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Basis of Presentation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2015
Basis of presentation            
Cumulative effect of an accounting change to retained earnings net of income tax $ 1,600          
Net income (loss) from continuing operations   $ (21,193) $ 90,899 $ 19,879 $ 448,064  
Adjustment for loss from discontinued operations   7 27 3,872 41  
Operating revenues   366,486 661,445 1,292,524 2,607,902  
Operating costs, excluding depreciation   186,146 350,640 684,401 1,377,202  
Net income   $ (21,200) $ 90,872 $ 16,007 $ 448,023  
Diluted earnings per common share (in dollars per share)   $ (0.20) $ 0.83 $ 0.13 $ 4.10  
Total assets   $ 6,976,519   $ 6,976,519   $ 7,147,242
Total liabilities           2,251,396
Total shareholders' equity   4,701,462   4,701,462   4,895,846
Early termination revenue   80,700 $ 93,000 189,200 $ 188,800  
Abandonments     1,200 900 13,500  
Asset impairment charge   6,250   6,250    
Assets held for sale   21,772   21,772    
Foreign currency gains (losses)   (1,100) (300) (9,400) 1,500  
Previous Accounting Guidance            
Basis of presentation            
Net income (loss) from continuing operations   (2,400)   $ 800    
Adjustment for loss from discontinued operations   (4,000)        
U.S. Land            
Basis of presentation            
Asset impairment charge   $ 6,300        
As Reported            
Basis of presentation            
Operating revenues     659,694   2,599,331  
Operating costs, excluding depreciation     351,670   1,375,241  
Net income     $ 90,860   $ 443,439  
Diluted earnings per common share (in dollars per share)     $ 0.83   $ 4.06  
Total assets           7,152,012
Total liabilities           2,254,560
Total shareholders' equity           4,897,452
Adjustments            
Basis of presentation            
Operating revenues     $ 1,751   $ 8,571  
Operating costs, excluding depreciation     (1,030)   1,961  
Net income     $ 12   $ 4,584  
Diluted earnings per common share (in dollars per share)         $ 0.04  
Total assets           (4,770)
Total liabilities           (3,164)
Total shareholders' equity           $ (1,606)