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RETIREMENT PLANS - FAIR VALUE (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Plan assets    
Entity's stock included in plan assets $ 4  
Pension plan assets at the fair value    
Fair value measurements 8,195 $ 6,488
Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements $ 8,195 $ 6,488
Cash and cash equivalents    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Target allocation, minimum 0.00%  
Target allocation, maximum 30.00%  
Actual asset allocation 7.00% 9.00%
Fixed income securities    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Target allocation, minimum 20.00%  
Target allocation, maximum 60.00%  
Actual asset allocation 23.00% 22.00%
Equity securities    
Entity's year-end target allocation, by asset category, and the actual asset allocations    
Target allocation, minimum 30.00%  
Target allocation, maximum 70.00%  
Actual asset allocation 70.00% 69.00%
Cash    
Pension plan assets at the fair value    
Fair value measurements $ 571 $ 621
Cash | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 571 621
Corporate bonds    
Pension plan assets at the fair value    
Fair value measurements 316 354
Corporate bonds | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 316 354
Fixed income exchange-traded funds    
Pension plan assets at the fair value    
Fair value measurements 1,414 819
Fixed income exchange-traded funds | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 1,414 819
Preferred securities    
Pension plan assets at the fair value    
Fair value measurements 184 230
Preferred securities | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 184 230
Equity securities exchange- traded funds    
Pension plan assets at the fair value    
Fair value measurements 818 764
Equity securities exchange- traded funds | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements 818 764
Equities    
Pension plan assets at the fair value    
Fair value measurements 4,892 3,700
Equities | Quoted Prices in Active Markets (Level 1)    
Pension plan assets at the fair value    
Fair value measurements $ 4,892 $ 3,700