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DEBT - Capped Call Transactions Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
	May 23, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Payments for premium on equity component of convertible debt		$ 0.0	$ 25.2	$ 0.0
Capped Call Transactions | Convertible Debt
Debt Instrument [Line Items]
Convertible, conversion price (in dollars per share)	$ 121.86	$ 121.51
Stock price trigger (in dollars per share)	$ 159.36	158.90
Convertible, equity component (in shares)	0.7
3.375% Exchangeable Notes, due June 1, 2029 | Convertible Debt
Debt Instrument [Line Items]
Convertible, conversion price (in dollars per share)		$ 121.51
Payments for premium on equity component of convertible debt	$ 25.2

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