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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |
Revenues | $ 614,657 | $ 740,598
Segment Operating Income (Loss) | 31,368 | 54,289
U.S. Land |  |
Segment Reporting Information [Line Items] |  |
Revenues | 508,828 | 619,425
Offshore |  |
Segment Reporting Information [Line Items] |  |
Revenues | 40,255 | 36,910
International Land |  |
Segment Reporting Information [Line Items] |  |
Revenues | 46,462 | 66,287
H&P Technologies |  |
Segment Reporting Information [Line Items] |  |
Revenues | 15,853 | 14,736
Other |  |
Segment Reporting Information [Line Items] |  |
Revenues | 3,259 | 3,240
Operating Segment |  |
Segment Reporting Information [Line Items] |  |
Revenues | 614,657 | 740,598
Segment Operating Income (Loss) | 60,345 | 84,719
Operating Segment | U.S. Land |  |
Segment Reporting Information [Line Items] |  |
Revenues | 508,828 | 619,425
Segment Operating Income (Loss) | 56,690 | 75,748
Operating Segment | Offshore |  |
Segment Reporting Information [Line Items] |  |
Revenues | 40,255 | 36,910
Segment Operating Income (Loss) | 6,328 | 7,168
Operating Segment | International Land |  |
Segment Reporting Information [Line Items] |  |
Revenues | 46,462 | 66,287
Segment Operating Income (Loss) | 3,115 | 6,630
Operating Segment | H&P Technologies |  |
Segment Reporting Information [Line Items] |  |
Revenues | 18,552 | 14,736
Segment Operating Income (Loss) | (4,551) | (6,381)
Operating Segment | Other |  |
Segment Reporting Information [Line Items] |  |
Revenues | 10,999 | 3,240
Segment Operating Income (Loss) | (1,237) | 1,554
Intersegment |  |
Segment Reporting Information [Line Items] |  |
Revenues | (10,439) | 0
Segment Operating Income (Loss) |  | 0
Intersegment | U.S. Land |  |
Segment Reporting Information [Line Items] |  |
Revenues | 0 | 0
Intersegment | Offshore |  |
Segment Reporting Information [Line Items] |  |
Revenues | 0 | 0
Intersegment | International Land |  |
Segment Reporting Information [Line Items] |  |
Revenues | 0 | 0
Intersegment | H&P Technologies |  |
Segment Reporting Information [Line Items] |  |
Revenues | 2,699 | 0
Intersegment | Other |  |
Segment Reporting Information [Line Items] |  |
Revenues | $ 7,740 | $ 0

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