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INCOME TAXES - Income Tax Expense Reconciliation (Detail)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Statutory tax rate	21.00%	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent	3.70%	4.00%	5.30%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	0.90%	1.30%	1.70%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Percent	(1.60%)	(1.20%)	(1.20%)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent	(2.90%)	(3.60%)	(2.30%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	0.00%	1.10%	(0.20%)
Effective Income Tax Rate Reconciliation, Percent	21.10%	22.60%	24.30%

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Effective Income Tax Rate Reconciliation, TCJA, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to amortization.

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Percentage of reported income tax benefit (expense) from difference to income tax expense (benefit) computed by applying statutory federal (national) income tax rate to pretax income (loss) from continuing operation, attributable to other reconciling items. Excludes state and local income tax expense (benefit), federal tax expense (benefit), statutory income tax expense (benefit) outside of country of domicile, tax credit, nondeductible expense, deduction, income tax settlement, income tax contingency, and cross-border tax law.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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