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STOCK-BASED COMPENSATION - Weighted Average Assumptions used to Estimate Fair Value of all Options at Grant Date using Black-Scholes-Merton Option-Pricing Model (Detail)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Risk-free interest rate, minimum	4.14%	3.45%	1.47%
Risk-free interest rate, maximum	4.68%	4.20%	2.97%
Expected life of options	6 years 6 months	6 years 6 months	6 years 6 months
Expected dividend yield of stock	0.00%	0.00%	0.00%
Expected volatility of stock	33.50%	32.50%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum	4.14%	3.45%	1.47%
Risk-free interest rate, maximum	4.68%	4.20%	2.97%
Expected life of options	6 years 6 months	6 years 6 months	6 years 6 months
Expected dividend yield of stock	0.00%	0.00%	0.00%
Expected volatility of stock	33.50%	32.50%
Minimum
Share-Based Payment Arrangement [Abstract]
Expected volatility of stock			37.00%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility of stock			37.00%
Maximum
Share-Based Payment Arrangement [Abstract]
Expected volatility of stock			38.00%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility of stock			38.00%

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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