900  
Minimum [Member] | Domestic Tax Authority [Member]    
Income Taxes [Line Items]    
Operating loss carryforwards, expiration year 2027  
Minimum [Member] | State and Local Jurisdiction [Member]    
Income Taxes [Line Items]    
Operating loss carryforwards, expiration year 2024  
Maximum [Member] | Domestic Tax Authority [Member]    
Income Taxes [Line Items]    
Operating loss carryforwards, expiration year 2038  
Maximum [Member] | State and Local Jurisdiction [Member]    
Income Taxes [Line Items]    
Operating loss carryforwards, expiration year 2044