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POST EMPLOYMENT BENEFITS - Fair value of total plan assets by asset category (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | ---
Fair value of total plan assets by asset category |  |  |
Total | $ 18,687 | $ 15,993 | $ 14,385
Cash |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 432 | 431 |
Investment grade corporate bonds |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 9,300 | 14,184 |
Government bonds |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 7,360 |  |
Multi-asset fund |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 1,595 | 1,378 |
Level 1 |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 432 | 431 |
Level 1 | Cash |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 432 | 431 |
Level 1 | Investment grade corporate bonds |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 0 | 0 |
Level 1 | Government bonds |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 0 |  |
Level 1 | Multi-asset fund |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 0 | 0 |
Level 2 |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 18,255 | 15,562 |
Level 2 | Cash |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 0 | 0 |
Level 2 | Investment grade corporate bonds |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 9,300 | 14,184 |
Level 2 | Government bonds |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 7,360 |  |
Level 2 | Multi-asset fund |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 1,595 | 1,378 |
Level 3 |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 0 | 0 |
Level 3 | Cash |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 0 | 0 |
Level 3 | Investment grade corporate bonds |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 0 | 0 |
Level 3 | Government bonds |  |  |
Fair value of total plan assets by asset category |  |  |
Total | 0 |  |
Level 3 | Multi-asset fund |  |  |
Fair value of total plan assets by asset category |  |  |
Total |  | $ 0 |

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