SHAREHOLDERS' EQUITY, Common Stock Outstanding Roll Forward (Details) - shares	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance beginning of period (in shares)	208,700,000	215,000,000.0	208,769,095	215,100,000
Repurchases of common stock under the Board of Directors’ common stock repurchase authorization (in shares)	(1,700,000)	(3,700,000)	(3,100,000)	(5,000,000.0)
Issuances due to vesting of RSUs, employee stock purchases, and exercise of stock options, net of forfeitures (in shares)	300,000	300,000	1,600,000	1,500,000
Balance end of period (in shares)	207,318,494	211,600,000	207,318,494	211,600,000