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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Income Taxes [Line Items]      
Interest expense carryovers $ 18,176 $ 9,257 $ 6,457
Operating loss carryforwards, valuation allowance 62,500 41,600  
Unrecognized tax benefits if unrecognized, the balance of uncertain tax benefits would impact the effective tax rate 4,900 $ 4,900 $ 4,900
Domestic Tax Authority [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards 358,000    
Net operating loss carryforwards not subject to expiration $ 185,900    
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 80.00%    
Interest expense carryovers $ 81,600    
Domestic Tax Authority [Member] | 2027 and 2038 [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards $ 172,100    
Domestic Tax Authority [Member] | Interest Limitation Carryforwards [Member]      
Income Taxes [Line Items]      
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 30.00%    
State and Local Jurisdiction [Member] | 2025 and 2042 [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards $ 195,400    
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 2025    
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 2042