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RETIREMENT PLANS - FAIR VALUE (Details) - USD ($)
Sep. 30, 2019
Sep. 30, 2018
Plan assets    
Entity's stock included in plan assets $ 1,000  
Pension plan assets at the fair value    
Fair value measurements 10,192,000 $ 10,012,000
Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements $ 10,192,000 $ 10,012,000
Cash and other    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Actual asset allocation 0.00% 2.00%
Cash and other | Maximum    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Target allocation 25.00%  
Cash and other | Minimum    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Target allocation 0.00%  
Fixed income securities    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Actual asset allocation 38.00% 24.00%
Fixed income securities | Maximum    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Target allocation 40.00%  
Fixed income securities | Minimum    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Target allocation 15.00%  
Equity securities    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Actual asset allocation 62.00% 74.00%
Equity securities | Maximum    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Target allocation 75.00%  
Equity securities | Minimum    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Target allocation 45.00%  
Cash    
Pension plan assets at the fair value    
Fair value measurements $ 4,000 $ 221,000
Cash | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 4,000 221,000
Certificates of deposit    
Pension plan assets at the fair value    
Fair value measurements   230,000
Certificates of deposit | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements   230,000
Corporate bonds    
Pension plan assets at the fair value    
Fair value measurements 1,000 3,000
Corporate bonds | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 1,000 3,000
Fixed income exchange-traded funds    
Pension plan assets at the fair value    
Fair value measurements 3,859,000 2,135,000
Fixed income exchange-traded funds | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 3,859,000 2,135,000
Equity securities exchange-traded funds    
Pension plan assets at the fair value    
Fair value measurements 547,000 567,000
Equity securities exchange-traded funds | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 547,000 567,000
Equities    
Pension plan assets at the fair value    
Fair value measurements 5,781,000 6,856,000
Equities | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements $ 5,781,000 $ 6,856,000