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INCOME TAXES - Income Tax Expense Reconciliation (Detail)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]      
Statutory tax rate 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent 4.00% 5.30% 5.50%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 1.30% 1.70% 0.10%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 0.50% 0.30% 1.50%
Effective Income Tax Rate Reconciliation, Withholding Taxes 0.20% 0.20% 1.20%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent 0.10% 0.30% (1.00%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Percent (1.20%) (1.20%) (2.00%)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent (3.60%) (2.30%) (2.80%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent 0.30% (1.00%) (0.30%)
Effective Income Tax Rate Reconciliation, Percent 22.60% 24.30% 23.20%