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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Intangible Asset, Acquired, Finite-Lived [Line Items] |  |  |  |
Measurement period adjustments |  | $ 15,775 |  |
Impairments of goodwill |  | 192,186 |  |
Amortization of intangible assets |  | 50,600 | $ 6,400 | $ 6,600
KCA Deutag |  |  |  |
Intangible Asset, Acquired, Finite-Lived [Line Items] |  |  |  |
Deferred tax liabilities | $ 17,400 | 17,400 |  |
Deferred tax liabilities and inventory | 4,000 |  |  |
In-process research and development |  |  |  |
Intangible Asset, Acquired, Finite-Lived [Line Items] |  |  |  |
Property, plant and equipment, net |  | 1,200 |  |
International Solutions |  |  |  |
Intangible Asset, Acquired, Finite-Lived [Line Items] |  |  |  |
Impairments of goodwill | $ 4,400 | 128,400 |  |
Kenera Reporting Unit |  |  |  |
Intangible Asset, Acquired, Finite-Lived [Line Items] |  |  |  |
Impairments of goodwill |  | $ 44,900 |  |
H&P Technologies |  |  |  |
Intangible Asset, Acquired, Finite-Lived [Line Items] |  |  |  |
Fair value in excess of carrying amount | 76.00% | 76.00% |  |
Offshores Solutions |  |  |  |
Intangible Asset, Acquired, Finite-Lived [Line Items] |  |  |  |
Fair value in excess of carrying amount | 20.00% | 20.00% |  |
Other Segments |  |  |  |
Intangible Asset, Acquired, Finite-Lived [Line Items] |  |  |  |
Impairments of goodwill | $ 14,500 |  |  |
Minimum |  |  |  |
Intangible Asset, Acquired, Finite-Lived [Line Items] |  |  |  |
Goodwill multiples for guideline public companies | 250.00% | 250.00% |  |
Goodwill multiples for guideline transactions | 340.00% | 340.00% |  |
Maximum |  |  |  |
Intangible Asset, Acquired, Finite-Lived [Line Items] |  |  |  |
Goodwill multiples for guideline public companies | 550.00% | 550.00% |  |
Goodwill multiples for guideline transactions | 760.00% | 760.00% |  |

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