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Segment Information - Income by Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment information        
Operating revenue $ 498,564 $ 366,486 $ 1,272,437 $ 1,292,524
Segment Operating Income (Loss) 834 20,709 (82,543) 138,197
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (loss) 834 20,709 (82,543) 138,197
Income from asset sales 1,862 547 17,593 7,820
Corporate general and administrative costs and corporate depreciation (30,724) (34,512) (77,914) (78,982)
Operating income (loss) from continuing operations (28,028) (13,256) (142,864) 67,035
Other income (expense):        
Interest and dividend income 1,700 778 4,028 2,310
Interest expense (6,364) (6,407) (17,503) (16,652)
Other (911) 534 (350) 926
Total other income (expense) (5,575) (5,095) (13,825) (13,416)
Income (loss) from continuing operations before income taxes (33,603) (18,351) (156,689) 53,619
Other        
Segment information        
Operating revenue 4,262 2,983 10,697 10,182
Segment Operating Income (Loss) (2,569) (2,186) (5,752) (4,839)
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (loss) (2,569) (2,186) (5,752) (4,839)
Operating segment        
Segment information        
Operating revenue 498,786 366,692 1,273,075 1,293,159
Operating segment | Other        
Segment information        
Operating revenue 4,484 3,189 11,335 10,817
Inter-Segment        
Segment information        
Operating revenue (222) (206) (638) (635)
Inter-Segment | Other        
Segment information        
Operating revenue 222 206 638 635
Contract Drilling:        
Segment information        
Operating revenue 494,302 363,503 1,261,740 1,282,342
Segment Operating Income (Loss) 3,403 22,895 (76,791) 143,036
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (loss) 3,403 22,895 (76,791) 143,036
Contract Drilling: | U.S. Land        
Segment information        
Operating revenue 405,516 285,028 1,000,119 1,004,116
Segment Operating Income (Loss) (7,980) 25,802 (90,718) 143,855
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (loss) (7,980) 25,802 (90,718) 143,855
Contract Drilling: | Offshore        
Segment information        
Operating revenue 33,711 30,492 103,758 106,697
Segment Operating Income (Loss) 6,456 2,084 19,152 13,105
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (loss) 6,456 2,084 19,152 13,105
Contract Drilling: | International Land        
Segment information        
Operating revenue 55,075 47,983 157,863 171,529
Segment Operating Income (Loss) 4,927 (4,991) (5,225) (13,924)
Reconciliation of segment operating income to income from continuing operations before income taxes        
Segment operating income (loss) 4,927 (4,991) (5,225) (13,924)
Contract Drilling: | Operating segment        
Segment information        
Operating revenue 494,302 363,503 1,261,740 1,282,342
Contract Drilling: | Operating segment | U.S. Land        
Segment information        
Operating revenue 405,516 285,028 1,000,119 1,004,116
Contract Drilling: | Operating segment | Offshore        
Segment information        
Operating revenue 33,711 30,492 103,758 106,697
Contract Drilling: | Operating segment | International Land        
Segment information        
Operating revenue $ 55,075 $ 47,983 $ 157,863 $ 171,529