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Segment Information - Income by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Segment information |  |
Operating revenue | $ 564,087 | $ 368,590
Segment Operating Income (Loss) | 29,687 | (25,328)
Depreciation and amortization | 143,267 | 133,847
Reconciliation of segment operating income to income from continuing operations before income taxes |  |
Segment operating income (loss) | 29,687 | (25,328)
Income from asset sales | 5,565 | 842
Corporate general and administrative costs and corporate depreciation | (31,732) | (24,678)
Operating income (loss) from continuing operations | 3,520 | (49,164)
Other income (expense): |  |
Interest and dividend income | 1,724 | 990
Interest expense | (5,773) | (5,055)
Other | 530 | 387
Total other income (expense) | (3,519) | (3,678)
Income (loss) from continuing operations before income taxes | 1 | (52,842)
Other |  |
Segment information |  |
Operating revenue | 5,867 | 3,111
Segment Operating Income (Loss) | (7,317) | (2,049)
Reconciliation of segment operating income to income from continuing operations before income taxes |  |
Segment operating income (loss) | (7,317) | (2,049)
Operating segment |  |
Segment information |  |
Operating revenue | 564,307 | 368,798
Operating segment | Other |  |
Segment information |  |
Operating revenue | 6,087 | 3,319
Inter-Segment |  |
Segment information |  |
Operating revenue | (220) | (208)
Inter-Segment | Other |  |
Segment information |  |
Operating revenue | 220 | 208
Contract Drilling: |  |
Segment information |  |
Operating revenue | 558,220 | 365,479
Segment Operating Income (Loss) | 37,004 | (23,279)
Reconciliation of segment operating income to income from continuing operations before income taxes |  |
Segment operating income (loss) | 37,004 | (23,279)
Contract Drilling: | U.S. Land |  |
Segment information |  |
Operating revenue | 461,640 | 263,636
Segment Operating Income (Loss) | 24,745 | (30,888)
Reconciliation of segment operating income to income from continuing operations before income taxes |  |
Segment operating income (loss) | 24,745 | (30,888)
Contract Drilling: | Offshore |  |
Segment information |  |
Operating revenue | 33,366 | 33,812
Segment Operating Income (Loss) | 8,725 | 6,784
Reconciliation of segment operating income to income from continuing operations before income taxes |  |
Segment operating income (loss) | 8,725 | 6,784
Contract Drilling: | International Land |  |
Segment information |  |
Operating revenue | 63,214 | 68,031
Segment Operating Income (Loss) | 3,534 | 825
Reconciliation of segment operating income to income from continuing operations before income taxes |  |
Segment operating income (loss) | 3,534 | 825
Contract Drilling: | Operating segment |  |
Segment information |  |
Operating revenue | 558,220 | 365,479
Contract Drilling: | Operating segment | U.S. Land |  |
Segment information |  |
Operating revenue | 461,640 | 263,636
Contract Drilling: | Operating segment | Offshore |  |
Segment information |  |
Operating revenue | 33,366 | 33,812
Contract Drilling: | Operating segment | International Land |  |
Segment information |  |
Operating revenue | $ 63,214 | $ 68,031

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