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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Aug. 13, 2021	Mar. 17, 2021	Oct. 22, 2019	Dec. 15, 2016
Operating expenses
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible debt investment impairment		$ 64.6	$ 101.3
Senior Notes | Senior Notes due 2031 – 4.000%
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (percent)	4.00%	4.00%			4.00%
Senior Notes | Senior Notes due 2032 – 4.375%
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (percent)	4.375%	4.375%		4.375%
Senior Notes | Senior Notes due 2029 - 4.500%
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (percent)	4.50%	4.50%				4.50%
Senior Notes | Senior Notes due 2026 – 5.250%
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (percent)	5.25%	5.25%					5.25%
Convertible debt investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Reductions for securities intended to be sold	$ 0.0	$ 99.4
Cost basis of investment	44.4	62.1
Unrealized loss on investment	19.8	16.4
Allowance for credit loss	$ 1.9	$ 1.9	$ 101.3
Convertible debt investments | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt term (in years)	4 years

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