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SEGMENT INFORMATION - Income by Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Segment information                      
Operating revenue $ 532,304 $ 498,564 $ 405,283 $ 368,590 $ 331,708 $ 366,486 $ 438,191 $ 487,847 $ 1,804,741 $ 1,624,232 $ 3,161,702
Segment Operating Income (Loss)                 (87,352) 68,200 748,373
Depreciation and amortization                 585,543 598,587 608,039
Segment Assets 6,439,985       6,831,955       6,439,985 6,831,955 7,139,145
Additions to Long-Lived Assets                 408,106 241,290 1,033,241
Reconciliation of segment operating income to income from continuing operations before income taxes                      
Segment operating income (loss)                 (87,352) 68,200 748,373
Income from asset sales                 20,627 9,896 11,834
Corporate general and administrative costs and corporate depreciation                 (105,816) (104,062) (88,244)
Operating income (loss) from continuing operations (29,677) $ (28,028) $ (65,672) $ (49,164) (93,001) $ (13,256) $ 41,621 $ 38,670 (172,541) (25,966) 671,963
Other income (expense):                      
Interest and dividend income                 5,915 3,166 5,840
Interest expense                 (19,747) (22,913) (15,023)
Loss on investment securities                   (25,989)  
Other                 1,775 (965) (901)
Total other income (expense)                 (12,057) (46,701) (10,084)
Income (loss) from continuing operations before income taxes                 (184,598) (72,667) 661,879
Other                      
Segment information                      
Operating revenue                 15,983 13,275 14,187
Segment Operating Income (Loss)                 (9,449) (7,491) (10,911)
Depreciation and amortization                 20,671 20,753 19,096
Segment Assets 959,986       1,234,323       959,986 1,234,323 1,025,402
Additions to Long-Lived Assets                 7,351 20,076 27,518
Reconciliation of segment operating income to income from continuing operations before income taxes                      
Segment operating income (loss)                 (9,449) (7,491) (10,911)
Operating segment                      
Segment information                      
Operating revenue                 1,805,603 1,625,087 3,162,582
Operating segment | Other                      
Segment information                      
Operating revenue                 16,845 14,130 15,067
Inter-Segment                      
Segment information                      
Operating revenue                 (862) (855) (880)
Inter-Segment | Other                      
Segment information                      
Operating revenue                 862 855 880
Contract Drilling:                      
Segment information                      
Operating revenue                 1,788,758 1,610,957 3,147,515
Segment Operating Income (Loss)                 (77,903) 75,691 759,284
Depreciation and amortization                 564,872 577,834 588,943
Segment Assets 5,479,999       5,597,632       5,479,999 5,597,632 6,113,743
Additions to Long-Lived Assets                 400,755 221,214 1,005,723
Reconciliation of segment operating income to income from continuing operations before income taxes                      
Segment operating income (loss)                 (77,903) 75,691 759,284
Contract Drilling: | U.S. Land                      
Segment information                      
Operating revenue                 1,439,523 1,242,462 2,523,518
Segment Operating Income (Loss)                 (94,880) 74,118 698,375
Depreciation and amortization                 499,486 508,237 519,950
Segment Assets 4,967,074       5,005,299       4,967,074 5,005,299 5,429,179
Additions to Long-Lived Assets                 394,508 209,156 949,978
Reconciliation of segment operating income to income from continuing operations before income taxes                      
Segment operating income (loss)                 (94,880) 74,118 698,375
Contract Drilling: | Offshore                      
Segment information                      
Operating revenue                 136,263 138,601 241,666
Segment Operating Income (Loss)                 24,201 15,659 68,002
Depreciation and amortization                 11,764 12,495 11,659
Segment Assets 99,533       105,152       99,533 105,152 118,852
Additions to Long-Lived Assets                 2,847 9,694 16,100
Reconciliation of segment operating income to income from continuing operations before income taxes                      
Segment operating income (loss)                 24,201 15,659 68,002
Contract Drilling: | International Land                      
Segment information                      
Operating revenue                 212,972 229,894 382,331
Segment Operating Income (Loss)                 (7,224) (14,086) (7,093)
Depreciation and amortization                 53,622 57,102 57,334
Segment Assets $ 413,392       $ 487,181       413,392 487,181 565,712
Additions to Long-Lived Assets                 3,400 2,364 39,645
Reconciliation of segment operating income to income from continuing operations before income taxes                      
Segment operating income (loss)                 (7,224) (14,086) (7,093)
Contract Drilling: | Operating segment                      
Segment information                      
Operating revenue                 1,788,758 1,610,957 3,147,515
Contract Drilling: | Operating segment | U.S. Land                      
Segment information                      
Operating revenue                 1,439,523 1,242,462 2,523,518
Contract Drilling: | Operating segment | Offshore                      
Segment information                      
Operating revenue                 136,263 138,601 241,666
Contract Drilling: | Operating segment | International Land                      
Segment information                      
Operating revenue                 $ 212,972 $ 229,894 $ 382,331