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Segment Information - Income Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Sep. 30, 2015
Segment information |  |  |  |  |
Total assets | $ 7,025,105 |  | $ 7,025,105 |  | $ 7,147,242
Operating revenues | 438,191 | $ 885,670 | 926,038 | $ 1,946,457 |
United States |  |  |  |  |
Segment information |  |  |  |  |
Operating revenues | 385,977 | 778,637 | 795,483 | 1,734,918 |
Argentina |  |  |  |  |
Segment information |  |  |  |  |
Operating revenues | 35,371 | 46,273 | 85,157 | 74,749 |
Colombia |  |  |  |  |
Segment information |  |  |  |  |
Operating revenues | 4,602 | 22,691 | 11,345 | 46,628 |
Ecuador |  |  |  |  |
Segment information |  |  |  |  |
Operating revenues | 527 | 5,510 | 4,467 | 19,400 |
Other foreign |  |  |  |  |
Segment information |  |  |  |  |
Operating revenues | 11,714 | 32,559 | 29,586 | 70,762 |
Continued operations |  |  |  |  |
Segment information |  |  |  |  |
Total assets | 7,024,875 |  | 7,024,875 |  | 7,139,145
Discontinued operations. |  |  |  |  |
Segment information |  |  |  |  |
Total assets | 230 |  | 230 |  | 8,097
Other |  |  |  |  |
Segment information |  |  |  |  |
Operating revenues | 3,231 | 3,741 | 7,199 | 7,921 |
Operating segment |  |  |  |  |
Segment information |  |  |  |  |
Total assets | 5,888,338 |  | 5,888,338 |  | 6,152,140
Operating revenues | 438,401 | 885,890 | 926,467 | 1,946,899 |
Operating segment | U.S. Land |  |  |  |  |
Segment information |  |  |  |  |
Total assets | 5,210,465 |  | 5,210,465 |  | 5,429,179
Operating segment | Offshore |  |  |  |  |
Segment information |  |  |  |  |
Total assets | 110,446 |  | 110,446 |  | 118,852
Operating segment | International Land |  |  |  |  |
Segment information |  |  |  |  |
Total assets | 530,310 |  | 530,310 |  | 565,712
Operating segment | Other |  |  |  |  |
Segment information |  |  |  |  |
Total assets | 37,117 |  | 37,117 |  | 38,397
Operating revenues | 3,441 | $ 3,961 | 7,628 | $ 8,363 |
Investments and corporate operations |  |  |  |  |
Segment information |  |  |  |  |
Total assets | $ 1,136,537 |  | $ 1,136,537 |  | $ 987,005

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