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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 |

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