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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