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RETIREMENT PLANS - FAIR VALUE (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Plan assets    
Entity's stock included in plan assets $ 4  
Pension plan assets at the fair value    
Fair value measurements 10,012 $ 9,098
Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements $ 10,012 $ 9,098
Cash and other    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Actual asset allocation 2.00% 1.00%
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 24.00% 31.00%
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 74.00% 68.00%
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 $ 221 $ 124
Cash | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 221 124
Certificates of deposit    
Pension plan assets at the fair value    
Fair value measurements 230 496
Certificates of deposit | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 230 496
Corporate bonds    
Pension plan assets at the fair value    
Fair value measurements 3 210
Corporate bonds | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 3 210
Fixed income exchange-traded funds    
Pension plan assets at the fair value    
Fair value measurements 2,135 2,036
Fixed income exchange-traded funds | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 2,135 2,036
Preferred securities    
Pension plan assets at the fair value    
Fair value measurements   51
Preferred securities | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements   51
Equity securities exchange-traded funds    
Pension plan assets at the fair value    
Fair value measurements 567 553
Equity securities exchange-traded funds | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 567 553
Equities    
Pension plan assets at the fair value    
Fair value measurements 6,856 5,628
Equities | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements $ 6,856 $ 5,628