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INVESTMENT IN UNCONSOLIDATED AFFILIATES (Details) shares in Millions, $ in Millions		12 Months Ended
	Nov. 07, 2023 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jul. 18, 2025 shares	Dec. 18, 2024 USD ($) shares	Dec. 31, 2022	Dec. 31, 2020
Investments in and Advances to Affiliates [Line Items]
Payments to acquire equity interest		$ 0.0	$ 21.4	$ 0.0
Equity in loss of unconsolidated affiliates		2.8	68.1	101.1
Bonnie Plants, LLC
Investments in and Advances to Affiliates [Line Items]
Percent ownership	50.00%						45.00%	50.00%
Payments to acquire equity interest	$ 21.4
Ownership percentage increase (decrease)	5.00%
Equity in loss of unconsolidated affiliates		(5.4)
Pre-tax impairment charges			$ 61.9	$ 94.7
Fluent
Investments in and Advances to Affiliates [Line Items]
Equity in loss of unconsolidated affiliates		$ 8.2
Non-voting exchangeable shares acquired (in shares) | shares						153.1
Non-voting exchangeable shares converted (in shares) | shares					153.1
Percentage of outstanding shares owned		0.25
Loss on exchange of convertible debt investment		$ (7.0)
Initial fair value						$ 10.7
RIV Capital, Inc.
Investments in and Advances to Affiliates [Line Items]
Convertible debt						$ 17.7

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