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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 USD ($) year | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Impairment Effects on Earnings Per Share [Line Items] |  |  |
Amortization | $ 7,200 | $ 7,200 | $ 5,800
Expected amortization in 2022 | 7,200 |  |
Expected amortization in 2023 | 6,500 |  |
Expected amortization in 2024 | 6,400 |  |
Expected amortization in 2025 | 6,400 |  |
Expected amortization in 2026 | $ 6,400 |  |
Goodwill impairment loss |  | 38,333 |
DrillScan |  |  |
Impairment Effects on Earnings Per Share [Line Items] |  |  |
Increase in goodwill |  | $ 1,200 |
Valuation Technique, Discounted Cash Flow | H&P Technologies | Expected cash flow period |  |  |
Impairment Effects on Earnings Per Share [Line Items] |  |  |
Reporting unit, measurement input | year | 5 |  |
Valuation Technique, Discounted Cash Flow | H&P Technologies | Measurement input, discount Rate |  |  |
Impairment Effects on Earnings Per Share [Line Items] |  |  |
Reporting unit, measurement input | 14 |  |

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