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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Line Items]    
Effective tax rate (ETR) from continuing operations (1.50%) 9.30%
State net operating loss carryforwards $ 4.5  
Domestic Tax Authority [Member] | 2030-2038 [Member]    
Income Taxes [Line Items]    
Net operating loss carryforwards 560.0  
State and Local Jurisdiction [Member] | 2024-2043 [Member]    
Income Taxes [Line Items]    
Net operating loss carryforwards $ 247.0  
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