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GOODWILL AND INTANGIBLE ASSETS, NET (Tables) | 12 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Rollforward of Carrying Amount of Goodwill by Reportable Segment | The following table displays a rollforward of the carrying amount of goodwill by reportable segment:
| U.S. Consumer |  | Hawthorne |  | Reportable Segment Total
Goodwill | $ | 245.7 |  |  | $ | 617.0 |  |  | $ | 862.7 |
Accumulated impairment losses | (1.8) |  |  | (617.0) |  |  | (618.8) |
Balance at September 30, 2023 | 243.9 |  |  | — |  |  | 243.9 |
Goodwill | 245.7 |  |  | 617.0 |  |  | 862.7 |
Accumulated impairment losses | (1.8) |  |  | (617.0) |  |  | (618.8) |
Balance at September 30, 2024 | 243.9 |  |  | — |  |  | 243.9 |
Goodwill | 245.7 |  |  | 617.0 |  |  | 862.7 |
Accumulated impairment losses | (1.8) |  |  | (617.0) |  |  | (618.8) |
Balance at September 30, 2025 | $ | 243.9 |  |  | $ | — |  |  | $ | 243.9 |
Schedule of Finite-lived Intangible Assets | The following table presents intangible assets, net of accumulated amortization and impairment charges:
| September 30, 2025 |  | September 30, 2024
| Gross Carrying Amount |  | Accumulated Amortization/ Impairment Charges |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization/ Impairment Charges |  | Net Carrying Amount
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | $ | 320.5 |  |  | $ | (275.7) |  |  | $ | 44.8 |  |  | $ | 325.8 |  |  | $ | (272.8) |  |  | $ | 53.0 |
Customer relationships | 246.3 |  |  | (223.8) |  |  | 22.5 |  |  | 253.1 |  |  | (223.9) |  |  | 29.2 |
Technology | 50.1 |  |  | (46.4) |  |  | 3.7 |  |  | 50.2 |  |  | (45.5) |  |  | 4.7 |
Other | 34.5 |  |  | (27.6) |  |  | 6.9 |  |  | 35.0 |  |  | (27.0) |  |  | 8.0 |
Total finite-lived intangible assets, net |  |  |  |  | 77.9 |  |  |  |  |  |  | 94.9 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived trade names |  |  |  |  | 168.2 |  |  |  |  |  |  | 168.2 |
Roundup® marketing agreement amendment |  |  |  |  | 155.7 |  |  |  |  |  |  | 155.7 |
Total indefinite-lived intangible assets |  |  |  |  | 323.9 |  |  |  |  |  |  | 323.9 |
Total intangible assets, net |  |  |  |  | $ | 401.8 |  |  |  |  |  |  | $ | 418.8 |
Schedule of Indefinite-lived Intangible Assets | The following table presents intangible assets, net of accumulated amortization and impairment charges:
| September 30, 2025 |  | September 30, 2024
| Gross Carrying Amount |  | Accumulated Amortization/ Impairment Charges |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization/ Impairment Charges |  | Net Carrying Amount
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Trade names | $ | 320.5 |  |  | $ | (275.7) |  |  | $ | 44.8 |  |  | $ | 325.8 |  |  | $ | (272.8) |  |  | $ | 53.0 |
Customer relationships | 246.3 |  |  | (223.8) |  |  | 22.5 |  |  | 253.1 |  |  | (223.9) |  |  | 29.2 |
Technology | 50.1 |  |  | (46.4) |  |  | 3.7 |  |  | 50.2 |  |  | (45.5) |  |  | 4.7 |
Other | 34.5 |  |  | (27.6) |  |  | 6.9 |  |  | 35.0 |  |  | (27.0) |  |  | 8.0 |
Total finite-lived intangible assets, net |  |  |  |  | 77.9 |  |  |  |  |  |  | 94.9 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived trade names |  |  |  |  | 168.2 |  |  |  |  |  |  | 168.2 |
Roundup® marketing agreement amendment |  |  |  |  | 155.7 |  |  |  |  |  |  | 155.7 |
Total indefinite-lived intangible assets |  |  |  |  | 323.9 |  |  |  |  |  |  | 323.9 |
Total intangible assets, net |  |  |  |  | $ | 401.8 |  |  |  |  |  |  | $ | 418.8 |
Schedule of Future Estimates of Amortization Expense | Amortization expense is estimated to be as follows for the years ending September 30:
2026 | $ | 10.7 |
2027 | 10.1 |
2028 | 8.6 |
2029 | 6.4 |
2030 | 6.2 |

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