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SHAREHOLDER’S EQUITY - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions				12 Months Ended
	Nov. 21, 2023	Jun. 20, 2023	May 04, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Jun. 17, 2023
Accelerated Share Repurchases [Line Items]
Authorized share repurchase amount			$ 1,000,000,000				$ 1,000,000,000
Share repurchase program, authorization period			36 months
Common stock, par value (in dollars per share)				$ 0.01	$ 0.01
Payments for repurchase of common stock				$ 34,700,000	$ 134,000,000.0	$ 125,800,000
Number of shares repurchased (in shares)				5.7	1.4	1.6
Treasury stock repurchases					$ 134,000,000.0	$ 125,800,000
Treasury Stock
Accelerated Share Repurchases [Line Items]
Treasury stock repurchases				$ 434,700,000	$ 134,000,000.0	$ 125,800,000
ASR
Accelerated Share Repurchases [Line Items]
Authorized share repurchase amount							$ 1,000,000,000
Accelerated share repurchase amount		$ (500,000,000)
Common stock, par value (in dollars per share)		$ 0.01
Payments for repurchase of common stock		$ 500,000,000
Number of shares repurchased (in shares)		5.3		5.3	0.0	0.0
Treasury stock, acquired, percentage		80.00%
Treasury stock repurchases				$ 500,000,000.0
ASR | Subsequent Event
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)	1.3
ASR | Treasury Stock
Accelerated Share Repurchases [Line Items]
Treasury stock repurchases		$ 400,000,000		400,000,000.0	$ 0	$ 0
ASR | Additional Paid-in Capital
Accelerated Share Repurchases [Line Items]
Treasury stock repurchases		$ (100,000,000)		$ 100,000,000.0

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