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Segment Information - Income by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Segment information |  |  |  |
Total Sales | $ 577,484 | $ 405,283 | $ 1,141,571 | $ 773,873
Segment Operating Income (Loss) | 24,814 | (58,049) | 54,501 | (83,377)
Other |  |  |  |
Segment information |  |  |  |
Total Sales | 9,313 | 3,324 | 15,180 | 6,435
Segment Operating Income (Loss) | (7,015) | (1,134) | (14,332) | (3,183)
Operating segment |  |  |  |
Segment information |  |  |  |
Total Sales | 577,771 | 405,491 | 1,142,078 | 774,289
Operating segment | Other |  |  |  |
Segment information |  |  |  |
Total Sales | 9,565 | 3,532 | 15,652 | 6,851
Inter-Segment |  |  |  |
Segment information |  |  |  |
Total Sales | (287) | (208) | (507) | (416)
Inter-Segment | Other |  |  |  |
Segment information |  |  |  |
Total Sales | 252 | 208 | 472 | 416
Contract Drilling: |  |  |  |
Segment information |  |  |  |
Total Sales | 568,171 | 401,959 | 1,126,391 | 767,438
Segment Operating Income (Loss) | 31,829 | (56,915) | 68,833 | (80,194)
Contract Drilling: | U.S. Land |  |  |  |
Segment information |  |  |  |
Total Sales | 482,729 | 330,967 | 944,369 | 594,603
Segment Operating Income (Loss) | 27,075 | (51,850) | 51,820 | (82,738)
Contract Drilling: | Offshore |  |  |  |
Segment information |  |  |  |
Total Sales | 32,983 | 36,235 | 66,349 | 70,047
Segment Operating Income (Loss) | 5,449 | 5,912 | 14,174 | 12,696
Contract Drilling: | International Land |  |  |  |
Segment information |  |  |  |
Total Sales | 52,459 | 34,757 | 115,673 | 102,788
Segment Operating Income (Loss) | (695) | (10,977) | 2,839 | (10,152)
Contract Drilling: | Operating segment |  |  |  |
Segment information |  |  |  |
Total Sales | 568,206 | 401,959 | 1,126,426 | 767,438
Contract Drilling: | Operating segment | U.S. Land |  |  |  |
Segment information |  |  |  |
Total Sales | 482,764 | 330,967 | 944,404 | 594,603
Contract Drilling: | Operating segment | Offshore |  |  |  |
Segment information |  |  |  |
Total Sales | 32,983 | 36,235 | 66,349 | 70,047
Contract Drilling: | Operating segment | International Land |  |  |  |
Segment information |  |  |  |
Total Sales | 52,459 | $ 34,757 | 115,673 | $ 102,788
Contract Drilling: | Inter-Segment |  |  |  |
Segment information |  |  |  |
Total Sales | 35 |  | 35 |
Contract Drilling: | Inter-Segment | U.S. Land |  |  |  |
Segment information |  |  |  |
Total Sales | $ 35 |  | $ 35 |

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