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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Total assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 5,897,379 | $ 6,214,867
Operating Segment |  |
Segment Reporting Information [Line Items] |  |
Assets | 5,342,234 | 5,656,332
Investments and Corporate Operations |  |
Segment Reporting Information [Line Items] |  |
Assets | 555,145 | 558,535
U.S. Land | Operating Segment |  |
Segment Reporting Information [Line Items] |  |
Assets | 4,742,605 | 5,012,378
Offshore | Operating Segment |  |
Segment Reporting Information [Line Items] |  |
Assets | 100,490 | 105,439
International Land | Operating Segment |  |
Segment Reporting Information [Line Items] |  |
Assets | 318,195 | 362,033
H&P Technologies | Operating Segment |  |
Segment Reporting Information [Line Items] |  |
Assets | 149,712 | 146,957
Other | Operating Segment |  |
Segment Reporting Information [Line Items] |  |
Assets | 31,232 | 29,525
Continued operations |  |
Segment Reporting Information [Line Items] |  |
Assets | 5,897,379 | 6,214,867
Discontinued operations |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 0 | $ 0

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