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Segment Information - Income by Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Segment information        
Sales $ 438,191 $ 885,670 $ 926,038 $ 1,946,457
Segment Operating Income (Loss) 62,203 251,261 117,488 599,714
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 62,203 251,261 117,488 599,714
Income from asset sales 2,684 2,855 7,273 7,028
Corporate general and administrative costs and corporate depreciation (23,266) (22,790) (44,470) (45,045)
Operating income (loss) from continuing operations 41,621 231,326 80,291 561,697
Other income (expense):        
Interest and dividend income 799 2,564 1,532 2,859
Interest expense (5,721) (2,600) (10,245) (3,190)
Other 653 55 392 369
Total other income (expense) (4,269) 19 (8,321) 38
Income (loss) from continuing operations before income taxes 37,352 231,345 71,970 561,735
Other        
Segment information        
Sales 3,231 3,741 7,199 7,921
Segment Operating Income (Loss) (1,349) (3,217) (2,653) (5,116)
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (1,349) (3,217) (2,653) (5,116)
Operating segment        
Segment information        
Sales 438,401 885,890 926,467 1,946,899
Operating segment | Other        
Segment information        
Sales 3,441 3,961 7,628 8,363
Inter-Segment        
Segment information        
Sales (210) (220) (429) (442)
Inter-Segment | Other        
Segment information        
Sales 210 220 429 442
Contract Drilling:        
Segment information        
Sales 434,960 881,929 918,839 1,938,536
Segment Operating Income (Loss) 63,552 254,478 120,141 604,830
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 63,552 254,478 120,141 604,830
Contract Drilling: | U.S. Land        
Segment information        
Sales 349,283 718,463 719,088 1,608,510
Segment Operating Income (Loss) 62,521 224,859 118,053 542,988
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 62,521 224,859 118,053 542,988
Contract Drilling: | Offshore        
Segment information        
Sales 34,325 62,428 76,205 132,315
Segment Operating Income (Loss) 3,299 19,040 11,021 40,702
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 3,299 19,040 11,021 40,702
Contract Drilling: | International Land        
Segment information        
Sales 51,352 101,038 123,546 197,711
Segment Operating Income (Loss) (2,268) 10,579 (8,933) 21,140
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (2,268) 10,579 (8,933) 21,140
Contract Drilling: | Operating segment        
Segment information        
Sales 434,960 881,929 918,839 1,938,536
Contract Drilling: | Operating segment | U.S. Land        
Segment information        
Sales 349,283 718,463 719,088 1,608,510
Contract Drilling: | Operating segment | Offshore        
Segment information        
Sales 34,325 62,428 76,205 132,315
Contract Drilling: | Operating segment | International Land        
Segment information        
Sales $ 51,352 $ 101,038 $ 123,546 $ 197,711