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FAIR VALUE MEASUREMENTS - Additional Information (Details) shares in Millions, $ in Millions			12 Months Ended
	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	May 30, 2024	Apr. 22, 2022 board_member nominee director	Aug. 24, 2021 board_member	Aug. 13, 2021	Mar. 17, 2021	Oct. 22, 2019	Dec. 15, 2016
RIV Capital, Inc.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of company nominees added to the board | nominee							4
Number of members of Board of Directors that can be nominated							9	7
Debt Instrument, Ownership After Conversion, Common Shares | shares	123.0
Percentage of ownership after debt conversion		47.00%
RIV Capital, Inc. | The Hawthorne Colective
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of members of Board of Directors that can be nominated | board_member							3
Operating expenses
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible debt other-than-temporary impairments			$ 64.6	$ 101.3	$ 0.0
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%	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%	4.375%					4.375%
Senior Notes | Senior Notes - 4.500%
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (percent)	4.50%	4.50%	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%	5.25%								5.25%
Convertible Notes Payable | RIV Capital, Inc.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Conversion ratio on exchangeable shares						0.23
Convertible debt investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Reductions for securities intended to be sold			$ 99.4	$ 0.0
Cost basis of investment	$ 62.1	$ 225.8	62.1	225.8
Unrealized loss on investment			16.4	140.0
Allowance for credit loss	$ 1.9	$ 101.3	$ 1.9	$ 101.3	$ 0.0
Convertible debt investments | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt term (in years)			5 years
Convertible debt investments | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt term (in years)			2 years 10 months 24 days

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