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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, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 2,058,944 | $ 1,218,568 | $ 1,773,927
Segment operating income (loss) | 45,292 | (428,549) | (620,187)
Depreciation and amortization | 403,170 | 419,726 | 481,885
Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (57,047) | (35,416) | (36,901)
Segment operating income (loss) | (6,422) | (1,580) |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 2,058,944 | 1,218,568 | 1,773,927
Segment operating income (loss) | 151,267 | (303,494) | (544,389)
Depreciation and amortization | 390,282 | 406,411 | 468,492
North America Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,788,167 | 1,026,364 | 1,474,380
North America Solutions | Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 0 | 0 | 0
North America Solutions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,788,167 | 1,026,364 | 1,474,380
Segment operating income (loss) | 121,893 | (287,176) | (393,902)
Depreciation and amortization | 375,250 | 392,415 | 438,039
Offshore Gulf of Mexico |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 125,465 | 126,399 | 143,149
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 | 125,465 | 126,399 | 143,149
Segment operating income (loss) | 23,214 | 15,969 | 7,478
Depreciation and amortization | 9,175 | 10,557 | 11,681
International Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 136,072 | 57,917 | 144,185
International Solutions | Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 0 | 0 | 0
International Solutions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 136,072 | 57,917 | 144,185
Segment operating income (loss) | (138) | (21,003) | (162,368)
Depreciation and amortization | 4,156 | 2,013 | 17,531
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 9,240 | 7,888 | 12,213
Other | Intersegment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (57,047) | (35,416) | (36,901)
Other | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 66,287 | 43,304 | 49,114
Segment operating income (loss) | 12,720 | (9,704) | 4,403
Depreciation and amortization | $ 1,701 | $ 1,426 | $ 1,241

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