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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 |  |  |

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