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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Income Taxes [Line Items]        
Effective tax rate (ETR) from continuing operations (1.20%) 3.90% 3.70% (0.20%)
State net operating loss carryforwards $ 0   $ 0  
Domestic Tax Authority [Member] | 2030-2038 [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards 277,600,000   277,600,000  
State and Local Jurisdiction [Member] | 2024-2043 [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards $ 150,600,000   $ 150,600,000  
Minimum [Member] | Domestic Tax Authority [Member]        
Income Taxes [Line Items]        
Operating loss carryforwards, expiration year     2030  
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     2043