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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Sep. 30, 2025
Intangible Asset, Indefinite-Lived [Line Items] |  |  |  |  |
Amortization expense | $ 18.2 | $ 18.7 | $ 56.0 | $ 31.1 |
In Process Research and Development |  |  |  |  |
Intangible Asset, Indefinite-Lived [Line Items] |  |  |  |  |
IPR&D projects reclassified to finite-lived intangible asset |  |  | 0.2 |  |
In Process Research and Development |  |  |  |  |
Intangible Asset, Indefinite-Lived [Line Items] |  |  |  |  |
Indefinite-lived intangible assets, net | $ 1.4 |  | 1.4 |  | $ 3.2
Non-cash impairment charge |  |  | $ 3.0 |  |

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