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SEGMENT INFORMATION - Reportable segment information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales | $ 331,708 | $ 366,486 | $ 438,191 | $ 487,847 | $ 553,800 | $ 661,445 | $ 885,670 | $ 1,060,787 | $ 1,624,232 | $ 3,161,702 | $ 3,715,968
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | 68,200 | 748,373 | 1,121,791
Depreciation |  |  |  |  |  |  |  |  | 598,587 | 608,039 | 523,984
Total assets | 6,831,955 |  |  |  | 7,139,145 |  |  |  | 6,831,955 | 7,139,145 | 6,718,110
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 241,290 | 1,033,241 | 1,045,820
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 68,200 | 748,373 | 1,121,791
Income from asset sales |  |  |  |  |  |  |  |  | 9,896 | 11,834 | 19,083
Corporate general and administrative costs and corporate depreciation |  |  |  |  |  |  |  |  | (104,062) | (88,244) | (87,700)
Operating income (loss) from continuing operations | (93,001) | $ (13,256) | $ 41,621 | $ 38,670 | (24,783) | $ 135,049 | $ 231,326 | $ 330,371 | (25,966) | 671,963 | 1,053,174
Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income |  |  |  |  |  |  |  |  | 3,166 | 5,840 | 1,543
Interest expense |  |  |  |  |  |  |  |  | (22,913) | (15,023) | (4,657)
Gain (loss) on investment securities |  |  |  |  |  |  |  |  | (25,989) |  | 45,234
Other |  |  |  |  |  |  |  |  | (965) | (901) | (636)
Total other income (expense) |  |  |  |  |  |  |  |  | (46,701) | (10,084) | 41,484
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | (72,667) | 661,879 | 1,094,658
Other |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 13,275 | 14,187 | 13,410
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | (7,491) | (10,911) | (9,068)
Depreciation |  |  |  |  |  |  |  |  | 20,753 | 19,096 | 15,383
Total assets | 1,234,323 |  |  |  | 1,025,402 |  |  |  | 1,234,323 | 1,025,402 | 726,174
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 20,076 | 27,518 | 27,117
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | (7,491) | (10,911) | (9,068)
Operating segment |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,625,087 | 3,162,582 | 3,716,835
Operating segment | Other |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 14,130 | 15,067 | 14,277
Inter-Segment |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (855) | (880) | (867)
Inter-Segment | Other |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 855 | 880 | 867
Contract Drilling: |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,610,957 | 3,147,515 | 3,702,558
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | 75,691 | 759,284 | 1,130,859
Depreciation |  |  |  |  |  |  |  |  | 577,834 | 588,943 | 508,601
Total assets | 5,597,632 |  |  |  | 6,113,743 |  |  |  | 5,597,632 | 6,113,743 | 5,991,936
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 221,214 | 1,005,723 | 1,018,703
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 75,691 | 759,284 | 1,130,859
Contract Drilling: | U.S. Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,242,462 | 2,523,518 | 3,099,954
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | 74,118 | 698,375 | 1,025,745
Depreciation |  |  |  |  |  |  |  |  | 508,237 | 519,950 | 455,934
Total assets | 5,005,299 |  |  |  | 5,429,179 |  |  |  | 5,005,299 | 5,429,179 | 5,261,361
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 209,156 | 949,978 | 930,263
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 74,118 | 698,375 | 1,025,745
Contract Drilling: | Offshore |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 138,601 | 241,666 | 251,341
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | 15,659 | 68,002 | 69,969
Depreciation |  |  |  |  |  |  |  |  | 12,495 | 11,659 | 12,300
Total assets | 105,152 |  |  |  | 118,852 |  |  |  | 105,152 | 118,852 | 137,104
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 9,694 | 16,100 | 4,372
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 15,659 | 68,002 | 69,969
Contract Drilling: | International Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 229,894 | 382,331 | 351,263
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | (14,086) | (7,093) | 35,145
Depreciation |  |  |  |  |  |  |  |  | 57,102 | 57,334 | 40,367
Total assets | $ 487,181 |  |  |  | $ 565,712 |  |  |  | 487,181 | 565,712 | 593,471
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 2,364 | 39,645 | 84,068
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | (14,086) | (7,093) | 35,145
Contract Drilling: | Operating segment |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,610,957 | 3,147,515 | 3,702,558
Contract Drilling: | Operating segment | U.S. Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,242,462 | 2,523,518 | 3,099,954
Contract Drilling: | Operating segment | Offshore |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 138,601 | 241,666 | 251,341
Contract Drilling: | Operating segment | International Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 229,894 | $ 382,331 | $ 351,263

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