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SHARE BASED COMPENSATION - Schedule of RSU Activity (Details) - Restricted Stock Units - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Units      
Beginning balance (in shares) 980 890 1,010
Granted (in shares) 330 480 550
Forfeited (in shares) (240) (180) (210)
Vested and exercised (in shares) (130) (210) (460)
Ending balance (in shares) 940 980 890
Weighted Average Grant Date Fair Value      
Beginning balance (in dollars per share) $ 65.93 $ 66.29 $ 77.22
Granted (in dollars per share) 83.84 67.81 52.22
Forfeited (in dollars per share) 84.47 70.71 71.99
Vested and exercised (in dollars per share) 72.82 67.73 70.98
Ending balance (in dollars per share) $ 66.46 $ 65.93 $ 66.29
Fair Value at Grant Date      
Beginning balance $ 65.1 $ 59.2 $ 78.3
Granted 27.6 32.5 28.6
Forfeited (20.5) (12.6) (15.0)
Vested and exercised (9.7) (14.0) (32.7)
Ending balance $ 62.5 $ 65.1 $ 59.2