PROPERTY, PLANT AND EQUIPMENT, NET - Schedule of Supplemental Non-Cash Activities (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Property, Plant, and Equipment [Abstract] | ||
| Purchases of Property, plant and equipment in Accounts payable | $ 9.6 | $ 4.5 |
| Purchases of Property, plant and equipment in Accrued expenses and other current liabilities | 7.4 | 2.5 |
| Transfers of Property, plant and equipment from Inventory | $ 7.4 | $ 5.2 |