INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Income Tax Examination [Line Items] | ||
| Valuation allowance increase (decrease) | $ 3,714 | $ 8,997 |
| Undistributed earnings of foreign subsidiaries | 122,964 | |
| Undistributed earnings of foreign subsidiaries, amount previously subjected to federal income tax | 38,703 | |
| Unremitted foreign earnings | 1,514 | 1,896 |
| Deferred tax assets, valuation allowance | 30,703 | 26,989 |
| Potential tax benefits impact on effective tax rate | 1,603 | |
| Liability for uncertainty in income taxes, current | 402 | 310 |
| Domestic Tax Authority | ||
| Income Tax Examination [Line Items] | ||
| Operating loss carryforwards | 0 | 0 |
| Tax credit carryforward amount | 5,933 | 5,933 |
| Non-U.S. Tax Authority | ||
| Income Tax Examination [Line Items] | ||
| Operating loss carryforwards | 75,849 | 63,217 |
| Income Tax Jurisdiction, Domestic State and Local | ||
| Income Tax Examination [Line Items] | ||
| Operating loss carryforwards | $ 221,855 | $ 228,485 |