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GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Millions | Jul. 02, 2022 | Sep. 30, 2021 | Jul. 03, 2021
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Indefinite-lived Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | $ 323.9 | $ 323.9 |
Total intangible assets, net | 627.1 | 709.6 | $ 677.8
Intangible Assets [Line Items] |  |  |
Net Carrying Amount | 303.2 | 385.7 |
Total indefinite-lived intangible assets | 323.9 | 323.9 |
Intangible assets, net | 627.1 | 709.6 | $ 677.8
Tradenames |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | 168.2 | 168.2 |
Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | 168.2 | 168.2 |
Roundup® marketing agreement amendment |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | 155.7 | 155.7 |
Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | 155.7 | 155.7 |
Tradenames |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 322.1 | 293.4 |
Accumulated Amortization/ Impairment Charges | (151.0) | (73.3) |
Net Carrying Amount | 171.1 | 220.1 |
Customer accounts |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 252.9 | 228.3 |
Accumulated Amortization/ Impairment Charges | (143.1) | (91.7) |
Net Carrying Amount | 109.8 | 136.6 |
Technology |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 49.2 | 49.2 |
Accumulated Amortization/ Impairment Charges | (43.0) | (41.3) |
Net Carrying Amount | 6.2 | 7.9 |
Other |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 35.6 | 35.3 |
Accumulated Amortization/ Impairment Charges | (19.5) | (14.2) |
Net Carrying Amount | $ 16.1 | $ 21.1 |

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