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Segment Information - Income by Segment (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Segment information    
Operating revenue $ 368,590 $ 487,847
Segment Operating Income (Loss) (25,328) 55,285
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income (loss) (25,328) 55,285
Income from asset sales 842 4,589
Corporate general and administrative costs and corporate depreciation (24,678) (21,204)
Operating income (loss) from continuing operations (49,164) 38,670
Other income (expense):    
Interest and dividend income 990 733
Interest expense (5,055) (4,524)
Other 387 (261)
Total other income (expense) (3,678) (4,052)
Income (loss) from continuing operations before income taxes (52,842) 34,618
Other    
Segment information    
Operating revenue 3,111 3,968
Segment Operating Income (Loss) (2,049) (1,304)
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income (loss) (2,049) (1,304)
Operating segment    
Segment information    
Operating revenue 368,798 488,066
Operating segment | Other    
Segment information    
Operating revenue 3,319 4,187
Inter-Segment    
Segment information    
Operating revenue (208) (219)
Inter-Segment | Other    
Segment information    
Operating revenue 208 219
Contract Drilling:    
Segment information    
Operating revenue 365,479 483,879
Segment Operating Income (Loss) (23,279) 56,589
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income (loss) (23,279) 56,589
Contract Drilling: | U.S. Land    
Segment information    
Operating revenue 263,636 369,805
Segment Operating Income (Loss) (30,888) 55,532
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income (loss) (30,888) 55,532
Contract Drilling: | Offshore    
Segment information    
Operating revenue 33,812 41,880
Segment Operating Income (Loss) 6,784 7,722
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income (loss) 6,784 7,722
Contract Drilling: | International Land    
Segment information    
Operating revenue 68,031 72,194
Segment Operating Income (Loss) 825 (6,665)
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income (loss) 825 (6,665)
Contract Drilling: | Operating segment    
Segment information    
Operating revenue 365,479 483,879
Contract Drilling: | Operating segment | U.S. Land    
Segment information    
Operating revenue 263,636 369,805
Contract Drilling: | Operating segment | Offshore    
Segment information    
Operating revenue 33,812 41,880
Contract Drilling: | Operating segment | International Land    
Segment information    
Operating revenue $ 68,031 $ 72,194