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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2020 USD ($) year	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Aug. 21, 2019 USD ($)	Sep. 30, 2017 USD ($)
Impairment Effects on Earnings Per Share [Line Items]
Amortization			$ 7,200	$ 5,800	$ 5,400
Expected amortization in 2021			7,200
Expected amortization in 2022			7,200
Expected amortization in 2023			6,500
Expected amortization in 2024			6,400
Expected amortization in 2025			6,400
Goodwill impairment loss			38,333		4,719
Goodwill		$ 64,777	$ 45,653	$ 82,786	64,777		$ 51,705
Intangible assets impairment loss		900
TerraVici
Impairment Effects on Earnings Per Share [Line Items]
Goodwill impairment loss		4,700
Goodwill		$ 4,700			$ 4,700
DrillScan
Impairment Effects on Earnings Per Share [Line Items]
Increase in goodwill	$ 1,200
Goodwill						$ 14,900
Valuation Technique, Discounted Cash Flow | H&P Technologies | Discount rate
Impairment Effects on Earnings Per Share [Line Items]
Reporting unit, measurement input			14
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

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