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STOCK REPURCHASE PROGRAM - Narratives (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Jan. 27, 2022
Sep. 30, 2021
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) 61,904,833 60,995,513        
Treasury stock, common (in shares) 5,688,639 5,688,639        
Preferred stock, shares outstanding 0 0        
Stock Repurchase Program, Authorized Amount       $ 2,200   $ 650
Treasury Stock Acquired, Average Cost Per Share     $ 612.13      
Payments for Repurchase of Common Stock $ 0 $ 0 $ 912      
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 1,288          
Treasury Stock            
Shareholders Equity [Line Items]            
Treasury stock, common (in shares) 5,688,639 5,688,639 5,688,639   4,198,226  
Shares repurchased under the program     1,490,413