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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 1,218,568 | $ 1,773,927 | $ 2,798,490
Segment operating income (loss) | (428,549) | (620,187) | 20,582
Depreciation and amortization | 419,726 | 481,885 | 562,803
Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (35,416) | (36,901) | 0
Segment operating income (loss) | (1,580) |  |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,218,568 | 1,773,927 | 2,798,490
Segment operating income (loss) | (303,494) | (544,389) | 109,233
Depreciation and amortization | 406,411 | 468,492 | 551,465
North America Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,026,364 | 1,474,380 | 2,426,191
North America Solutions | Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 0 | 0 | 0
North America Solutions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,026,364 | 1,474,380 | 2,426,191
Segment operating income (loss) | (287,176) | (393,902) | 80,898
Depreciation and amortization | 392,415 | 438,039 | 504,466
Offshore Gulf of Mexico |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 126,399 | 143,149 | 147,635
Offshore Gulf of Mexico | Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 0 | 0 | 0
Offshore Gulf of Mexico | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 126,399 | 143,149 | 147,635
Segment operating income (loss) | 15,969 | 7,478 | 19,594
Depreciation and amortization | 10,557 | 11,681 | 10,010
International Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 57,917 | 144,185 | 211,731
International Solutions | Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 0 | 0 | 0
International Solutions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 57,917 | 144,185 | 211,731
Segment operating income (loss) | (21,003) | (162,368) | 5,366
Depreciation and amortization | 2,013 | 17,531 | 35,466
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 7,888 | 12,213 | 12,933
Other | Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (35,416) | (36,901) | 0
Other | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 43,304 | 49,114 | 12,933
Segment operating income (loss) | (9,704) | 4,403 | 3,375
Depreciation and amortization | $ 1,426 | $ 1,241 | $ 1,523

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