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COMMITMENTS AND CONTINGENCIES - Narrative (Details)
$ in Thousands
Nov. 15, 2018
USD ($)
segment
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Environmental Exit Cost [Line Items]      
Loss contingency receivable   $ 468  
Number of other parties in agreement | segment 7    
Estimated reserve, remaining   553  
Abrasive particle supply agreement      
Environmental Exit Cost [Line Items]      
Purchase obligation   22,932  
Non-Water Based Carrier Fluid      
Environmental Exit Cost [Line Items]      
Purchase obligation   5,631  
KMG Bernuth      
Environmental Exit Cost [Line Items]      
Loss contingency   $ 1,551 $ 9,494
Estimated remediation cost $ 22,000