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BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands	Aug. 21, 2019	Nov. 01, 2018	Dec. 08, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Goodwill				$ 82,786	$ 64,777	$ 51,705
DrillScan Energy
Business Acquisition [Line Items]
Consideration given	$ 32,700
Contingent consideration	17,700
Fair value of total assets acquired	36,300
Fair value of total liabilities assumed	3,600
Identifiable intangible assets	19,100
Goodwill	$ 14,900
Angus Jamieson Consulting
Business Acquisition [Line Items]
Consideration given		$ 3,400
Goodwill		$ 3,100
MagVAR
Business Acquisition [Line Items]
Identifiable intangible assets			$ 28,700
Goodwill			17,800
Aggregate cash consideration, net of closing adjustments			$ 47,900
Period after which escrow is released to the sellers			12 months
Cash consideration			$ 48,500
MagVAR | Prepaid Expenses and Other
Business Acquisition [Line Items]
Cash consideration placed in escrow			$ 6,000
MagVAR | Restricted Stock
Business Acquisition [Line Items]
Restricted stock awards issued (in shares)			213,904
Grant date fair value of restricted stock			$ 13,100

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