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POST EMPLOYMENT BENEFITS - Fair value of total plan assets by asset category (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Fair value of total plan assets by asset category |  |
Total | $ 14,385 | $ 21,269
Cash [Member] |  |
Fair value of total plan assets by asset category |  |
Total | 409 |
Investment grade corporate bonds [Member] |  |
Fair value of total plan assets by asset category |  |
Total | 4,408 |
Multi-asset fund [Member] |  |
Fair value of total plan assets by asset category |  |
Total | 9,568 |
Fair Value, Inputs, Level 1 [Member] |  |
Fair value of total plan assets by asset category |  |
Total | 409 |
Fair Value, Inputs, Level 1 [Member] | Cash [Member] |  |
Fair value of total plan assets by asset category |  |
Total | 409 |
Fair Value, Inputs, Level 2 [Member] |  |
Fair value of total plan assets by asset category |  |
Total | 13,976 |
Fair Value, Inputs, Level 2 [Member] | Investment grade corporate bonds [Member] |  |
Fair value of total plan assets by asset category |  |
Total | 4,408 |
Fair Value, Inputs, Level 2 [Member] | Multi-asset fund [Member] |  |
Fair value of total plan assets by asset category |  |
Total | $ 9,568 |

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