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STOCK REPURCHASE PROGRAM - Narratives (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Nov. 30, 2025 | Nov. 08, 2017
Shareholders Equity [Line Items] |  |  |  |  |  |
Common stock, authorized (in shares) |  | 224,400,000 | 224,400,000 |  |  |
Common stock, par or stated value (in usd per share) |  | $ 0.01 | $ 0.01 |  |  |
Preferred stock, shares authorized |  | 149,600,000 |  |  |  |
Preferred stock, par value |  | $ 0.01 |  |  |  |
Common stock, issued (in shares) |  | 62,465,317 | 61,904,833 |  |  |
Treasury stock, common (in shares) |  | 6,089,675 | 5,688,639 |  |  |
Preferred stock, shares outstanding |  | 0 | 0 |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 2,200 |  |  |  | $ 650
Treasury Stock Acquired, Average Cost Per Share |  | $ 1,246.71 |  |  |  |
Payments for Repurchase of Common Stock |  | $ 500 | $ 0 | $ 0 |  |
Shares repurchased under the program |  | 401,036 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 788 |  |  |  |
Subsequent Event |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 5,000 |
Treasury Stock Acquired, Average Cost Per Share | $ 1,249.9 |  |  |  |  |
Payments for Repurchase of Common Stock | $ 100 |  |  |  |  |
Shares repurchased under the program | 79,959 |  |  |  |  |

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