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Segment Information - Income by Segment (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Segment information    
Sales $ 487,847 $ 1,060,787
Segment Operating Income (Loss) 55,285 348,453
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income 55,285 348,453
Income from asset sales 4,589 4,173
Corporate general and administrative costs and corporate depreciation (21,204) (22,255)
Operating income from continuing operations 38,670 330,371
Other income (expense):    
Interest and dividend income 733 295
Interest expense (4,524) (590)
Other (261) 314
Total other income (expense) (4,052) 19
Income from continuing operations before income taxes 34,618 330,390
Other    
Segment information    
Sales 3,968 4,180
Segment Operating Income (Loss) (1,304) (1,899)
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income (1,304) (1,899)
Operating segment    
Segment information    
Sales 488,066 1,061,009
Operating segment | Other    
Segment information    
Sales 4,187 4,402
Inter-Segment    
Segment information    
Sales (219) (222)
Inter-Segment | Other    
Segment information    
Sales 219 222
Contract Drilling:    
Segment information    
Sales 483,879 1,056,607
Segment Operating Income (Loss) 56,589 350,352
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income 56,589 350,352
Contract Drilling: | U.S. Land    
Segment information    
Sales 369,805 890,047
Segment Operating Income (Loss) 55,532 318,129
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income 55,532 318,129
Contract Drilling: | Offshore    
Segment information    
Sales 41,880 69,887
Segment Operating Income (Loss) 7,722 21,662
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income 7,722 21,662
Contract Drilling: | International Land    
Segment information    
Sales 72,194 96,673
Segment Operating Income (Loss) (6,665) 10,561
Reconciliation of segment operating income to income from continuing operations before income taxes    
Segment operating income (6,665) 10,561
Contract Drilling: | Operating segment    
Segment information    
Sales 483,879 1,056,607
Contract Drilling: | Operating segment | U.S. Land    
Segment information    
Sales 369,805 890,047
Contract Drilling: | Operating segment | Offshore    
Segment information    
Sales 41,880 69,887
Contract Drilling: | Operating segment | International Land    
Segment information    
Sales $ 72,194 $ 96,673