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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