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RETIREMENT PLANS - ASSET CATERGORY ALLOCATION (Details) | Sep. 30, 2021 | Sep. 30, 2020
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Cash and other |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Actual asset allocation | 0.00% | 0.00%
Fixed income securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Actual asset allocation | 31.00% | 52.00%
Equity securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Actual asset allocation | 69.00% | 48.00%
Minimum | Cash and other |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 0.00% |
Minimum | Fixed income securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 15.00% |
Minimum | Equity securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 45.00% |
Maximum | Cash and other |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 15.00% |
Maximum | Fixed income securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 40.00% |
Maximum | Equity securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 75.00% |

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