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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

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