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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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