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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