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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Goodwill [Line Items]          
Amortization expense $ 1,800   $ 1,400 $ 5,500 $ 4,200
Expected amortization in 2020 1,800     1,800  
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       $ 38,333  
DrillScan          
Goodwill [Line Items]          
Increase in goodwill   $ 1,200      
H&P Technologies | Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate          
Goodwill [Line Items]          
Reporting unit, measurement input       0.14