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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 3,746,013 | $ 2,756,607 | $ 2,872,421
Depreciation and amortization | 625,085 | 397,344 | 382,314
Selling, general and administrative | 287,052 | 244,883 | 206,687
Acquisition transaction costs | 54,702 | 14,982 | 0
Asset impairment charges | 194,030 | 0 | 12,097
OPERATING INCOME | 3,318 | 457,449 | 568,308
Intersegment revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (5,614) | 0 | 0
OPERATING INCOME | (3,999) | 1,261 | 4,671
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 3,679,533 | 2,746,128 | 2,862,553
Direct operating expenses | 2,471,654 | 1,618,172 | 1,725,102
Depreciation and amortization | 603,091 | 384,839 | 369,213
Research and development | 34,140 | 41,293 | 30,507
Selling, general and administrative | 89,898 | 74,134 | 71,833
Acquisition transaction costs | 4,597 |  |
Asset impairment charges | 134,227 |  | 12,097
Restructuring charges | 9,332 |  |
OPERATING INCOME | 338,208 | 627,690 | 653,801
All other revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 163,687 | 71,630 | 77,296
OPERATING INCOME | (103,397) | (1,359) | 15,876
Operating Segments Excluding Intersegment Elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 3,685,147 | 2,746,128 | 2,862,553
OPERATING INCOME | 230,812 | 627,592 | 674,348
Eliminations and Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (102,821) | (61,151) | (67,428)
North America Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Direct operating expenses | 1,322,697 | 1,366,471 | 1,447,522
Depreciation and amortization | 351,813 | 366,446 | 353,976
Research and development | 34,140 | 41,293 | 30,507
Selling, general and administrative | 68,047 | 61,113 | 58,397
Acquisition transaction costs | 41 |  |
Asset impairment charges | 1,507 |  | 3,948
Restructuring charges | 4,121 |  |
North America Solutions | Intersegment revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (1,039) | 0 | 0
North America Solutions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 2,361,288 | 2,445,946 | 2,519,743
OPERATING INCOME | 579,961 | 610,623 | 625,393
North America Solutions | Operating Segments Excluding Intersegment Elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 2,362,327 | 2,445,946 | 2,519,743
International Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Direct operating expenses | 718,822 | 169,033 | 180,797
Depreciation and amortization | 218,817 | 10,863 | 7,615
Research and development | 0 | 0 | 0
Selling, general and administrative | 17,232 | 9,427 | 10,401
Acquisition transaction costs | 1,585 |  |
Asset impairment charges | 132,720 |  | 8,149
Restructuring charges | 4,945 |  |
International Solutions | Intersegment revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (4,575) | 0 | 0
International Solutions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 797,851 | 193,975 | 212,566
OPERATING INCOME | (291,695) | 4,652 | 5,604
International Solutions | Operating Segments Excluding Intersegment Elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 802,426 | 193,975 | 212,566
Offshore Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Direct operating expenses | 430,135 | 82,668 | 96,783
Depreciation and amortization | 32,461 | 7,530 | 7,622
Research and development | 0 | 0 | 0
Selling, general and administrative | 4,619 | 3,594 | 3,035
Acquisition transaction costs | 2,971 |  |
Asset impairment charges | 0 |  | 0
Restructuring charges | 266 |  |
Offshore Solutions | Intersegment revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Offshore Solutions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 520,394 | 106,207 | 130,244
OPERATING INCOME | 49,942 | 12,415 | 22,804
Offshore Solutions | Operating Segments Excluding Intersegment Elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 520,394 | $ 106,207 | $ 130,244

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