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BUSINESS SEGMENT AND GEOGRAPHIC INFORMATION - Income by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales | $ 696,825 | $ 648,872 | $ 577,484 | $ 564,087 | $ 532,304 | $ 498,564 | $ 405,283 | $ 368,590 | $ 2,487,268 | $ 1,804,741 | $ 1,624,232
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | 148,349 | (87,352) | 68,200
Depreciation |  |  |  |  |  |  |  |  | 583,802 | 585,543 | 598,587
Total Assets | 6,214,867 |  |  |  | 6,439,985 |  |  |  | 6,214,867 | 6,439,985 | 6,831,955
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 468,830 | 408,106 | 241,290
U.S. Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | 2,069,384 | 1,439,523 | 1,242,462
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | 150,698 | (94,880) | 74,118
Depreciation |  |  |  |  |  |  |  |  | 505,112 | 499,486 | 508,237
Total Assets | 5,012,378 |  |  |  | 4,967,074 |  |  |  | 5,012,378 | 4,967,074 | 5,005,299
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 441,624 | 394,508 | 209,156
Offshore |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | 142,500 | 136,263 | 138,601
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | 26,124 | 24,201 | 15,659
Depreciation |  |  |  |  |  |  |  |  | 10,392 | 11,764 | 12,495
Total Assets | 105,439 |  |  |  | 99,533 |  |  |  | 105,439 | 99,533 | 105,152
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 4,326 | 2,847 | 9,694
International Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | 238,356 | 212,972 | 229,894
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | (683) | (7,224) | (14,086)
Depreciation |  |  |  |  |  |  |  |  | 46,826 | 53,622 | 57,102
Total Assets | 362,033 |  |  |  | 413,392 |  |  |  | 362,033 | 413,392 | 487,181
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 4,424 | 3,400 | 2,364
Other |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | 39,243 | 16,845 | 14,130
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  | (27,790) | (9,449) | (7,491)
Depreciation |  |  |  |  |  |  |  |  | 21,472 | 20,671 | 20,753
Total Assets | $ 735,017 |  |  |  | $ 959,986 |  |  |  | 735,017 | 959,986 | 1,234,323
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 18,456 | 7,351 | 20,076
Operating segment |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | 2,487,268 | 1,804,741 | 1,624,232
Operating segment | U.S. Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | 2,068,195 | 1,439,523 | 1,242,462
Operating segment | Offshore |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | 142,500 | 136,263 | 138,601
Operating segment | International Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | 238,356 | 212,972 | 229,894
Operating segment | Other |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | 38,217 | 15,983 | 13,275
Inter-Segment |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | (2,215) | (862) | (855)
Inter-Segment | U.S. Land |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | 1,189 |  |
Inter-Segment | Other |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total Sales |  |  |  |  |  |  |  |  | $ 1,026 | $ 862 | $ 855

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