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Income Taxes - Reconciliation Table (Detail)
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 3.70% 3.40% 3.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent 0.00% (0.10%) (0.10%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 0.00% 0.40% 0.30%
Effective Income Tax Rate Reconciliation, Percent, Total 24.70% 24.70% 24.20%