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SEGMENT INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales | $ 566,110 | $ 659,694 | $ 883,052 | $ 1,056,585 | $ 985,038 | $ 952,087 | $ 893,430 | $ 889,152 | $ 3,165,441 | $ 3,719,707 | $ 3,387,614
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | 752,263 | 1,122,913 | 1,021,648
Depreciation |  |  |  |  |  |  |  |  | 606,992 | 523,549 | 455,623
Total assets | 7,143,915 |  |  |  | 6,713,792 |  |  |  | 7,143,915 | 6,713,792 | 6,259,859
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 1,035,278 | 1,047,176 | 791,741
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 752,263 | 1,122,913 | 1,021,648
Income from asset sales |  |  |  |  |  |  |  |  | 11,716 | 19,585 | 18,923
Corporate general and administrative costs and corporate depreciation |  |  |  |  |  |  |  |  | (88,229) | (87,711) | (83,910)
Operating income from continuing operations | (16,021) | $ 132,780 | $ 227,172 | $ 331,819 | 263,502 | $ 271,912 | $ 255,342 | $ 264,031 | 675,750 | 1,054,787 | 956,661
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income |  |  |  |  |  |  |  |  | 5,834 | 1,583 | 1,653
Interest expense |  |  |  |  |  |  |  |  | (15,036) | (4,654) | (6,129)
Gain on sale of investment securities |  |  |  |  |  |  |  |  |  | 45,234 | 162,121
Other |  |  |  |  |  |  |  |  | (901) | (636) | (9)
Total other income (expense) |  |  |  |  |  |  |  |  | (10,103) | 41,527 | 157,636
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 665,647 | 1,096,314 | 1,114,297
Other |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 14,187 | 13,410 | 13,461
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | (10,911) | (9,068) | (8,602)
Depreciation |  |  |  |  |  |  |  |  | 19,096 | 15,383 | 14,785
Total assets | 1,012,634 |  |  |  | 726,776 |  |  |  | 1,012,634 | 726,776 | 881,436
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 27,518 | 27,117 | 9,872
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | (10,911) | (9,068) | (8,602)
Operating segment |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 3,166,321 | 3,720,574 | 3,388,472
Operating segment | Other |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 15,067 | 14,277 | 14,319
Inter-Segment |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (880) | (867) | (858)
Inter-Segment | Other |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 880 | 867 | 858
Contract Drilling: |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 3,151,254 | 3,706,297 | 3,374,153
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | 763,174 | 1,131,981 | 1,030,250
Depreciation |  |  |  |  |  |  |  |  | 587,896 | 508,166 | 440,838
Total assets | 6,131,281 |  |  |  | 5,987,016 |  |  |  | 6,131,281 | 5,987,016 | 5,378,423
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 1,007,760 | 1,020,059 | 781,869
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 763,174 | 1,131,981 | 1,030,250
Contract Drilling: | U.S. Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,523,518 | 3,099,954 | 2,785,449
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | 698,375 | 1,025,745 | 932,591
Depreciation |  |  |  |  |  |  |  |  | 519,950 | 455,934 | 391,072
Total assets | 5,430,533 |  |  |  | 5,259,947 |  |  |  | 5,430,533 | 5,259,947 | 4,742,381
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 949,978 | 930,263 | 726,206
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 698,375 | 1,025,745 | 932,591
Contract Drilling: | Offshore |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 241,043 | 250,811 | 221,863
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | 67,729 | 69,819 | 53,064
Depreciation |  |  |  |  |  |  |  |  | 11,659 | 12,300 | 13,766
Total assets | 117,684 |  |  |  | 137,101 |  |  |  | 117,684 | 137,101 | 149,128
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 16,100 | 4,372 | 4,470
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 67,729 | 69,819 | 53,064
Contract Drilling: | International Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 386,693 | 355,532 | 366,841
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | (2,930) | 36,417 | 44,595
Depreciation |  |  |  |  |  |  |  |  | 56,287 | 39,932 | 36,000
Total assets | $ 583,064 |  |  |  | $ 589,968 |  |  |  | 583,064 | 589,968 | 486,914
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 41,682 | 85,424 | 51,193
Reconciliation of segment operating income to income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | (2,930) | 36,417 | 44,595
Contract Drilling: | Operating segment |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 3,151,254 | 3,706,297 | 3,374,153
Contract Drilling: | Operating segment | U.S. Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,523,518 | 3,099,954 | 2,785,449
Contract Drilling: | Operating segment | Offshore |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 241,043 | 250,811 | 221,863
Contract Drilling: | Operating segment | International Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 386,693 | $ 355,532 | $ 366,841

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