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Segment Information - Total assets (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Segment information |  |
Assets | $ 6,261,792 | $ 6,439,988
Operating segment |  |
Segment information |  |
Assets | 5,623,400 | 5,613,084
Investments and corporate operations |  |
Segment information |  |
Assets | 638,392 | 826,901
U.S. Land | Operating segment |  |
Segment information |  |
Assets | 4,940,149 | 4,967,074
Offshore | Operating segment |  |
Segment information |  |
Assets | 101,350 | 99,533
International Land | Operating segment |  |
Segment information |  |
Assets | 399,898 | 413,392
Other | Operating segment |  |
Segment information |  |
Assets | 182,003 | 133,085
Continued operations |  |
Segment information |  |
Assets | $ 6,261,792 | 6,439,985
Discontinued operations. |  |
Segment information |  |
Assets |  | $ 3

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