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Segment Information - Income by Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment information        
Sales $ 366,486 $ 661,445 $ 1,292,524 $ 2,607,902
Segment Operating Income (Loss) 20,709 153,093 138,197 752,807
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 20,709 153,093 138,197 752,807
Income from asset sales 547 1,791 7,820 8,819
Corporate general and administrative costs and corporate depreciation (34,512) (19,835) (78,982) (64,880)
Operating income (loss) from continuing operations (13,256) 135,049 67,035 696,746
Other income (expense):        
Interest and dividend income 778 1,588 2,310 4,447
Interest expense (6,407) (6,136) (16,652) (9,326)
Other 534 (281) 926 88
Total other income (expense) (5,095) (4,829) (13,416) (4,791)
Income (loss) from continuing operations before income taxes (18,351) 130,220 53,619 691,955
Other        
Segment information        
Sales 2,983 3,208 10,182 11,129
Segment Operating Income (Loss) (2,186) (2,324) (4,839) (7,440)
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (2,186) (2,324) (4,839) (7,440)
Operating segment        
Segment information        
Sales 366,692 661,649 1,293,159 2,608,562
Operating segment | Other        
Segment information        
Sales 3,189 3,412 10,817 11,789
Inter-Segment        
Segment information        
Sales (206) (204) (635) (660)
Inter-Segment | Other        
Segment information        
Sales 206 204 635 660
Contract Drilling:        
Segment information        
Sales 363,503 658,237 1,282,342 2,596,773
Segment Operating Income (Loss) 22,895 155,417 143,036 760,247
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 22,895 155,417 143,036 760,247
Contract Drilling: | U.S. Land        
Segment information        
Sales 285,028 494,615 1,004,116 2,103,125
Segment Operating Income (Loss) 25,802 121,734 143,855 664,722
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 25,802 121,734 143,855 664,722
Contract Drilling: | Offshore        
Segment information        
Sales 30,492 57,071 106,697 189,386
Segment Operating Income (Loss) 2,084 14,684 13,105 55,386
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income 2,084 14,684 13,105 55,386
Contract Drilling: | International Land        
Segment information        
Sales 47,983 106,551 171,529 304,262
Segment Operating Income (Loss) (4,991) 18,999 (13,924) 40,139
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (4,991) 18,999 (13,924) 40,139
Contract Drilling: | Operating segment        
Segment information        
Sales 363,503 658,237 1,282,342 2,596,773
Contract Drilling: | Operating segment | U.S. Land        
Segment information        
Sales 285,028 494,615 1,004,116 2,103,125
Contract Drilling: | Operating segment | Offshore        
Segment information        
Sales 30,492 57,071 106,697 189,386
Contract Drilling: | Operating segment | International Land        
Segment information        
Sales $ 47,983 $ 106,551 $ 171,529 $ 304,262