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, 2024	Sep. 30, 2023	Sep. 30, 2022
Units
Beginning balance (in shares)	890	1,010	1,460
Granted (in shares)	480	550	330
Forfeited (in shares)	(180)	(210)	(180)
Vested (in shares)	(210)	(460)	(600)
Ending balance (in shares)	980	890	1,010
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 66.29	$ 77.22	$ 64.00
Granted (in dollars per share)	67.81	52.22	95.30
Forfeited (in dollars per share)	70.71	71.99	78.90
Vested (in dollars per share)	67.73	70.98	55.09
Ending balance (in dollars per share)	$ 65.93	$ 66.29	$ 77.22
Fair Value at Grant Date
Beginning balance	$ 59.2	$ 78.3	$ 93.2
Granted	32.5	28.6	32.3
Forfeited	(12.6)	(15.0)	(13.8)
Vested and exercised	(14.0)	(32.7)	(33.4)
Ending balance	$ 65.1	$ 59.2	$ 78.3