PROPERTY, PLANT AND EQUIPMENT - Schedule of Property Plant and Equipment (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property plant and equipment gross | $ 492,281 | $ 473,785 |
| Accumulated depreciation | (289,644) | (277,835) |
| Total | 202,637 | 195,950 |
| Land, building and building improvements | ||
| Property, Plant and Equipment [Line Items] | ||
| Property plant and equipment gross | 101,877 | 100,415 |
| Machinery and equipment | ||
| Property, Plant and Equipment [Line Items] | ||
| Property plant and equipment gross | 360,058 | 343,029 |
| Leasehold improvements | ||
| Property, Plant and Equipment [Line Items] | ||
| Property plant and equipment gross | 30,346 | 30,341 |
| Construction in Progress | ||
| Property, Plant and Equipment [Line Items] | ||
| Machinery and equipment | $ 22,163 | $ 31,078 |