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ACQUISITIONS AND INVESTMENTS (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	Dec. 31, 2020	Nov. 11, 2020	Jan. 02, 2021	Sep. 30, 2020	Dec. 28, 2019
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity interest	$ 100.7
Loans receivable, carrying value	66.4
Gain from change in fair value of loans receivable			$ 12.5
Loans receivable, fair value			78.9
Investment, estimated fair value	$ 23.3
Investment in unconsolidated affiliates			$ 202.9	$ 0.0	$ 0.0
AeroGrow | SMG Growing Media, Inc.
Schedule of Equity Method Investments [Line Items]
Equity ownership percentage		80.50%
AeroGrow
Schedule of Equity Method Investments [Line Items]
Cash consideration per share (USD per share)		$ 3.00
Cash consideration		$ 20.1
Bonnie Plants
Schedule of Equity Method Investments [Line Items]
Equity ownership percentage	50.00%
Investment in unconsolidated affiliates	$ 202.9

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