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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Aug. 21, 2019
USD ($)
Goodwill [Line Items]            
Goodwill $ 45,653   $ 45,653   $ 82,786  
Amortization expense 1,800 $ 1,400 3,700 $ 2,800    
Expected amortization in 2020 3,600   3,600      
Expected amortization in 2021 7,200   7,200      
Expected amortization in 2022 7,200   7,200      
Expected amortization in 2023 6,500   6,500      
Expected amortization in 2024 6,400   6,400      
Impairments of goodwill 38,300   38,333      
DrillScan            
Goodwill [Line Items]            
Increase in goodwill $ 1,200   $ 1,200      
Goodwill           $ 14,900
H&P Technologies | Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate            
Goodwill [Line Items]            
Reporting unit, measurement input     0.14