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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Segment Performance (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 208,267 | $ 317,364 | $ 633,639 | $ 614,657 | $ 649,050 | $ 687,974 | $ 720,868 | $ 740,598 | $ 1,773,927 | $ 2,798,490 | $ 2,487,268
Segment operating income (loss) | $ (75,430) | $ (57,584) | $ (518,541) | $ 31,368 | $ 39,021 | $ (167,874) | $ 95,146 | $ 54,289 | (620,187) | 20,582 | 32,964
Depreciation and amortization |  |  |  |  |  |  |  |  | 481,885 | 562,803 | 583,802
Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (36,901) | 0 | 0
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,773,927 | 2,798,490 | 2,487,268
Segment operating income (loss) |  |  |  |  |  |  |  |  | (544,389) | 109,233 | 140,021
Depreciation and amortization |  |  |  |  |  |  |  |  | 468,492 | 551,465 | 570,662
North America Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,474,380 | 2,426,191 | 2,093,601
North America Solutions | Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
North America Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,474,380 | 2,426,191 | 2,093,601
Segment operating income (loss) |  |  |  |  |  |  |  |  | (393,902) | 80,898 | 108,697
Depreciation and amortization |  |  |  |  |  |  |  |  | 438,039 | 504,466 | 511,958
Offshore Gulf of Mexico |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 143,149 | 147,635 | 142,500
Offshore Gulf of Mexico | Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Offshore Gulf of Mexico | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 143,149 | 147,635 | 142,500
Segment operating income (loss) |  |  |  |  |  |  |  |  | 7,478 | 19,594 | 26,124
Depreciation and amortization |  |  |  |  |  |  |  |  | 11,681 | 10,010 | 10,392
International Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 144,185 | 211,731 | 238,356
International Solutions | Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
International Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 144,185 | 211,731 | 238,356
Segment operating income (loss) |  |  |  |  |  |  |  |  | (162,368) | 5,366 | (683)
Depreciation and amortization |  |  |  |  |  |  |  |  | 17,531 | 35,466 | 46,826
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 12,213 | 12,933 | 12,811
Other | Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 36,901 | 0 | 0
Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 49,114 | 12,933 | 12,811
Segment operating income (loss) |  |  |  |  |  |  |  |  | 4,403 | 3,375 | 5,883
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 1,241 | $ 1,523 | $ 1,486

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