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Segment Information - Revenue from external customers and long lived assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Segment information |  |  |
Assets | $ 6,362,096 |  | $ 6,439,988
Operating revenues | 564,087 | $ 368,590 |
United States |  |  |
Segment information |  |  |
Operating revenues | 500,758 | 300,559 |
Argentina |  |  |
Segment information |  |  |
Operating revenues | 48,829 | 48,082 |
Colombia |  |  |
Segment information |  |  |
Operating revenues | 11,996 | 9,371 |
Other Foreign |  |  |
Segment information |  |  |
Operating revenues | 2,504 | 10,578 |
Operating segment |  |  |
Segment information |  |  |
Assets | 5,663,604 |  | 5,613,084
Operating revenues | 564,307 | 368,798 |
Investments and corporate operations |  |  |
Segment information |  |  |
Assets | 698,490 |  | 826,901
U.S. Land | Operating segment |  |  |
Segment information |  |  |
Assets | 4,956,429 |  | 4,967,074
Offshore | Operating segment |  |  |
Segment information |  |  |
Assets | 103,852 |  | 99,533
International Land | Operating segment |  |  |
Segment information |  |  |
Assets | 421,322 |  | 413,392
Other |  |  |
Segment information |  |  |
Operating revenues | 5,867 | 3,111 |
Other | Operating segment |  |  |
Segment information |  |  |
Assets | 182,001 |  | 133,085
Operating revenues | 6,087 | $ 3,319 |
Continued operations |  |  |
Segment information |  |  |
Assets | 6,362,094 |  | 6,439,985
Discontinued operations. |  |  |
Segment information |  |  |
Assets | $ 2 |  | $ 3

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