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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) $ in Thousands	12 Months Ended
	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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