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SEGMENT INFORMATION - Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Net sales $ 3,413.1 $ 3,552.7 $ 3,551.3
Intangible asset amortization (12.3) (15.7) (25.2)
Total impairment, restructuring and other (83.8) (146.3) (466.1)
Equity in loss of unconsolidated affiliates (2.8) (68.1) (101.1)
Interest expense (128.8) (158.8) (178.1)
Other non-operating expense, net (5.3) (5.5) 0.3
Reportable segment total      
Segment Reporting Information [Line Items]      
Net sales 3,159.5 3,308.4 3,311.0
Depreciation and amortization 67.5 72.9 84.0
Share-based compensation 40.7 42.4 41.5
U.S. Consumer | Operating Segments      
Segment Reporting Information [Line Items]      
Net sales 2,993.7 3,013.7 2,843.7
Adjusted cost of sales 2,008.4 2,147.8 2,056.6
Adjusted selling, general and administrative 392.1 347.8 334.3
Other segment items 20.6 20.1 (1.3)
Depreciation and amortization 54.5 56.2 58.2
Share-based compensation 38.1 37.1 35.3
Hawthorne | Operating Segments      
Segment Reporting Information [Line Items]      
Net sales 165.8 294.7 467.3
Adjusted cost of sales 129.6 258.6 446.7
Adjusted selling, general and administrative 34.0 51.8 67.3
Other segment items (0.6) (1.5) 1.4
Depreciation and amortization 13.0 16.7 25.8
Share-based compensation 2.6 5.3 6.2
Other non-reportable operating segment      
Segment Reporting Information [Line Items]      
Net sales 253.6 244.3 240.3
Continuing Operations      
Segment Reporting Information [Line Items]      
Segment Profit (Loss) 221.7 (23.6) (453.3)
Intangible asset amortization (12.3) (15.7) (25.2)
Total impairment, restructuring and other (83.8) (146.3) (466.0)
Equity in loss of unconsolidated affiliates (2.8) (68.1) (101.1)
Interest expense (128.8) (158.8) (178.1)
Other non-operating expense, net (5.3) (5.5) 0.3
Continuing Operations | Operating Segments      
Segment Reporting Information [Line Items]      
Segment Profit (Loss) 575.4 483.8 406.0
Continuing Operations | Corporate      
Segment Reporting Information [Line Items]      
Segment Profit (Loss) (133.4) (117.7) (101.6)
Continuing Operations | U.S. Consumer | Operating Segments      
Segment Reporting Information [Line Items]      
Segment Profit (Loss) 572.6 498.0 454.1
Continuing Operations | Hawthorne | Operating Segments      
Segment Reporting Information [Line Items]      
Segment Profit (Loss) 2.8 (14.2) (48.1)
Continuing Operations | Other non-reportable operating segment | Operating Segments      
Segment Reporting Information [Line Items]      
Segment Profit (Loss) $ 12.7 $ 4.7 $ 12.4