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Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment information        
Sales $ 659,694 $ 952,087 $ 2,599,331 $ 2,734,669
Segment Operating Income (Loss) 150,796 293,178 747,763 845,703
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 150,796 293,178 747,763 845,703
Income from asset sales 1,784 2,128 8,854 11,890
Corporate general and administrative costs and corporate depreciation (19,800) (23,394) (64,846) (66,308)
Operating income from continuing operations 132,780 271,912 691,771 791,285
Other income (expense):        
Interest and dividend income 1,602 373 4,436 1,316
Interest expense (6,258) (1,435) (9,290) (4,354)
Gain on sale of investment securities   23,882   45,234
Other (281) 346 88 (31)
Total other income (expense) (4,937) 23,166 (4,766) 42,165
Income from continuing operations before income taxes 127,843 295,078 687,005 833,450
Other        
Segment information        
Sales 3,208 3,987 11,129 9,900
Segment Operating Income (Loss) (2,324) (1,490) (7,440) (6,739)
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (2,324) (1,490) (7,440) (6,739)
Operating segment        
Segment information        
Sales 659,898 952,302 2,599,991 2,735,315
Operating segment | Other        
Segment information        
Sales 3,412 4,202 11,789 10,546
Inter-Segment        
Segment information        
Sales (204) (215) (660) (646)
Inter-Segment | Other        
Segment information        
Sales 204 215 660 646
Contract Drilling:        
Segment information        
Sales 656,486 948,100 2,588,202 2,724,769
Segment Operating Income (Loss) 153,120 294,668 755,203 852,442
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 153,120 294,668 755,203 852,442
Contract Drilling: | U.S. Land        
Segment information        
Sales 494,615 802,279 2,103,125 2,275,744
Segment Operating Income (Loss) 121,734 271,102 664,722 767,116
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 121,734 271,102 664,722 767,116
Contract Drilling: | Offshore        
Segment information        
Sales 55,673 64,554 187,772 186,884
Segment Operating Income (Loss) 14,716 16,996 55,269 54,837
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 14,716 16,996 55,269 54,837
Contract Drilling: | International Land        
Segment information        
Sales 106,198 81,267 297,305 262,141
Segment Operating Income (Loss) 16,670 6,570 35,212 30,489
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 16,670 6,570 35,212 30,489
Contract Drilling: | Operating segment        
Segment information        
Sales 656,486 948,100 2,588,202 2,724,769
Contract Drilling: | Operating segment | U.S. Land        
Segment information        
Sales 494,615 802,279 2,103,125 2,275,744
Contract Drilling: | Operating segment | Offshore        
Segment information        
Sales 55,673 64,554 187,772 186,884
Contract Drilling: | Operating segment | International Land        
Segment information        
Sales $ 106,198 $ 81,267 $ 297,305 $ 262,141