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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
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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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